What’s Vulnerable › Vulnerabilities

CVE-2026-44596: Yamcs: No Rate Limiting on Authentication Endpoint

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-07-16 · updated 2026-07-17
• Weakness: CWE-307

Description

Yamcs is a mission control framework. Prior to 5.12.7, the authentication endpoint POST /auth/token in yamcs-core, handled by yamcs-core/src/main/java/org/yamcs/http/auth/AuthHandler.java, lacked any rate limiting, account lockout, or failed-attempt throttling, so an unauthenticated remote attacker could perform unlimited password-guessing attempts against any user account, significantly increasing the risk of successful brute-force attacks. This issue is fixed in versions 5.12.7 and 5.13.0.

Affected products

• yamcs: before 5.12.7 — fixed in 5.12.7

How to fix

Upgrade to a fixed version: yamcs 5.12.7. Check the vendor advisory for mitigations.

References

• https://github.com/yamcs/yamcs/commit/309218c651680f79df11a8d0f8628f7033f98a83
• https://github.com/yamcs/yamcs/commit/64392df531fbcbc65f19ee5724c4c23d289f49fc
• https://github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7
• https://github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0
• https://github.com/yamcs/yamcs/security/advisories/GHSA-w5r6-mcgq-7pq4
• https://github.com/yamcs/yamcs/security/advisories/GHSA-w5r6-mcgq-7pq4

Get alerted when CVE-2026-44596 or the next vulnerability affects your stack