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CVE-2026-5430

CRITICALCVSS 10/10Actively ExploitedEPSS 0.37%

Last modified

CVE-2026-5430 is a critical-severity vulnerability rated 10/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
10/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability
0.37%

28.6th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .

Weakness Enumeration

Affected Software

VendorProductVersions
Wso2Api Control Plane>= 4.5.0, < 4.5.0.58
Wso2Api Control Plane>= 4.6.0, < 4.6.0.22
Wso2Api Manager>= 4.1.0, < 4.1.0.257
Wso2Api Manager>= 4.2.0, < 4.2.0.197
Wso2Api Manager>= 4.3.0, < 4.3.0.108
Wso2Api Manager>= 4.4.0, < 4.4.0.72
Wso2Api Manager>= 4.5.0, < 4.5.0.57
Wso2Api Manager>= 4.6.0, < 4.6.0.21
Wso2Traffic Manager>= 4.5.0, < 4.5.0.56
Wso2Traffic Manager>= 4.6.0, < 4.6.0.21
Wso2Universal Gateway>= 4.5.0, < 4.5.0.57
Wso2Universal Gateway>= 4.6.0, < 4.6.0.21

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-5430?
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.
How severe is CVE-2026-5430?
CVE-2026-5430 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2026-5430?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST