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Critical

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

Type: advisorySource: Official CVE ListKnown exploited1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-5430

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-5430

WSO2 Universal Gateway

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

WSO2 Traffic Manager

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

WSO2 API Control Plane

Source reference: /containers/cna/affected/2/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

WSO2 API Manager

Source reference: /containers/cna/affected/3/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

WSO2 Carbon API Manager Rest API Utility

Source reference: /containers/cna/affected/4/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "WSO2",
    "product": "WSO2 Universal Gateway",
    "versions": [
      {
        "status": "affected",
        "version": "4.5.0",
        "lessThan": "4.5.0.57",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "4.6.0",
        "lessThan": "4.6.0.21",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "WSO2",
    "product": "WSO2 Traffic Manager",
    "versions": [
      {
        "status": "affected",
        "version": "4.5.0",
        "lessThan": "4.5.0.56",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "4.6.0",
        "lessThan": "4.6.0.21",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "WSO2",
    "product": "WSO2 API Control Plane",
    "versions": [
      {
        "status": "affected",
        "version": "4.5.0",
        "lessThan": "4.5.0.58",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "4.6.0",
        "lessThan": "4.6.0.22",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "WSO2",
    "product": "WSO2 API Manager",
    "versions": [
      {
        "status": "unknown",
        "version": "0",
        "lessThan": "4.1.0",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "4.1.0",
        "lessThan": "4.1.0.257",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "4.2.0",
        "lessThan": "4.2.0.197",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "4.3.0",
        "lessThan": "4.3.0.108",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "4.4.0",
        "lessThan": "4.4.0.72",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "4.5.0",
        "lessThan": "4.5.0.57",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "4.6.0",
        "lessThan": "4.6.0.21",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "WSO2",
    "product": "WSO2 Carbon API Manager Rest API Utility",
    "versions": [
      {
        "status": "affected",
        "version": "9.20.74",
        "lessThan": "9.20.74.401",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.28.116",
        "lessThan": "9.28.116.417",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.29.120",
        "lessThan": "9.29.120.236",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.30.67",
        "lessThan": "9.30.67.167",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.31.86",
        "lessThan": "9.31.86.158",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.32.147",
        "lessThan": "9.32.147.59",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "9.33.106",
        "versionType": "custom",
        "lessThanOrEqual": "*"
      }
    ],
    "packageName": "org.wso2.carbon.apimgt:org.wso2.carbon.apimgt.rest.api.util",
    "defaultStatus": "unknown"
  }
]
Related CVEs
CVE-2026-5430

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-5430 · Unrated

Multiple Products · Known exploited (CISA KEV)

Event
#1983 · Revision 1
Added to Heist Feed
Publisher date
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