Dashboard / CVE-2026-120459

CVE-2026-120459

CRITICAL
INFO Priority: 0.02 BB Relevance: 78/100
Published: 2026-11-02 Modified: 2026-11-09 First seen: 2026-11-02 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
AT: Present
VC: High
VI: High
VA: None

Description

python-jose through 3.5.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge JWTs because HMACKey and CryptographyHMACKey accept zero-length HMAC secrets. When an application's HS256/HS384/HS512 verification key resolves to empty, such as an oct JWK with empty k, attackers can forge tokens with arbitrary claims that jwt.decode accepts.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
mpdavis python-jose 0
mpdavis python-jose 0

References & Advisories (4)

Bug Bounty Relevance

78 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

9.1 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

EPSS — Exploitation Probability

0.25%
Raw Score 0.002510
Percentile 16.6%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00251
2026-11-12
0.00251
2026-11-10
0.00251
2026-11-09
0.00251
2026-11-08
0.00251
2026-11-07
0.00251
2026-11-06
0.00251
2026-11-05
0.00251
2026-11-04
0.00251
2026-11-03
0.00251

Intelligence Sources

mitre ref →
nvd ref →

External Links