What’s Vulnerable › Vulnerabilities

CVE-2026-42300: DevGuard: Unauthenticated identity assertion via `X-Admin-Token` header

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-12 · updated 2026-10-26
• Weakness: CWE-288

Description

DevGuard provides vulnerability management for the full software supply chain. Prior to 1.2.2, the SessionMiddleware accepts a client-supplied X-Admin-Token HTTP request header and uses its raw string value as the authenticated userID when no Kratos session cookie is present. An unauthenticated attacker who knows or can guess a target user's Kratos identity UUID can issue requests as that user. Where the target user is an organisation admin or owner, this gives the attacker full control over that organisation's DevGuard resources. This vulnerability is fixed in 1.2.2.

Affected products

• l3montree-dev devguard: before 1.2.2

References

• https://github.com/l3montree-dev/devguard/commit/6f38310bf93b2a63df3055038f4da82b1f4e6d9a
• https://github.com/l3montree-dev/devguard/security/advisories/GHSA-2g9v-7mr5-fgjg

Get alerted when CVE-2026-42300 or the next vulnerability affects your stack