CVE-2026-44596 Yamcs: No Rate Limiting on Authentication Endpoint
An unauthenticated attacker can brute-force user passwords due to missing rate limiting on the authentication endpoint, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-44596?
CVE-2026-44596 is a medium-severity vulnerability in yamcs, published on 16 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-307
Which versions are affected by CVE-2026-44596?
2 open source packages ship an affected version, including org.yamcs:yamcs-core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
org.yamcs:yamcs-core Maven | All versions | 5.12.7 |
org.yamcs:yamcs-core Maven | All versions | 5.12.7 |
Products include Spaceapplications Yamcs.
How do I fix CVE-2026-44596?
Upgrade org.yamcs:yamcs-core to 5.12.7 or later.
Is CVE-2026-44596 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-44596 exists.
Public exploit code: 1 Exploit-DB entry and 1 proofs of concept on GitHub.
Other vulnerabilities in yamcs
- CVE-2026-46562 Yamcs: Remote Code Execution via Mission Database algorithm override
- CVE-2026-44632 Yamcs: Server-Side Code Injection (RCE) via Janino Expression Engine in `JavaExprAlgorithmExecutionFactory`
- CVE-2026-46621 Yamcs: Authenticated Remote Code Execution (RCE) via Jython Algorithm Code Injection
- CVE-2023-45278 Yamcs API Directory Traversal vulnerability
- CVE-2023-45277 Yamcs Path Traversal vulnerability
Sources
Also known as GHSA-w5r6-mcgq-7pq4.