CVE-2026-44596

Yamcs: No Rate Limiting on Authentication Endpoint

CVSS 6.5 MEDIUMCWE-307

Vexday Risk Score

30Low

SSVC decision (CISA)

Attend

PoC available → attend closely

Exploit maturity

Proof of concept

Public proof of concept exists, but not yet automated.

CVSS 6.5EPSS —KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

29 May 2026Public PoC

16 Jul 2026Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected products

yamcs · yamcs

public PoCs found — 2

githubgithub.com/ex-cal1bur/CVE-2026-44596★ 0 exploitdbwww.exploit-db.com/exploits/52605unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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