Vulnerability-Lookup

GHSA-PM7G-W2CF-Q238

Vulnerability from github – Published: 2026-03-05 00:31 – Updated: 2026-03-05 00:31

Details

pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3 contain an authentication bypass vulnerability in JwtAuthenticator when processing encrypted JWTs that allows remote attackers to forge authentication tokens. Attackers who possess the server's RSA public key can create a JWE-wrapped PlainJWT with arbitrary subject and role claims, bypassing signature verification to authenticate as any user including administrators.

Severity ?

10.0 (Critical)


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

10.0 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-29000"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-04T22:16:18Z",
    "severity": "CRITICAL"
  },
  "details": "pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3 contain an authentication bypass vulnerability in JwtAuthenticator when processing encrypted JWTs that allows remote attackers to forge authentication tokens. Attackers who possess the server\u0027s RSA public key can create a JWE-wrapped PlainJWT with arbitrary subject and role claims, bypassing signature verification to authenticate as any user including administrators.",
  "id": "GHSA-pm7g-w2cf-q238",
  "modified": "2026-03-05T00:31:11Z",
  "published": "2026-03-05T00:31:11Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29000"
    },
    {
      "type": "WEB",
      "url": "https://www.codeant.ai/security-research/pac4j-jwt-authentication-bypass-public-key"
    },
    {
      "type": "WEB",
      "url": "https://www.pac4j.org/blog/security-advisory-pac4j-jwt-jwtauthenticator.html"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/pac4j-jwt-jwtauthenticator-authentication-bypass"
    }
  ],
  "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:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-29000 (GCVE-0-2026-29000)

Vulnerability from cvelistv5 – Published: 2026-03-04 21:49 – Updated: 2026-03-04 22:18

Title

pac4j-jwt JwtAuthenticator Authentication Bypass

Summary

Severity ?

10 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L

10 (Critical)


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

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

VulnCheck

References

URL

Tags

	https://www.pac4j.org/blog/security-advisory-pac4…	vendor-advisory
	https://www.codeant.ai/security-research/pac4j-jw…	technical-descriptionexploit
	https://www.vulncheck.com/advisories/pac4j-jwt-jw…	third-party-advisory

Impacted products

	Vendor	Product	Version
	pac4j	pac4j-jwt	Affected: 4.0 , < 4.5.9 (semver) Affected: 5.0 , < 5.7.9 (semver) Affected: 6.0 , < 6.3.3 (semver)

Credits

CodeAnt AI Security

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "pac4j-jwt",
          "repo": "https://github.com/pac4j/pac4j",
          "vendor": "pac4j",
          "versions": [
            {
              "lessThan": "4.5.9",
              "status": "affected",
              "version": "4.0",
              "versionType": "semver"
            },
            {
              "lessThan": "5.7.9",
              "status": "affected",
              "version": "5.0",
              "versionType": "semver"
            },
            {
              "lessThan": "6.3.3",
              "status": "affected",
              "version": "6.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.5.9",
                  "versionStartIncluding": "4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.7.9",
                  "versionStartIncluding": "5.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.3.3",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "CodeAnt AI Security"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
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              "base64": false,
              "type": "text/html",
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            }
          ],
          "value": "pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3 contain an authentication bypass vulnerability in JwtAuthenticator when processing encrypted JWTs that allows remote attackers to forge authentication tokens. Attackers who possess the server\u0027s RSA public key can create a JWE-wrapped PlainJWT with arbitrary subject and role claims, bypassing signature verification to authenticate as any user including administrators."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
            }
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        },
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            "availabilityImpact": "LOW",
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "CWE-347 Improper Verification of Cryptographic Signature",
              "lang": "en",
              "type": "CWE"
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          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-04T22:18:27.284Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "tags": [
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          ],
          "url": "https://www.pac4j.org/blog/security-advisory-pac4j-jwt-jwtauthenticator.html"
        },
        {
          "tags": [
            "technical-description",
            "exploit"
          ],
          "url": "https://www.codeant.ai/security-research/pac4j-jwt-authentication-bypass-public-key"
        },
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/pac4j-jwt-jwtauthenticator-authentication-bypass"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "pac4j-jwt JwtAuthenticator Authentication Bypass",
      "x_generator": {
        "engine": "Vulnogram 0.5.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-29000",
    "datePublished": "2026-03-04T21:49:29.340Z",
    "dateReserved": "2026-03-03T16:42:01.012Z",
    "dateUpdated": "2026-03-04T22:18:27.284Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-PM7G-W2CF-Q238

CVE-2026-29000 (GCVE-0-2026-29000)

Tags

Sightings

Nomenclature