PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-8839 chrisvrichardson CVE debrief

The MapPress Maps for WordPress plugin, up to and including version 2.96.6, is vulnerable to Authorization Bypass Through User-Controlled Key. This vulnerability is due to missing ownership verification in the REST API routes registered via `Mappress_Api::rest_api_init()`. Specifically, the GET `/wp-json/mapp/v1/maps/{mapid}` endpoint uses `'permission_callback' => '__return_true'`, allowing unauthenticated access, while write endpoints (POST update, DELETE, PATCH mutate, POST clone, POST empty_trash) only check the generic `edit_posts` capability without confirming the requester owns the targeted map. This gap is not compensated at the model layer, as `Mappress_Map::get()`, `save()`, `delete()`, `mutate()`, and `empty_trash()` operate on any caller-supplied map ID without an ownership check.

Vendor
chrisvrichardson
Product
MapPress Maps for WordPress
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-06
Original CVE updated
2026-07-23
Advisory published
2026-06-06
Advisory updated
2026-07-23

Who should care

Users of the MapPress Maps for WordPress plugin, particularly those with sensitive map data, should be aware of this vulnerability. Unauthenticated attackers can read sensitive map data, including POI titles, addresses, coordinates, and body content, by enumerating map IDs. Authenticated attackers with Contributor-level access and above can modify, delete, trash/restore, or clone any map regardless of its author.

Technical summary

The vulnerability exists in the MapPress Maps for WordPress plugin, versions up to and including 2.96.6. The REST API routes lack proper ownership verification, allowing for unauthorized access and manipulation of map data.

Defensive priority

MEDIUM

Recommended defensive actions

  • Update to a patched version of the MapPress Maps for WordPress plugin.
  • Restrict access to sensitive map data.
  • Monitor for suspicious activity on your WordPress site.

Evidence notes

Evidence for this CVE comes from the National Vulnerability Database (NVD) and Wordfence security research.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-8839 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-8839

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-8839 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-8839

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/mappress-google-maps-for-wordpress/tags/2.95.10/mappress_api.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/mappress-google-maps-for-wordpress/tags/2.95.10/mappress_api.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/mappress-google-maps-for-wordpress/tags/2.95.10/mappress_api.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/mappress-google-maps-for-wordpress/tags/2.95.10/mappress_api.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/mappress-google-maps-for-wordpress/tags/2.95.10/mappress_api.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/mappress-google-maps-for-wordpress/tags/2.95.10/mappress_api.php

    [email protected]

  • Source reference

    Unverified legacy reference

    URL: https://plugins.trac.wordpress.org/browser/mappress-google-maps-for-wordpress/tags/2.95.10/mappress_api.php

    [email protected]

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.