CVE-2026-49222

Executive Summary

CVE-2026-49222 is an authorization bypass vulnerability (CWE-639 — Authorization Bypass Through User-Controlled Key) in Vvveb CMS versions prior to 1.0.8.4. The flaw resides in the backend product question management module, where a low-privileged Vendor account can manipulate question records (read, modify, delete, change status) that belong to other Vendors' products. The vulnerability carries a CVSS score of 7.6 (High), driven primarily by high integrity impact, and is exploitable over the network by an authenticated low-privilege user without user interaction. No public exploit, proof-of-concept, or Nuclei template is currently available, and the vendor has not released a patch beyond the advisory indicating version 1.0.8.4 resolves the issue. Given CISA KEV status is NO and EPSS is unscored, this vulnerability currently poses a targeted risk primarily to multi-vendor Vvveb deployments where tenant isolation is critical.

Technical Analysis

The vulnerability class is CWE-639 — Authorization Bypass Through User-Controlled Key. This occurs when an application uses a user-supplied identifier to directly access an object without verifying that the authenticated user has permission to access that specific object. In this case, Vvveb's backend product question operations fail to enforce object-level authorization.

Per the NVD description, the relevant database schema is defined in admin/sql/sqlite/product_question.sql. The queries executed against this table accept a caller-controlled product_question_id parameter. Critically, the application does not join or validate product_question.product_id against product.admin_id for the currently authenticated admin_id. This means a Vendor who authenticates with their own credentials can supply an arbitrary product_question_id belonging to another Vendor's product and perform operations as if they were the owner.

The attack surface is the Vvveb administrative backend, specifically the product question management endpoints. Since the application runs a CMS with e-commerce support, these endpoints are likely accessible via a web interface and/or REST-style API called by the page builder/admin panel. The vulnerability is network-exploitable (AV:N), requires low privileges (PR:L — a Vendor account), and requires no user interaction (UI:N).

The affected logic likely spans multiple operations: reading pending question content and moderation data, changing question status (e.g., approving or hiding), editing question content, and deleting questions entirely. Each of these operations suffers from the same missing authorization check. The integrity impact is high (I:H) because an attacker can manipulate public-facing Q&A content, delete legitimate questions, or approve malicious questions — directly affecting storefront content integrity. The confidentiality impact is low (C:L) because an attacker can read pending question content and internal moderation flags. The availability impact is low (A:L) since deletion of questions may degrade content availability on product pages.

No specific function names, HTTP endpoints, or parameter formats are provided beyond product_question_id, product_question, product_id, and admin_id — all of which appear in the NVD description. The application is SQLite-backed per the SQL file path, suggesting the queries are parameterized SQL statements, though this does not preclude injection; however, the CWE assigned is authorization bypass (639), not SQL injection (89).

Exploitation Scenarios

The attack chain for CVE-2026-49222 is inferred from the vulnerability class and NVD description. No public PoC exists, and specific endpoint details are unavailable; the chain is described at the vulnerability-class level.

Step 1 — Reconnaissance and Target Identification: An attacker first identifies a Vvveb instance. Shodan queries such as http.title:"Vvveb" can locate exposed instances. The attacker then needs valid low-privilege credentials — a Vendor account. These can be obtained through credential stuffing, weak password guessing, or social engineering. The attacker logs into the admin backend.

Step 2 — Triggering the Authorization Bypass: The attacker navigates to the product question management module. By enumerating product_question_id values (sequential IDs are common in SQLite auto-increment columns), the attacker can identify question records belonging to other Vendors' products. The application processes the request using the supplied product_question_id without verifying that the associated product_id is owned by the authenticated admin_id. This is the core authorization failure.

Step 3 — Payload / Execution Method: The attack is a simple crafted HTTP request to the question management endpoint with a tampered product_question_id. For example, an attacker who owns product 10 can request operations on question IDs 100, 101, 102, etc., which belong to product 20 owned by another Vendor. The request may be a GET (to read) or POST/DELETE (to modify/delete). The exact parameter encoding and endpoint path are not specified in the description and must not be fabricated. At the class level: the application trusts the user-supplied key for object lookup without an ownership check.

Step 4 — Post-Exploitation Impact: Once access is gained, the attacker can:

• Read pending question content from other Vendors' products, exposing customer data, order references, or trade-sensitive information (confidentiality impact).
• Change question status (approve/reject/hide), manipulating which customer questions appear publicly on competitor product pages (integrity impact).
• Edit question content to inject malicious links, misinformation, or phishing content visible to all storefront visitors (integrity impact, potential secondary attacks).
• Delete questions, removing legitimate customer feedback and disrupting Q&A visibility for other Vendors (availability impact).

In a multi-tenant deployment where Vvveb hosts multiple Vendors, this vulnerability allows a low-privilege user to undermine the integrity of other tenants' e-commerce storefronts. The impact is confined to the product Q&A feature but reaches public-facing content.

Impact Assessment

CVSS Breakdown (derived from vector): Base Score 7.6 (High). Attack Vector: Network (AV:N) — exploitable remotely. Attack Complexity: Low (AC:L) — no special conditions. Privileges Required: Low (PR:L) — attacker needs a Vendor account. User Interaction: None (UI:N). Scope: Unchanged (S:U) — the compromise is contained to the affected component. Confidentiality: Low (C:L) — read access to question content and moderation metadata. Integrity: High (I:H) — ability to alter or delete question content, change moderation status. Availability: Low (A:L) — deletion of questions impacts content availability.

Business Impact:

• Trust and Brand Damage: Manipulated Q&A content on e-commerce product pages can mislead customers, erode brand trust for the affected Vendor, and potentially drive away sales.
• Data Exposure: Pending questions may contain customer PII (names, emails, order numbers) if the storefront collects such data into the question form; this constitutes a data confidentiality breach.
• Competitive Abuse: A malicious Vendor can sabotage competitors' product pages by deleting positive reviews/questions or approving negative/defamatory content.
• Regulatory Risk: If customer PII is exposed across tenant boundaries, GDPR/CCPA obligations may be triggered, requiring breach notification.

Affected Systems: All Vvveb installations running versions prior to 1.0.8.4 with the product question feature enabled. Notably, the plugin-data suggests SQLite storage; the flaw affects any backend using the referenced SQL schema.

Blast Radius: The vulnerability is scoped to the product question module but touches public-facing content. In multi-Vendor deployments, the blast radius spans all Vendors whose questions are stored in the shared database. There is no evidence of CVSS scope change (S:U), meaning the attack cannot directly pivot to the host OS or other application modules, but the integrity of storefront content is globally affected.

Exploitation Likelihood: With no public PoC, no metasploit module, and no exploit code available, the in-the-wild exploitation likelihood is currently LOW. However, the attack is trivially simple once the backend endpoint is identified, and enumeration of sequential product_question_id values requires minimal skill. The absence of a published patch (beyond the advisory) increases long-term risk if instances remain un-upgraded.

Detection Guidance

Sigma Rule

title: Vvveb Product Question Authorization Bypass
id: 6f8b3c2a-9d41-4b7e-8f21-2c4a6e8d0f12
status: experimental
description: Detects attempts to access or modify product questions belonging to another vendor in Vvveb CMS
author: valtersit.com Threat Intel
date: 2026/01/15
logsource:
  category: application
  product: vvveb
detection:
  selection:
    event.action: 
      - "question_view"
      - "question_edit"
      - "question_delete"
      - "question_status_change"
    event.user.role: "vendor"
  filter_known_access:
    event.user.admin_id|equals: event.object.admin_id
  condition: selection and not filter_known_access
level: high
falsepositives:
  - Legitimate cross-vendor admin operations by super-admin (if any)
  - Misconfigured tenant ownership mapping
tags:
  - attack.t1190
  - cve.2026.49222
  - cwe.639

YARA Rule

rule vvveb_cve_2026_49222_authz_bypass
{
    meta:
        author = "valtersit.com Threat Intel"
        description = "Detects Vvveb source indicating missing authorization check in product_question operations"
        cve = "CVE-2026-49222"
        cwe = "CWE-639"
        date = "2026-01-15"
        severity = "high"
    strings:
        $s1 = "product_question_id" ascii nocase
        $s2 = "product_question" ascii nocase
        $s3 = "product_id" ascii nocase
        $s4 = "admin_id" ascii nocase
        $s5 = "admin/sql/sqlite/product_question.sql" ascii nocase
        $s6 = "question_status" ascii nocase
    condition:
        (uint16(0) == 0x5A4D or uint16(0) == 0x7F45) and  // PE or ELF (server binaries)
        (any of ($s*)) or
        ($s1 or $s2 or $s3 or $s4)
}

Note: YARA is most effective when scanning server-side application code (PHP, Python, compiled binaries) for the missing authorization pattern. File-level scanning for the SQL schema file or source files referencing product_question_id without ownership validation can flag vulnerable deployments.

Suricata IDS Rule

alert http any any -> $HOME_NET any (msg:"Vvveb CVE-2026-49222 Product Question Authorization Bypass - Parameter Enumeration"; flow:established,to_server; content:"product_question_id"; http_uri; pcre:"/product_question_id=\d+/Ui"; content:"admin"; http_uri; classtype:attempted-admin; sid:10049222; rev:1; metadata:cve CVE-2026-49222, cwe CWE-639, attack_tactic T1190;)

Note: This rule detects HTTP requests to admin endpoints containing the product_question_id parameter. High-volume legitimate admin traffic may cause false positives; tune by checking for sequential IDs or cross-vendor access patterns.

Elastic Detection

// EQL query to detect Vvveb vendor acting on foreign product questions
sequence by user.name, source.ip
  [any where process.name : "php*" or event.category : "web"]
  [any where event.action in ("question_view", "question_edit", "question_delete", "question_status_change")
     and event.outcome : "success"
     and user.roles : "*vendor*"]
  // This is a heuristic; for accuracy, application-level logging must include
  // originating admin_id and target product admin_id for differential analysis
  | where event.duration > 0

Note: EQL detection requires application-level logging of admin_id (requesting user) and product.admin_id (target owner). Without this differential data, the rule serves as a baseline for question-modification events from vendor accounts.

Splunk SPL Query

index=web sourcetype=vvveb_access
| where like(action, "%question%") 
| stats count by src_ip, user, action, http_status
| where http_status=200
| lookup vvveb_question_owners product_question_id as question_id OUTPUT product_owner_admin_id
| where user != product_owner_admin_id
| table _time, src_ip, user, action, question_id, product_owner_admin_id

Note: The vvveb_question_owners lookup must be built from the database mapping product_question_id to product.admin_id. Queries lacking this lookup will generate excessive false positives. This SPL assumes application logs contain the product_question_id and action fields, which require custom logging in the Vvveb admin module.

Wazuh OSSEC Rule

<group name="vvveb,">
  <rule id="100222" level="12">
    <decoded_as>json</decoded_as>
    <match>product_question_id</match>
    <regex>action:\s*(question_view|question_edit|question_delete|question_status_change)</regex>
    <regex>admin_id:\s*(\S+)</regex>
    <regex>product_admin_id:\s*(?!\1)\S+</regex>  <!-- mismatched owner -->
    <description>Vvveb: Vendor attempted cross-tenant product question operation (CVE-2026-49222)</description>
    <group>access_control,application,</group>
    <mitre>
      <id>T1190</id>
    </mitre>
    <cwe>CWE-639</cwe>
    <cve>CVE-2026-49222</cve>
  </rule>
</group>

Note: The Wazuh rule relies on structured JSON logs from Vvveb containing admin_id (requester) and product_admin_id (object owner). These fields are not part of standard Vvveb logging and must be instrumented. Without them, use a simpler rule matching question action from vendor role.

Mitigation & Patch Guidance

Patch Confidence: 0/4 — UNPATCHED — no patch evidence from any tracked source.

Despite the advisory's statement that version 1.0.8.4 fixes the issue, this intelligence report has no corroborating patch evidence (no commit, no release notes, no binary diff, no package update) from tracked sources. Treat this as UNPATCHED until version 1.0.8.4 or later is verified and deployed.

1. Immediate Mitigations (Compensating Controls):

• Upgrade immediately if possible: If version 1.0.8.4 is available in the vendor's release channel, upgrade all production instances. Treat the advisory as credible but verify post-upgrade that the authorization check is enforced.
• Restrict backend access: Place the admin panel behind a VPN or IP-allowlist at the firewall level. This limits the network attack surface (AV:N becomes AV:A or AV:L in practice).
• Disable product questions: If the Q&A feature is not business-critical, disable or remove the product question module entirely to eliminate the attack surface.
• Enforce MFA: Require multi-factor authentication for all Vendor accounts to reduce the likelihood of credential compromise and unauthorized login.
• Monitor question-modification events: Deploy the detection rules above. Closely monitor all question edit/delete/status-change operations for anomalies.

2. Patch/Upgrade Steps:

• Download Vvveb version 1.0.8.4 from the official vendor repository (verify checksums).
• Back up the application files and database (especially the product_question and product tables).
• Upgrade as per the vendor's installation guide.
• Post-upgrade test: as a Vendor account, attempt to access a product_question_id bound to a different Vendor's product. Verify the request is denied with an authorization error.
• Confirm the SQL queries in admin/sql/sqlite/product_question.sql now join against product.admin_id.

3. Long-Term Hardening:

• Implement object-level authorization middleware: In any future custom development, enforce a centralized authorization check that validates object ownership (e.g., comparing product.admin_id to session.admin_id) before executing any CRUD operation.
• Use unpredictable identifiers: Replace sequential integer product_question_id with UUIDs to frustrate enumeration attacks, though this is defense-in-depth, not a fix.
• Adopt the principle of least privilege: Review all Vendor roles and permissions. Ensure Vendors can only access their own tenant's data.
• Establish patching cadence: Monitor the vendor's release notes and subscribe to security advisories for Vvveb. Apply future patches within a defined SLA.
• Audit existing deployments: Conduct a review of question audit logs for signs of prior cross-vendor manipulation if the system has been in production for a long period.

References

1. NVD Entry — CVE-2026-49222 (Primary reference): https://nvd.nist.gov/vuln/detail/CVE-2026-49222
2. Vvveb Official Website & Release notes: https://www.vvveb.com/ (to verify version 1.0.8.4 availability and changelog)
3. MITRE ATT&CK — T1190: Exploit Public-Facing Application: https://attack.mitre.org/techniques/T1190/
4. CWE-639 — Authorization Bypass Through User-Controlled Key: https://cwe.mitre.org/data/definitions/639.html
5. CISA Known Exploited Vulnerabilities Catalog (CVE-2026-49222 NOT listed): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Threat actor campaigns / in-the-wild evidence: None reported as of this writing. CISA KEV status is NO. No public exploit code, Nuclei template, or Metasploit module has been identified. The vulnerability is not listed in OSV packages. Exploitation likelihood is currently low, but the simplicity of the flaw class warrants continued monitoring for public exploit disclosure.