Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M

CVE-2026-105806Payload: Improper access control for MCP API keys

High 8.6

In plain English

A high-severity missing authorization in payload from payloadcms. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.6High

Exploit odds (30 days)0.3%top 83.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Payload is a free and open source headless content management system. In @payloadcms/plugin-mcp versions from 3.61.0 until 3.88.0, an authenticated user can manage MCP API keys outside the intended account, enabling privilege escalation through account takeover. This issue is fixed in version 3.88.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@payloadcms/plugin-mcp	3.88.0	GHSA-2q76-m6w6-qgc6

Affected products (as reported)

Vendor	Product	Versions
payloadcms	payload	>= 3.61.0, < 3.88.0
@payloadcms	plugin-mcp	>= 3.61.0, < 3.88.0

Weakness: CWE-862 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

References

https://github.com/payloadcms/payload/security/advisories/GHSA-2q76-m6w6-qgc6 x_refsource_CONFIRM
https://github.com/payloadcms/payload/commit/025581d8c5ed836039ad85397288a30f0d3c11c1 x_refsource_MISC
https://github.com/payloadcms/payload/releases/tag/v3.88.0 x_refsource_MISC