Mapster WP Maps <= 1.23.0 - Authenticated (Subscriber+) Arbitrary User Meta Write via 'acf-photo-gallery-groups' Parameter
Strategic Overview
- Status
- Patched in 1.24.0
- Affected Plugin
- Mapster WP Maps
- Affected Version
<= 1.23.0- CVSS
- 8.8High
- Weakness type
- CWE-20 · Improper Input Validation
- CVE
CVE-2026-12954
At a glance
CVE-2026-12954 is a high-severity Improper Input Validation vulnerability in the Mapster WP Maps WordPress plugin, affecting versions <= 1.23.0. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account at Subscriber level or above. The issue is fixed in version 1.24.0; sites on affected versions should update now. Disclosed September 2026, reported by Wordfence PRISM.
Vulnerability Overview
The Mapster WP Maps plugin for WordPress is vulnerable to Arbitrary User Meta Write in all versions up to, and including, 1.23.0 via the `my_profile_update()` function. This is due to the function performing no nonce verification, no capability check, and no allowlist validation on the meta key supplied via the `acf-photo-gallery-groups` POST parameter before passing both the meta key and its corresponding value directly to `update_user_meta()`. This makes it possible for authenticated attackers, with Subscriber-level access and above, to update arbitrary user meta values, though privilege escalation is not possible.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.
CWE-20: Improper Input Validation
Mapster WP Maps <= 1.23.0 carries this weakness at my_profile_update(), and reaching it takes an account at Subscriber level or above. Improper input validation means the application accepts input without confirming it has the form, type or range the code downstream assumes.
The concrete impact depends on where the unvalidated value lands, which is why records in this class range from cosmetic bugs to full compromise. For Mapster WP Maps the fix is 1.24.0: builds <= 1.23.0 are affected, anything from 1.24.0 onward is not.
Remediation
Update to version 1.24.0, or a newer patched version
How does WordSec protect against this?
An attacker needs Subscriber access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Mapster WP Maps 1.24.0 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Other vulnerabilities in Mapster WP Maps
- 8.8CVE-2024-9235: Mapster WP Maps Incorrect Authorization
CVE-2024-9235 - 6.4CVE-2025-9044: Mapster WP Maps <= 1.20.0 Stored Cross-Site Scripting
CVE-2025-9044 - 6.4CVE-2024-10592: Mapster WP Maps <= 1.6.0 Stored Cross-Site Scripting
CVE-2024-10592 - 6.4CVE-2024-21744: Mapster WP Maps <= 1.2.38 Stored Cross-Site Scripting
CVE-2024-21744 - 6.1CVE-2024-13362: Freemius <= 2.10.1 Reflected DOM-Based XSS
CVE-2024-13362 - 5.3CVE-2026-14839: Mapster WP Maps < 1.24.0 Information Exposure
CVE-2026-14839
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C