Vulnerability · Published Sep 6, 2026 · Assigned by VulnCheck

CVE-2026-86259OpenMAIC before 1.0.1 SSRF via Environment-Gated URL Validation

High 7.5

In plain English

A high-severity server-side request forgery in OpenMAIC from THU-MAIC. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.4%top 63.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Public PoC

Official description

OpenMAIC before 1.0.1 skips server-side request forgery validation in non-production builds, allowing unauthenticated attackers to reach cloud instance metadata services. Attackers can supply arbitrary provider URLs via the x-base-url header or baseUrl parameter to access sensitive cloud credentials and metadata.

Affected products (as reported)

Vendor	Product	Versions
THU-MAIC	OpenMAIC	0 – before 1.0.1

Weakness: CWE-918, CWE-306 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

References

GitHub Security Advisory (GHSA-9m7h-vh2h-rc3w) vendor-advisory
Fail-open access-code middleware at v1.0.0 technical-description
NODE_ENV-gated SSRF validation at v1.0.0 technical-description
OpenMAIC v1.0.1 Release Notes patch, release-notes
https://github.com/THU-MAIC/OpenMAIC product
VulnCheck Advisory: OpenMAIC before 1.0.1 SSRF via Environment-Gated URL Validation third-party-advisory