FKIE_CVE-2026-123802

Vulnerability from fkie_nvd - Published: 2026-11-09 19:16 - Updated: 2026-11-12 22:18
Severity
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Summary
SuperTokens Core is an open source authentication server. From 11.3.0 until 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1, a licensed deployment with a configured SAML client can authenticate an identity from an assertion that did not satisfy the audience check. When the identity provider uses assertion-level signing, an attacker who has a still-valid IdP-signed assertion naming the victim for any audience and the attacker's own valid assertion for the target audience can combine them because validateSamlResponseAudience accepts an audience from one assertion while extractAllClaims takes the final NameID and attributes from another; response-level signing does not expose this multi-assertion variant. Independently, an assertion from an identity provider configured for the target deployment but issued to another SuperTokens deployment using the shared default saml_sp_entity_id can satisfy the target's audience check. Successful exploitation authenticates the attacker as the victim IdP user. This issue is fixed in versions 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1.
References
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/commit/00a15e045323ba8a566ca6f59b70125b4030ab6c
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/commit/1645915320c5dfc22bce9029eb7d8364f8df402f
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/commit/1d0fd5b40848629295cf86d47be185f92f31e445
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/commit/324686349b21ab46fe465ca5f74294d6c68d3859
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/commit/53f42f496477e7cc3ccd48fe57851fa08d06a248
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/commit/5ffdd887b470035f409d61f85f2186381ad9cdd6
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/commit/8e69a85e38709b832869c3bfc83df9a150d6f3cf
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/commit/a2483b692d43294fdb9ad2f8f6f831cca8300081
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/commit/b21760ceb5089b0fa30c8fd46f7bbfc680de56dd
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/commit/c77b13061176d9bd50ed24a9cf50ffbcdf332ee5
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/commit/f4ddc022ef1ee17933efb710c21a960cb4ada083
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/releases/tag/v11.3.8
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/releases/tag/v11.4.8
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/releases/tag/v12.0.11
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/releases/tag/v12.1.2
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/releases/tag/v12.2.1
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/releases/tag/v12.3.1
security-advisories@github.comhttps://github.com/supertokens/supertokens-core/security/advisories/GHSA-wfg2-vqfg-rqh6
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "supertokens-core",
          "vendor": "supertokens",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 11.3.0, \u003c 11.3.8"
            },
            {
              "status": "affected",
              "version": "\u003e= 11.4.0, \u003c 11.4.8"
            },
            {
              "status": "affected",
              "version": "\u003e= 12.0.0, \u003c 12.0.11"
            },
            {
              "status": "affected",
              "version": "\u003e= 12.1.0, \u003c 12.1.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 12.2.0, \u003c 12.2.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 12.3.0, \u003c 12.3.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "SuperTokens Core is an open source authentication server. From 11.3.0 until 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1, a licensed deployment with a configured SAML client can authenticate an identity from an assertion that did not satisfy the audience check. When the identity provider uses assertion-level signing, an attacker who has a still-valid IdP-signed assertion naming the victim for any audience and the attacker\u0027s own valid assertion for the target audience can combine them because validateSamlResponseAudience accepts an audience from one assertion while extractAllClaims takes the final NameID and attributes from another; response-level signing does not expose this multi-assertion variant. Independently, an assertion from an identity provider configured for the target deployment but issued to another SuperTokens deployment using the shared default saml_sp_entity_id can satisfy the target\u0027s audience check. Successful exploitation authenticates the attacker as the victim IdP user. This issue is fixed in versions 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1."
    }
  ],
  "id": "CVE-2026-123802",
  "lastModified": "2026-11-12T22:18:51.470",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-11-09T19:16:47.083",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/commit/00a15e045323ba8a566ca6f59b70125b4030ab6c"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/commit/1645915320c5dfc22bce9029eb7d8364f8df402f"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/commit/1d0fd5b40848629295cf86d47be185f92f31e445"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/commit/324686349b21ab46fe465ca5f74294d6c68d3859"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/commit/53f42f496477e7cc3ccd48fe57851fa08d06a248"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/commit/5ffdd887b470035f409d61f85f2186381ad9cdd6"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/commit/8e69a85e38709b832869c3bfc83df9a150d6f3cf"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/commit/a2483b692d43294fdb9ad2f8f6f831cca8300081"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/commit/b21760ceb5089b0fa30c8fd46f7bbfc680de56dd"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/commit/c77b13061176d9bd50ed24a9cf50ffbcdf332ee5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/commit/f4ddc022ef1ee17933efb710c21a960cb4ada083"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/releases/tag/v11.3.8"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/releases/tag/v11.4.8"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/releases/tag/v12.0.11"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/releases/tag/v12.1.2"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/releases/tag/v12.2.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/releases/tag/v12.3.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/supertokens/supertokens-core/security/advisories/GHSA-wfg2-vqfg-rqh6"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        },
        {
          "lang": "en",
          "value": "CWE-345"
        },
        {
          "lang": "en",
          "value": "CWE-1220"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}



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