Vulnerability in Spaceapplications Yamcs
CVE-2026-44596
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.021 (81.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000
Affected products
- Spaceapplications Yamcs
- Yamcs — versions < 5.12.7
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/yamcs/yamcs/security/advisories/GHSA-w5r6-mcgq-7pq4 (Exploit, Vendor Advisory)
- github.com/yamcs/yamcs/commit/309218c651680f79df11a8d0f8628f7033f98a83 (Patch)
- github.com/yamcs/yamcs/commit/64392df531fbcbc65f19ee5724c4c23d289f49fc (Patch)
- github.com/yamcs/yamcs/releases/tag/yamcs-5.12.7 (Release Notes)
- github.com/yamcs/yamcs/releases/tag/yamcs-5.13.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-44596?
- CVE-2026-44596 is a medium-severity vulnerability in Spaceapplications Yamcs, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 6.5/10. Published 2026-07-16.
- How severe is CVE-2026-44596?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2026-44596 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.