How severe is CVE-2026-5430?

CVE-2026-5430 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-5430 being actively exploited?

Yes. CVE-2026-5430 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-09-24, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-5430?

CVE-2026-5430 primarily affects Wso2 Api Control Plane. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-5430?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

When was CVE-2026-5430 published?

CVE-2026-5430 was published on 2026-08-06 and last updated on 2026-09-25.

CVE-2026-5430

CVE-2026-5430 is a critical-severity vulnerability in Wso2 Api Control Plane with a CVSS 3.x base score of 10.0. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-09-24). The underlying weakness is classified as CWE-347.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-09-24)
Weakness: CWE-347
Affected product: Wso2 Api Control Plane
Published: 2026-08-06
Last modified: 2026-09-25

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.

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 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-5430 being actively exploited?: Yes. CVE-2026-5430 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-09-24, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-5430?: CVE-2026-5430 primarily affects Wso2 Api Control Plane. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-5430?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
When was CVE-2026-5430 published?: CVE-2026-5430 was published on 2026-08-06 and last updated on 2026-09-25.

References

Affected products (4)

cpe:2.3:a:wso2:api_control_plane:*:*:*:*:*:*:*:*
cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:wso2:traffic_manager:*:*:*:*:*:*:*:*
cpe:2.3:a:wso2:universal_gateway:*:*:*:*:*:*:*:*

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