CVE-2026-5430
CWE-347
80.9
RPSRPS range: 0–105; KEV-listed vulnerabilities can receive an exploitation amplifier.
Description
The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or supported. This allows an attacker to craft a JWT with an unsupported algorithm, which is then incorrectly validated, leading to unauthorized access. Successful exploitation of this vulnerability may result in unauthorized access to the system, including the potential compromise of administrative accounts and full account takeover. The CVSS score is adjusted to 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) in single-tenant deployments, reflecting that the impact is contained within a single security authority boundary.
Source: NVD
Signals
- CVSS
- 10.0
- Critical · v3.1
- EPSS
- 0.58%
- Probability of exploitation in the next 30 days (FIRST)
- CISA KEV
- In CISA KEV since Sept 2026
- Fix commit
- No known fix commit
- Sources: MoreFixes, FreshFixes
- Weakness
- CWE-347
- Published
- 6 Aug 2026
- Last modified 25 Sept 2026
How to read these signals: RPS · EPSS · CISA KEV · Data sources
Get this score from the API
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Data as of 7 Oct 2026, 05:16 UK time