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    2 vulnerabilities by litesaml

    CVE-2026-63182 (GCVE-0-2026-63182)

    Vulnerability from nvd – Published: 2026-10-30 21:46 – Updated: 2026-10-30 21:46
    VLAI
    Title
    LightSAML: Signature reference wrapping permits unsigned assertion claims
    Summary
    LightSAML implements SAML 2.0 data model classes, XML serialization and deserialization, XML security, certificate support, and message bindings. Prior to 4.7.1 and 5.0.1, LightSAML and xmlseclibs disagree about which assertion an inbound SAML signature covers. `Response::deserialize` uses `manyElementsFromXml` to collect only direct-child `saml:Assertion` elements of `samlp:Response`, and `AssertionSignatureValidatorAction` validates their `ds:Signature` using an out-of-band trusted IdP credential resolved by Issuer, not a key from the document. `XMLSecurityDSig::validateReference()` removes the enveloped signature from the shared DOM, but `processRefNode()` resolves `Reference URI="#id"` document-wide through an XPath of the form `//*[@Id]` and takes `item(0)`, which need not be the assertion whose claims LightSAML consumes. An attacker who has captured one genuinely signed assertion, such as an earlier login response, can place its signature-stripped bytes earlier in `samlp:Extensions` and present a forged direct-child assertion with the same ID and copied genuine signature. Validation then covers the hidden genuine bytes while LightSAML surfaces unsigned attacker-controlled `Subject/NameID`, `Conditions`, and `Attributes`, enabling authentication bypass or privilege escalation even when signature validation is required. The behavior was confirmed in versions 5.0.0 and 4.6.1. This issue is fixed in versions 4.7.1 and 5.0.1.
    Severity
    8.1 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
    CWE
    • CWE-347 - Improper Verification of Cryptographic Signature
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7886 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    litesaml lightsaml Affected: < 4.7.1
    Affected: >= 5.0.0, < 5.0.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "lightsaml",
          "vendor": "litesaml",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.7.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 5.0.0, \u003c 5.0.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "LightSAML implements SAML 2.0 data model classes, XML serialization and deserialization, XML security, certificate support, and message bindings. Prior to 4.7.1 and 5.0.1, LightSAML and xmlseclibs disagree about which assertion an inbound SAML signature covers. `Response::deserialize` uses `manyElementsFromXml` to collect only direct-child `saml:Assertion` elements of `samlp:Response`, and `AssertionSignatureValidatorAction` validates their `ds:Signature` using an out-of-band trusted IdP credential resolved by Issuer, not a key from the document. `XMLSecurityDSig::validateReference()` removes the enveloped signature from the shared DOM, but `processRefNode()` resolves `Reference URI=\"#id\"` document-wide through an XPath of the form `//*[@Id]` and takes `item(0)`, which need not be the assertion whose claims LightSAML consumes. An attacker who has captured one genuinely signed assertion, such as an earlier login response, can place its signature-stripped bytes earlier in `samlp:Extensions` and present a forged direct-child assertion with the same ID and copied genuine signature. Validation then covers the hidden genuine bytes while LightSAML surfaces unsigned attacker-controlled `Subject/NameID`, `Conditions`, and `Attributes`, enabling authentication bypass or privilege escalation even when signature validation is required. The behavior was confirmed in versions 5.0.0 and 4.6.1. This issue is fixed in versions 4.7.1 and 5.0.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "CWE-347: Improper Verification of Cryptographic Signature",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T21:46:38.551Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/litesaml/lightsaml/security/advisories/GHSA-w553-pwx6-3mg9",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/litesaml/lightsaml/security/advisories/GHSA-w553-pwx6-3mg9"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/pull/113",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/pull/113"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/pull/122",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/pull/122"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/commit/230e62d1325f2cbcaac814b78409775f7a8806a2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/commit/230e62d1325f2cbcaac814b78409775f7a8806a2"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/commit/3af82bf2f3865e6aafeeb1a97c97b383b8bb7b00",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/commit/3af82bf2f3865e6aafeeb1a97c97b383b8bb7b00"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/releases/tag/4.7.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/releases/tag/4.7.1"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/releases/tag/5.0.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/releases/tag/5.0.1"
        }
      ],
      "source": {
        "advisory": "GHSA-w553-pwx6-3mg9",
        "discovery": "UNKNOWN"
      },
      "title": "LightSAML: Signature reference wrapping permits unsigned assertion claims"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63182",
    "datePublished": "2026-10-30T21:46:38.551Z",
    "dateReserved": "2026-07-15T22:13:00.721Z",
    "dateUpdated": "2026-10-30T21:46:38.551Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-63182 (GCVE-0-2026-63182)

    Vulnerability from cvelistv5 – Published: 2026-10-30 21:46 – Updated: 2026-10-30 21:46
    VLAI
    Title
    LightSAML: Signature reference wrapping permits unsigned assertion claims
    Summary
    LightSAML implements SAML 2.0 data model classes, XML serialization and deserialization, XML security, certificate support, and message bindings. Prior to 4.7.1 and 5.0.1, LightSAML and xmlseclibs disagree about which assertion an inbound SAML signature covers. `Response::deserialize` uses `manyElementsFromXml` to collect only direct-child `saml:Assertion` elements of `samlp:Response`, and `AssertionSignatureValidatorAction` validates their `ds:Signature` using an out-of-band trusted IdP credential resolved by Issuer, not a key from the document. `XMLSecurityDSig::validateReference()` removes the enveloped signature from the shared DOM, but `processRefNode()` resolves `Reference URI="#id"` document-wide through an XPath of the form `//*[@Id]` and takes `item(0)`, which need not be the assertion whose claims LightSAML consumes. An attacker who has captured one genuinely signed assertion, such as an earlier login response, can place its signature-stripped bytes earlier in `samlp:Extensions` and present a forged direct-child assertion with the same ID and copied genuine signature. Validation then covers the hidden genuine bytes while LightSAML surfaces unsigned attacker-controlled `Subject/NameID`, `Conditions`, and `Attributes`, enabling authentication bypass or privilege escalation even when signature validation is required. The behavior was confirmed in versions 5.0.0 and 4.6.1. This issue is fixed in versions 4.7.1 and 5.0.1.
    Severity
    8.1 (High)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
    CWE
    • CWE-347 - Improper Verification of Cryptographic Signature
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 7886 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    litesaml lightsaml Affected: < 4.7.1
    Affected: >= 5.0.0, < 5.0.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "lightsaml",
          "vendor": "litesaml",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 4.7.1"
            },
            {
              "status": "affected",
              "version": "\u003e= 5.0.0, \u003c 5.0.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "LightSAML implements SAML 2.0 data model classes, XML serialization and deserialization, XML security, certificate support, and message bindings. Prior to 4.7.1 and 5.0.1, LightSAML and xmlseclibs disagree about which assertion an inbound SAML signature covers. `Response::deserialize` uses `manyElementsFromXml` to collect only direct-child `saml:Assertion` elements of `samlp:Response`, and `AssertionSignatureValidatorAction` validates their `ds:Signature` using an out-of-band trusted IdP credential resolved by Issuer, not a key from the document. `XMLSecurityDSig::validateReference()` removes the enveloped signature from the shared DOM, but `processRefNode()` resolves `Reference URI=\"#id\"` document-wide through an XPath of the form `//*[@Id]` and takes `item(0)`, which need not be the assertion whose claims LightSAML consumes. An attacker who has captured one genuinely signed assertion, such as an earlier login response, can place its signature-stripped bytes earlier in `samlp:Extensions` and present a forged direct-child assertion with the same ID and copied genuine signature. Validation then covers the hidden genuine bytes while LightSAML surfaces unsigned attacker-controlled `Subject/NameID`, `Conditions`, and `Attributes`, enabling authentication bypass or privilege escalation even when signature validation is required. The behavior was confirmed in versions 5.0.0 and 4.6.1. This issue is fixed in versions 4.7.1 and 5.0.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "CWE-347: Improper Verification of Cryptographic Signature",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T21:46:38.551Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/litesaml/lightsaml/security/advisories/GHSA-w553-pwx6-3mg9",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/litesaml/lightsaml/security/advisories/GHSA-w553-pwx6-3mg9"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/pull/113",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/pull/113"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/pull/122",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/pull/122"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/commit/230e62d1325f2cbcaac814b78409775f7a8806a2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/commit/230e62d1325f2cbcaac814b78409775f7a8806a2"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/commit/3af82bf2f3865e6aafeeb1a97c97b383b8bb7b00",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/commit/3af82bf2f3865e6aafeeb1a97c97b383b8bb7b00"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/releases/tag/4.7.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/releases/tag/4.7.1"
        },
        {
          "name": "https://github.com/litesaml/lightsaml/releases/tag/5.0.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/litesaml/lightsaml/releases/tag/5.0.1"
        }
      ],
      "source": {
        "advisory": "GHSA-w553-pwx6-3mg9",
        "discovery": "UNKNOWN"
      },
      "title": "LightSAML: Signature reference wrapping permits unsigned assertion claims"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-63182",
    "datePublished": "2026-10-30T21:46:38.551Z",
    "dateReserved": "2026-07-15T22:13:00.721Z",
    "dateUpdated": "2026-10-30T21:46:38.551Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}