CVE-2025-61152 Auth bypass in n/a
Attackers can bypass authentication by crafting unsigned JWT tokens if signature verification is disabled, leading to privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-61152?
CVE-2025-61152 is a medium-severity authentication bypass vulnerability in n/a, published on 10 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any cryptographic signature verification. A malicious actor can craft a forged token with arbitrary claims (e.g., is_admin=true) and bypass authentication checks, leading to privilege escalation or unauthorized access in applications that rely on python-jose for token validation. This issue is exploitable unless developers explicitly reject 'alg=none' tokens, which is not enforced by the library. NOTE: all parties agree that the issue is not relevant because it only occurs in a "verify_signature": False situation.
Weakness: CWE-269
Which versions are affected by CVE-2025-61152?
How do I fix CVE-2025-61152?
No fix has been published for CVE-2025-61152 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-61152 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-61152 exists.
Sources
Also known as GHSA-28pv-f4g7-364j, UBUNTU-CVE-2025-61152.