Vulnpedia
← All CVEs

CVE-2026-5430

CRITICAL 10 KNOWN EXPLOITED PoC CATALOGUED ALL-YEARS

Published 2026-08-06 · Last modified 2026-09-25 · WSO2 · NVD: Analyzed

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

Confirmed exploited in the wild — in CISA KEV since 2026-09-24. Patch or mitigate now.

Exploitation likelihood

22.4%chance of exploitation in 30 days · 98th percentile

● In CISA KEV (2026-09-24)● Catalogued PoC◆ SSVC: exploitation active, automatable yes

Impact if exploited

10CVSS 3.1 · CRITICAL · CNA

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

Public PoC or exploit resources are catalogued below.

Listed by the named source; Vulnpedia has not tested these resources.

PoC data: JSON

Resource commands

curl -s https://vulnpedia.com/cve/CVE-2026-5430/poc.jsonMachine-readable PoC index for this CVE (for automation).

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Wso2

Products Wso2 Universal Gateway Wso2 Traffic Manager Wso2 Api Control Plane Wso2 Api Manager Wso2 Carbon Api Manager Rest Api Utility Api Control Plane Api Manager Traffic Manager Universal Gateway

Weakness (CWE)

  • CWE-347: : Improper Validation of Certificate With Host Mismatch

CVSS vector

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

References and research data (JSON)

Unverified PoC candidates

Catalogue matches for further research. These repositories have not been validated as working exploits.

4 candidates

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

  • VulnCheck KEV · 2026-09-15T00:00:00Z

    Source guidance: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

    Source ransomware assessment: Unknown

    VulnCheck KEV · CVE-2026-5430 · Updated 2026-09-15T00:00:00Z
  • VulnCheck KEV · 2026-09-15T00:00:00ZVulnCheck KEV · CVE-2026-5430
  • VulnCheck KEV · 2026-09-24T00:00:00ZVulnCheck KEV · CVE-2026-5430
  • VulnCheck KEV · 2026-10-07T00:00:00ZVulnCheck KEV · CVE-2026-5430

Known Affected Software Configurations

VendorProductVersion range
Wso2Api Control Plane≥ 4.5.0 and < 4.5.0.58
Wso2Api Control Plane≥ 4.6.0 and < 4.6.0.22
Wso2Api Manager≥ 4.1.0 and < 4.1.0.257
Wso2Api Manager≥ 4.2.0 and < 4.2.0.197
Wso2Api Manager≥ 4.3.0 and < 4.3.0.108
Wso2Api Manager≥ 4.4.0 and < 4.4.0.72
Wso2Api Manager≥ 4.5.0 and < 4.5.0.57
Wso2Api Manager≥ 4.6.0 and < 4.6.0.21
Wso2Traffic Manager≥ 4.5.0 and < 4.5.0.56
Wso2Traffic Manager≥ 4.6.0 and < 4.6.0.21
Wso2Universal Gateway≥ 4.5.0 and < 4.5.0.57
Wso2Universal Gateway≥ 4.6.0 and < 4.6.0.21

All CVSS metrics

  • CRITICAL 10 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
  • CRITICAL 10 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS