CVE-2025-61152
- State
- Published
- Severity
- 6.5 Medium
- Published
- Oct 10, 2025
- Updated
- Nov 25, 2025
- Reserved
- Sep 26, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N | CISA-ADP |
Weaknesses
- CWE-269 Improper Privilege Management
Affected Products
| Product | Versions |
|---|---|
n/an/a |
|
References
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