Vulnerability-Lookup

CVE-2026-5430 (GCVE-0-2026-5430)

Vulnerability from cvelistv5 – Published: 2026-08-06 07:33 – Updated: 2026-08-06 12:30

Title

Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover

Summary

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.

Severity

10 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-347 - Improper Validation of Certificate With Host Mismatch

Assigner

WSO2

References

1 reference

URL	Tags
https://security.docs.wso2.com/en/latest/security…	vendor-advisory

Impacted products

5 products

Vendor	Product	Version
WSO2	WSO2 Universal Gateway	Affected: 4.5.0 , < 4.5.0.57 (custom) Affected: 4.6.0 , < 4.6.0.21 (custom)
WSO2	WSO2 Traffic Manager	Affected: 4.5.0 , < 4.5.0.56 (custom) Affected: 4.6.0 , < 4.6.0.21 (custom)
WSO2	WSO2 API Control Plane	Affected: 4.5.0 , < 4.5.0.58 (custom) Affected: 4.6.0 , < 4.6.0.22 (custom)
WSO2	WSO2 API Manager	Unknown: 0 , < 4.1.0 (custom) Affected: 4.1.0 , < 4.1.0.257 (custom) Affected: 4.2.0 , < 4.2.0.197 (custom) Affected: 4.3.0 , < 4.3.0.108 (custom) Affected: 4.4.0 , < 4.4.0.72 (custom) Affected: 4.5.0 , < 4.5.0.57 (custom) Affected: 4.6.0 , < 4.6.0.21 (custom)
WSO2	WSO2 Carbon API Manager Rest API Utility	Affected: 9.20.74 , < 9.20.74.401 (custom) Affected: 9.28.116 , < 9.28.116.417 (custom) Affected: 9.29.120 , < 9.29.120.236 (custom) Affected: 9.30.67 , < 9.30.67.167 (custom) Affected: 9.31.86 , < 9.31.86.158 (custom) Affected: 9.32.147 , < 9.32.147.59 (custom) Unaffected: 9.33.106 , ≤ * (custom)

Credits

hacktron.ai

Show details on NVD website

JSON

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      "cveMetadata": "{\"cveId\": \"CVE-2026-5430\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-06T12:30:55.383Z\", \"dateReserved\": \"2026-04-02T16:11:32.536Z\", \"assignerOrgId\": \"ed10eef1-636d-4fbe-9993-6890dfa878f8\", \"datePublished\": \"2026-08-06T07:33:28.156Z\", \"assignerShortName\": \"WSO2\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
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  }
}

GHSA-J7VH-5W8Q-4M4X

Vulnerability from github – Published: 2026-08-06 09:30 – Updated: 2026-08-06 09:30

Details

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.

Severity

10.0 (Critical)


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

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-5430"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-06T08:16:33Z",
    "severity": "CRITICAL"
  },
  "details": "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.\n\nSuccessful 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.",
  "id": "GHSA-j7vh-5w8q-4m4x",
  "modified": "2026-08-06T09:30:32Z",
  "published": "2026-08-06T09:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5430"
    },
    {
      "type": "WEB",
      "url": "https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-5430 (GCVE-0-2026-5430)

GHSA-J7VH-5W8Q-4M4X

Tags

Sightings

Nomenclature