CVE-2026-15015MountDev AI MCP Connector for WordPress <= 1.6.1 - Unauthenticated Privilege Escalation via OAuth Authorization Endpoint
- 9.8CriticalCVSS base score
- 2.6%Exploitation in 30 daysEPSS · top 14% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- 1Public exploitsMetasploit, Nuclei and Exploit-DB
Description
The MountDev AI MCP Connector for WordPress plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.6.1. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to obtain an administrator-bound OAuth Bearer token via a self-registered client, granting full administrator-equivalent access to the plugin's MCP tool surface and all exposed WordPress content, users, and options. This is exploitable by combining the publicly accessible Dynamic Client Registration endpoint, which allows unauthenticated callers to register arbitrary OAuth clients with an attacker-controlled redirect_uri, with the unprotected authorization endpoint to complete the full OAuth flow without any administrator interaction.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. The public collections list a Nuclei template for it.
Show the exploits1
Nuclei templates1 template
- MountDev AI MCP Connector <= 1.6.1 - Unauthenticated Admin OAuth Token Exposure (Nuclei template) (opens in a new tab)
http/cves/2026/CVE-2026-15015.yamlSeverity critical
Modules, templates and exploits as listed by the Metasploit Framework (BSD-3-Clause), ProjectDiscovery's Nuclei templates (MIT) and the Exploit Database (GPLv2), read once a day. Where the data comes from
Timeline
ID reserved
By Wordfence
- 16 days later
· 16 days later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WordfenceCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 2.6% · top 14% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
cascadiawebservices · MountDev AI MCP Connector for WordPress
- affected ≤ 1.6.1
References
References6
- https://www.wordfence.com/threat-intel/vulnerabilities/id/ce8ec66f-5efc-4354-8871-8e35ab4e51fc?source=cve (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/mountdev-ai-mcp-connector/tags/1.6.0/includes/class-oauth-controller.php#L571 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/mountdev-ai-mcp-connector/tags/1.6.0/includes/class-oauth-controller.php#L474 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/mountdev-ai-mcp-connector/tags/1.6.0/includes/class-oauth-controller.php#L188 (opens in a new tab)
- https://plugins.trac.wordpress.org/browser/mountdev-ai-mcp-connector/tags/1.6.0/includes/class-oauth-controller.php#L370 (opens in a new tab)
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3601448%40mountdev-ai-mcp-connector&new=3601448%40mountdev-ai-mcp-connector (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-47907 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-15015)Record last updated .