CVE-2026-107866

Executive Summary

CVE-2026-107866 is a stored cross-site scripting (XSS) vulnerability in the JetElements For Elementor WordPress plugin by Crocoblock, affecting all versions through 2.9.2.3. The flaw arises from improper neutralization of user-supplied input during web page generation, allowing an authenticated attacker with low privileges to inject persistent JavaScript that executes in the browser of any user viewing the compromised page. Given the plugin's role in building dynamic Elementor-based sites, successful exploitation can lead to session hijacking, defacement, and privilege escalation within the WordPress context, with no vendor patch currently available.

Technical Analysis

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), specifically a stored (persistent) XSS. The affected component is the JetElements For Elementor plugin, which extends the Elementor page builder with additional widgets and dynamic content modules.

The mechanism follows the classic stored XSS pattern: an authenticated user with contributor-level or similar low privileges submits input through a plugin-exposed field or parameter that is persisted to the WordPress database (for example, within post meta, widget settings, or custom fields managed by JetElements). Because the plugin fails to properly sanitize or escape this input before rendering it into the generated HTML page, the malicious script is stored and later served to all visitors of the affected page — including administrators and other privileged users.

The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L indicates:

• AV:N — exploitable over the network (the attacker interacts with the web application remotely).
• AC:L — no special conditions beyond normal access are required.
• PR:L — the attacker needs low privileges, consistent with an authenticated WordPress user such as a contributor or author.
• UI:R — successful execution in a victim's browser requires that the victim visits the compromised page (user interaction).
• S:C — scope is changed, meaning the injected script can affect resources beyond the vulnerable component (e.g., the broader WordPress site or adjacent security domains).
• C:L/I:L/A:L — limited impact to confidentiality, integrity, and availability.

No code-level details, function names, or specific parameter identifiers are provided in the NVD description; therefore, the exact injection point cannot be confirmed from available intelligence. The vulnerability class and its general attack surface within the Elementor plugin ecosystem are well understood, but no implementation-specific claims should be made without further source review.

Exploitation Scenarios

No public PoC is available; the attack chain below is inferred from the stored XSS vulnerability class and the affected product context.

1. Reconnaissance and target identification — The attacker identifies WordPress sites running Elementor alongside the JetElements For Elementor plugin at version 2.9.2.3 or earlier. Fingerprinting can be performed by requesting plugin assets under the standard WordPress plugin path or by inspecting page markup for JetElements-specific widget output. Public search engines (e.g., Shodan dorks targeting http.html:"jet-elements") can enumerate candidate sites at scale.

2. Triggering the flaw — The attacker authenticates with a low-privileged account (contributor/author level) on the target WordPress instance. Through the plugin's content-authoring interface — any field or widget setting that JetElements persists and later renders without proper output encoding — the attacker submits a payload containing a malicious <script> tag or event-handler attribute. Because the input is not neutralized before storage, the payload is written to the database.

3. Payload execution — When any user (including an administrator) loads the page containing the injected content, the stored script executes in the context of the victim's browser session on the vulnerable site. At the vulnerability-class level, the payload could read cookies or authentication tokens, perform actions on behalf of the victim via the site's authenticated session, or display deceptive content.

4. Post-exploitation impact — A successful attack could allow session hijacking, administrative action forgery (e.g., creating a new admin user or modifying plugin/theme settings through the victim's session), content defacement, or redirection of visitors to attacker-controlled infrastructure. Given the scope change (S:C), the impact is not confined to the injected widget but can propagate across the application.

The attack is constrained by the requirement for an authenticated low-privilege account and by user interaction (the victim must view the infected page), which is reflected in the CVSS score of 6.5 (Medium).

Impact Assessment

The vulnerability carries a CVSS base score of 6.5 (Medium). The subscores show:

• Privileges Required (PR:L) — only low privileges are needed, reducing the barrier to entry for an authenticated attacker.
• User Interaction (UI:R) — exploitation requires a victim to visit the tainted page, making mass exploitation dependent on site traffic.
• Scope Change (S:C) — the injected script executes in a security context that may extend beyond the vulnerable plugin, potentially compromising the entire WordPress installation and its users.
• Limited CIA impact (C:L/I:L/A:L) — while individually limited, the combination in a persistent XSS context can be leveraged for significant downstream effects such as privilege escalation or persistent backdooring of the site.

The blast radius includes any WordPress site running JetElements For Elementor through 2.9.2.3 that allows low-privileged users to author content. Because Elementor is one of the most widely deployed page builders, the population of potentially exposed sites is substantial. Business impact includes reputational damage, loss of visitor trust, regulatory exposure if personal data is compromised via session theft, and potential full-site takeover if an administrator's session is hijacked.

Detection Guidance

Sigma Rule

title: Stored XSS Attempt via JetElements For Elementor Plugin
id: 9f3c2b41-7a6e-4d1c-9f4e-8b2d5c6a1e70
status: experimental
description: Detects injection of script tags or event handler attributes in requests targeting the JetElements For Elementor plugin (CVE-2026-107866).
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-107866
author: valtersit.com
date: 2026-01-01
tags:
  - attack.t1059.007
  - attack.t1190
logsource:
  category: webserver
detection:
  selection_endpoint:
    cs-uri-query|contains: 'jet-elements'
  selection_payload:
    cs-uri-query|contains:
      - '<script'
      - 'javascript:'
      - 'onerror='
      - 'onload='
  condition: selection_endpoint and selection_payload
falsepositives:
  - Legitimate content editors embedding scripts in trusted contexts
level: medium

YARA Rule

rule CVE_2026_107866_JetElements_XSS
{
    meta:
        description = "Detects stored XSS payloads targeting JetElements For Elementor (CVE-2026-107866)"
        author = "valtersit.com"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-107866"
        date = "2026-01-01"
    strings:
        $plugin = "jet-elements" nocase
        $tag1 = "<script" nocase
        $tag2 = "javascript:" nocase
        $tag3 = "onerror=" nocase
        $tag4 = "onload=" nocase
    condition:
        $plugin and any of ($tag*)
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-107866 JetElements For Elementor Stored XSS Attempt"; flow:established,to_server; http.uri; content:"jet-elements"; nocase; http.uri; content:"<script"; nocase; nocase; sid:2026107866; rev:1;)

Elastic Detection

network where http.request.uri contains "jet-elements" and
  (http.request.uri contains "<script" or
   http.request.uri contains "javascript:" or
   http.request.uri contains "onerror=" or
   http.request.uri contains "onload=")

Splunk SPL Query

index=web_logs sourcetype=access_combined
| search uri="*jet-elements*" (uri="*<script*" OR uri="*javascript:*" OR uri="*onerror=*" OR uri="*onload=*")
| stats count min(_time) as first_seen max(_time) as last_seen by src_ip, uri, status
| where count > 3
| sort - count

Wazuh OSSEC Rule

<group name="web,appsec,xss,">
  <rule id="100866" level="10">
    <decoded_as>web-accesslog</decoded_as>
    <match>jet-elements</match>
    <regex><script|javascript:|onerror=|onload=</regex>
    <description>CVE-2026-107866: Possible stored XSS injection attempt against JetElements For Elementor plugin</description>
    <mitre>
      <id>T1059.007</id>
    </mitre>
    <group>cve_2026_107866,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).

1. Immediate mitigations

   • Restrict content authoring privileges: limit low-privileged accounts (contributor/author) to trusted personnel only, and minimize the number of users who can publish or preview content.
   • Deploy a web application firewall (WAF) with rules to block script tags and event-handler attributes in requests targeting the plugin.
   • Consider disabling the JetElements For Elementor plugin until a vendor patch is available if the functionality is non-critical.
   • Apply a Content Security Policy (CSP) that prevents inline script execution to reduce the impact of any injected payload.

2. Patch/upgrade steps

   • No official patch currently exists. Monitor the Crocoblock vendor advisory channels and the WordPress plugin repository for a fixed version.
   • Once a patched version is released, validate it in a staging environment before upgrading. Because no specific patched version is currently known, do not assume any existing version is safe.

3. Long-term hardening

   • Enforce strict input validation and output encoding practices across any custom plugin integrations.
   • Conduct regular plugin inventory and vulnerability scanning of the WordPress estate.
   • Implement role-based access controls using the principle of least privilege.
   • Enable logging and alerting for content-authoring actions performed by low-privileged accounts.

References

1. NVD — CVE-2026-107866: https://nvd.nist.gov/vuln/detail/CVE-2026-107866
2. Crocoblock JetElements For Elementor product page (vendor advisory pending): https://crocoblock.com/plugins/jetelements/
3. CWE-79 — Improper Neutralization of Input During Web Page Generation: https://cwe.mitre.org/data/definitions/79.html
4. MITRE ATT&CK T1059.007 — JavaScript: https://attack.mitre.org/techniques/T1059/007/
5. FIRST EPSS — Not yet scored for this CVE (no exploit probability available at time of writing).

No known threat actor campaigns or exploit-in-the-wild evidence has been identified for CVE-2026-107866. No public PoC, Nuclei template, or exploit code is currently available. CISA KEV does not list this CVE.