Skip to content
Fencer Vulns
medium 6.5

CVE-2026-44596 json

Yamcs: No Rate Limiting on Authentication Endpoint

published 2026-05-27 5 mo ago modified 2026-07-17 3 mo ago also GHSA-w5r6-mcgq-7pq4 , EUVD-2026-44956

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • maven org.yamcs:yamcs-core 5.12.7
  • spaceapplications yamcs 5.12.7

Timeline

  1. Published
  2. First public exploit (EDB-52605)

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

2.06% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-52605 YAMCS yamcs-core 5.12.7 - No Rate Limiting webapps, 2026-05-30
  • github.com https://github.com/yamcs/yamcs/security/advisories/GHSA-w5r6-mcgq-7pq4 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.yamcs:yamcs-core
<5.12.7
5.12.7

Affected products

  • yamcs yamcs

Classification

Weakness
  • CWE-307 Improper Restriction of Excessive Authentication Attempts

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.