Summary
generated automatically from NVD dataWSO2 API Manager, API Control Plane, Traffic Manager and Universal Gateway have a JWT authentication flaw (CWE-347) in which tokens signed with algorithms that are not configured or supported are still accepted as valid. An attacker can craft such a JWT to gain unauthorized access, potentially compromising administrative accounts and taking over accounts entirely. It is rated CVSS 10.0 (CRITICAL), adjusted to 9.8 for single-tenant deployments, and is listed in the CISA KEV catalog, indicating active exploitation.
NVD 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.
⚠️ Actively exploited — CISA KEV
This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2026-09-24. It is confirmed exploited in the wild and must be patched as a priority.
Remediation deadline (US federal agencies): 2026-09-27
EPSS · FIRST.org
0.59%probability of exploitation in the next 30 days
Higher than 47% of scored CVEs
EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-16, recomputed daily by FIRST.org.
In-depth analysis on cveo.tech
We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.
CVSS v3.1 Score
Information
- Published
- 6 août 2026
- Updated
- 25 sept. 2026
- Status
- Analyzed
- Source
- ed10eef1-636d-4fbe-9993-6890dfa878f8
Affected products
Weaknesses (CWE)
References (2)
Similar CVEs
Other vulnerabilities of type CWE-347
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