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CVE-2026-44596

CriticalPublished

Yamcs: No Rate Limiting on Authentication Endpoint

Published: Jul 16, 2026
Updated: Jul 17, 2026
Assigning CNA: GitHub_M
Evidence observed: May 30, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

2.1%

Low · next 30 days

Percentile: 80.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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.

Sources

CVE-2026-44596PoC
YAMCS yamcs-core < 5.12.7 lacks rate limiting on POST /auth/token. An unauthenticated attacker can perform unlimited brute-force attempts against any account. Never returns HTTP 429. Fixed in 5.12.7.
YAMCS yamcs-core 5.12.7 - No Rate LimitingExploit
Daniel Miranda · multiple · May 30, 2026

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