CVE-2026-85309

Executive Summary

CVE-2026-85309 is a Missing Authorization vulnerability (CWE-862) affecting the WordPress plugin Ultimate Maps by Supsystic, impacting all versions from n/a through 1.5.3. The vulnerability enables an unauthenticated remote attacker to exploit incorrectly configured access control security levels, resulting in a low-impact integrity compromise of the application. With a CVSS score of 5.3 (Medium), the flaw requires no authentication or user interaction and can be triggered over the network, though it does not permit confidentiality breaches or direct availability impact. Patch confidence is 0/4 — no vendor fix exists at the time of this report, and no public exploit code or PoC has been identified.

Technical Analysis

Vulnerability Class & Mechanism

CVE-2026-85309 falls under CWE-862 (Missing Authorization). This vulnerability class indicates that the affected software fails to perform an adequate authorization check when a specific functionality or resource is accessed. In WordPress plugin contexts, this typically manifests when:

1. AJAX action handlers or administrative endpoints are registered without verifying the caller's capability level.
2. REST API routes declare incorrect permission callbacks, allowing unauthenticated invocation.
3. Shortcode or front-end processing hooks grant excessive privileges to unauthenticated users.

The NVD description characterizes the issue as "Exploiting Incorrectly Configured Access Control Security Levels," which suggests that the plugin's permission model contains a fundamental design flaw — endpoints intended as protected are reachable without proper capability checks (e.g., missing the required current_user_can() check in WordPress).

Attack Surface

• Affected application: Ultimate Maps by Supsystic (WordPress plugin), versions ≤ 1.5.3.
• Attack vector: Network (CVSS:AV:N) — the vulnerability is reachable remotely without physical or local access.
• Authentication required: None (CVSS:PR:N) — unauthenticated attacker.
• User interaction: None required (CVSS:UI:N).
• Attack complexity: Low (CVSS:AC:L) — no special conditions or race conditions required for exploitation.

Technical Specifics

Due to the sparse nature of the NVD description, insufficient technical detail is available to cite specific function names, file paths, or URL endpoints. The CNA description is limited to the class and general mechanism of the flaw. Based on the vulnerability class (CWE-862) and the plugin's typical WordPress architecture, the affected code paths most likely involve:

• Callback functions for the plugin's AJAX API (e.g., map creation, configuration updates, or settings modifications).
• Server-side validation missing WordPress capability checks.

Key observation: The presence of "Wrong Access Control" phrasing indicates the developer likely attempted to implement authorization controls but did so incorrectly — perhaps relying on client-side role checks, or exposing admin-level functionality through publicly registered hooks without suitable back-end verification.

Exploitation Scenarios

No public PoC is available; attack chain is inferred from vulnerability class.

Step 1: Reconnaissance & Target Identification

The attacker scans for WordPress installations running the Ultimate Maps by Supsystic plugin. Reconnaissance vectors include:

• WordPress plugin version fingerprinting via readme.txt or page source references (wp-content/plugins/ultimate-maps-by-supsystic/).
• Identifying "Powered by" strings in the rendered map widget.
• Using search engines or scanner tools (e.g., WPScan) to enumerate vulnerable sites running plugin version ≤ 1.5.3.

Step 2: Triggering the Flaw Class

The attacker sends crafted HTTP requests (GET/POST) to the plugin's publicly exposed endpoints (e.g., WordPress admin-ajax.php action handlers with plugin-specific actions). Because the plugin fails to validate that the requesting user is authorized at the appropriate access control level, these requests are processed as valid even without a logged-in session.

Step 3: Payload & Execution Method (Class-Level)

At the CWE-862 class level, execution typically involves:

• Setting manipulation: Issuing requests that modify plugin settings (map configurations, API keys, embedded content) without authentication.
• Privilege escalation: Altering parameters that the plugin persists server-side, such as map display content or data tied to the affected site.

Since the CVSS sub-score shows Integrity Impact: Low (I:L), the attacker can alter certain data fields but cannot access confidential data (C:N) or cause denial-of-service (A:N). This constraint suggests the exploitable behavior affects a limited data category within the plugin.

Step 4: Post-Exploitation Impact

Upon successful manipulation, the attacker can:

• Modify map settings to inject attribution changes or incorrect map coordinates.
• Alter stored map content to deface widget output visible to site visitors.
• Potentially tamper with plugin configuration values that influence the map rendering behavior in a persistent manner.

Note: There is no evidence this flaw can escalate to remote code execution or WordPress administrator account takeover, given no PoC or exploit code is publicly available and the integrity impact is scored as low.

Impact Assessment

Given the moderate severity score and absence of proof-of-concept material, the immediate operational risk remains low-to-moderate for production environments, but the lack of vendor patching elevates the risk profile for any WordPress deployment using this plugin over time, as the flaw will remain exploitable indefinitely without mitigations.

Detection Guidance

Note: Since no public exploit or C2 infrastructure is known, the following detection rules focus on detecting anomalous HTTPS requests targeting the affected plugin's administrative interfaces from unauthenticated users.

Sigma Rule

title: Unauthenticated Requests to Ultimate Maps by Supsystic - CVE-2026-85309
id: 6b6b2a29-6ceb-4a73-9c14-9d6e5e2a7f11
status: experimental
description: Detects unauthenticated HTTP requests targeting Ultimate Maps by Supsystic plugin endpoints, potentially exploiting CWE-862 Missing Authorization vulnerability (CVE-2026-85309).
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-85309
author: Valtersit Threat Intelligence
date: 2026/11/14
logsource:
    category: webserver
    product: apache
detection:
    selection_plugin_path:
        cs-method:
            - 'GET'
            - 'POST'
        cs-uri-query|contains:
            - 'ultimate-maps-by-supsystic'
            - 'supsystic'
            - 'map-supsystic'
    filter_logged_in:
        cs-uri-query|contains:
            - 'logged_in'
    condition: selection_plugin_path and not filter_logged_in
fields:
    - client_ip
    - user_agent
    - cs-uri-query
falsepositives:
    - Legitimate map management requests from authenticated administrators with cookies attached
level: medium
tags:
    - attack.t1190
    - cve.2026-85309
    - cwe.862

YARA Rule

rule CVE_2026_85309_Ultimate_Maps_Supsystic_Exp
{
    meta:
        author      = "Valtersit Threat Intelligence"
        description = "Detects web requests targeting Ultimate Maps by Supsystic plugin with potential unauthorized administrative parameter manipulation (CVE-2026-85309)"
        reference   = "https://nvd.nist.gov/vuln/detail/CVE-2026-85309"
        date        = "2026-11-14"
        score       = 60
        cve_id      = "CVE-2026-85309"
    strings:
        $plugin_dir = "ultimate-maps-by-supsystic"
        $plugin_dir_short = "/supsystic"
        $map_action_a   = "psMap"
        $map_action_b   = "mapController"
        $ajax_request   = "admin-ajax.php"
        $post_action    = "&action="
        $settings_keyword = "settings"
        $config_keyword   = "config"
        $noauth_indicators = "wpnonce="
    condition:
        (uint16(0) == 0x0d0a or filesize < 8KB) and
        any of ($plugin_dir*) and
        any of ($map_action*) and
        (1 of ($ajax_request, $settings_keyword, $config_keyword)) and
        #noauth_indicators == 0
}

Suricata IDS Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2026-85309 - Potential Unauthorized Access to Ultimate Maps by Supsystic Plugin";
    flow:established,to_server;
    http.uri;
    content:"ultimate-maps-by-supsystic";
    http.uri;
    content:"admin-ajax.php";
    http.uri;
    pcre:"/(?:psMap|mapController|mod=map|map_id)/i";
    http.method;
    content:!:"POST";
    threshold:type limit, track by_src, seconds 60, count 5;
    classtype:attempted-admin;
    reference:cve,2026-85309;
    reference:url,https://nvd.nist.gov/vuln/detail/CVE-2026-85309;
    sid:2026111401; rev:1;
)

Elastic Detection

sequence by source.ip with maxspan=15s
  [ network where dns.question.name : "*wordpress*" or url.path : "*wp-content*" ]
  [ http where 
      url.path : ("*ultimate-maps-by-supsystic*", "*admin-ajax.php*") and
      url.path : ("*action=*") and
      not user.name : * 
  ]

Alternative simpler variant if sequence is limiting:

http where 
  url.path : "*ultimate-maps-by-supsystic*" and 
  url.path : ("*mod=*", "*action=*") and
  not http.response.status_code : 302 and
  not user.name : *

Splunk SPL Query

index=web earliest=-7d
| where like(uri_path,"%ultimate-maps-by-supsystic%") 
    OR like(uri_path,"%supsystic%")
| search uri_query="*mod=map*" OR uri_query="*mapController*" OR uri_query="*psMap*"
| where NOT like(user,"%admin%") 
| where src_ip NOT IN [| inputlookup trusted_ips.csv | fields src_ip ]
| stats count min(_time) as firstSeen max(_time) as lastSeen by src_ip, uri, user_agent
| where count > 3
| eval anomaly_score = if(like(user_agent,"%curl%") OR like(user_agent,"%wpscan%") OR like(user_agent,"%python-requests%"), "high", "medium")
| table src_ip, firstSeen, lastSeen, count, uri, user_agent, anomaly_score

Wazuh OSSEC Rule

<group name="web_attacks,">
    <rule id="223396" level="10">
        <decoded_as>web</decoded_as>
        <description>CVE-2026-85309 - Unauthenticated request targeting Ultimate Maps by Supsystic WordPress plugin</description>
        <field name="url">\.*ultimate-maps-by-supsystic.*</field>
        <field name="url">\.*admin-ajax\.php.*action=.*</field>
        <regex>action=(psMap|mapController)</regex>
        <group>access_control_bypass,</group>
        <mitre>
            <id>T1190</id>
        </mitre>
        <info type="cve">CVE-2026-85309</info>
    </rule>
</group>

Mitigation & Patch Guidance

Patch Confidence: 0/4 — NO PATCH AVAILABLE. There is currently no vendor fix, security release, or upgrade path from Supsystic that addresses this vulnerability.

1. Immediate Mitigations (until vendor releases a fix)

• Disable or deactivate the Ultimate Maps by Supsystic plugin on production environments if maps are non-critical to business operation.
• Web Application Firewall (WAF) rule: Block URI patterns containing ultimate-maps-by-supsystic and admin-ajax.php for unauthenticated sessions (excluding known administrative IPs).
• Least-privilege access: Restrict the plugin's publicly-accessible callback routines via server-side .htaccess rules, disallowing direct PHP execution for the plugin's controller modules.
• Deploy virtual patching at the CDN/reverse-proxy layer to intercept unauthenticated POST requests with plugin-specific parameters.

2. Patch / Upgrade Steps

• Monitor the Supsystic vendor update channel for new releases. Subscribe to WordPress plugin changelogs for "Ultimate Maps by Supsystic".
• When a fix becomes available, upgrade to version > 1.5.3 (current latest version is 1.5.3 — upgrade is not possible yet).
• As an alternative migration path, identify and migrate to a comparable WordPress map plugin that is actively maintained and has a full security track record.
• Harden WordPress core: ensure the installation is on the latest WordPress version; missing authorization bugs in plugins are often mitigated when core authorization primitives are current.

3. Long-Term Hardening

• Apply WordPress security best practices:
  • Run only necessary plugins; conduct quarterly security audit of every installed extension.
  • Restrict admin-ajax.php action handlers with a whitelist plugin (e.g., using wp_ajax_nopriv_ checks).
  • Employ an identity-aware WAF that validates WordPress user cookies.
• Source code review: If you are an enterprise user with a WordPress VIP/VIP-like environment, request vendor disclosure of the exact incompletely-authorized endpoints and apply an in-house patch on the fork.
• Vulnerability management process: Track new CVEs for the plugin in your vulnerability scanner; the plugin should be flagged as "Critical — Will Not Patch" and trigger organizational risk acceptance workflow.
• In case the plugin is deemed essential and cannot be replaced, isolate its functionality behind a CDN that performs HTTP method filtering to POST requests only when a valid authentication header exists.

References

1. NVD Entry — https://nvd.nist.gov/vuln/detail/CVE-2026-85309 (NVD Description, CVSS vector, affected range analysis)
2. WordPress Plugin Repository — https://wordpress.org/plugins/ultimate-maps-by-supsystic/ (vendor distribution channel; check for changelog and future patched releases)
3. Supsystic Official Product Page — https://supsystic.com/plugin/ultimate-maps/ (vendor advisory location — currently no advisory)
4. CWE-862 Reference — https://cwe.mitre.org/data/definitions/862.html (Missing Authorization weakness details)
5. CISA Known Exploited Vulnerability Catalog — https://www.cisa.gov/known-exploited-vulnerabilities-catalog (confirms CVE-2026-85309 is NOT listed; no known active exploitation)

Threat Actor Campaigns & Exploit-in-the-Wild Evidence: None reported as of this report date. No exploit-di-the-wild activity, proof-of-concept availability, or threat-actor campaign references have been published. The EPSS score has not yet been calculated by FIRST.org, and Mitre/NVD have no associated CPE product mappings, further indicating limited research exposure. Security teams should nonetheless prioritize detection coverage given the plugin's unpatched status and unauthenticated attack vector.