Strix
26.1K

CVE-2026-5430

CRITICALCVSS 10/10EPSS 0.22%

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. EPSS estimates a 0.22% 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
0.22%

12.9th percentile

Probability of exploitation in the next 30 days. Learn more

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 0.22% probability of exploitation in the next 30 days.
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.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →

Are you affected by CVE-2026-5430?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST