Vulnerability-Lookup

CVE-2025-27773 (GCVE-0-2025-27773)

Vulnerability from cvelistv5 – Published: 2025-03-11 19:04 – Updated: 2025-05-09 20:03

Title

SimpleSAMLphp SAML2 library has incorrect signature verification for HTTP-Redirect binding

Summary

The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.17.0 and 5.0.0-alpha.20, there is a signature confusion attack in the HTTPRedirect binding. An attacker with any signed SAMLResponse via the HTTP-Redirect binding can cause the application to accept an unsigned message. Versions 4.17.0 and 5.0.0-alpha.20 contain a fix for the issue.

Severity

8.6 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-03-11 19:26 UTC

CWE

CWE-347 - Improper Verification of Cryptographic Signature

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 8035 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/simplesamlphp/saml2/security/a…	x_refsource_CONFIRM
https://github.com/simplesamlphp/saml2/commit/786…	x_refsource_MISC
https://github.com/simplesamlphp/saml2/blob/9545a…	x_refsource_MISC
https://github.com/simplesamlphp/saml2/blob/9545a…	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

1 product

Vendor	Product	Version	CPE status
simplesamlphp	saml2	Affected: < 4.17.0 Affected: >= 5.0.0-alpha.1, < 5.0.0-alpha.20	guessed

Show details on NVD website

JSON

To clipboard

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CERTFR-2025-AVI-0836

Vulnerability from certfr_avis - Published: 2025-10-01 - Updated: 2025-10-01

De multiples vulnérabilités ont été découvertes dans Tenable Security Center. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, une élévation de privilèges et un contournement de la politique de sécurité.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

	Vendor	Product	Description
	Tenable	Security Center	Security Center sans le correctif de sécurité Patch SC-202509.2

References

Title

Publication Time

FKIE_CVE-2025-27773

Vulnerability from fkie_nvd - Published: 2025-03-11 19:15 - Updated: 2026-06-17 09:04

Severity

8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L104-L113
	security-advisories@github.com	https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L178-L217
	security-advisories@github.com	https://github.com/simplesamlphp/saml2/commit/7867d6099dc7f31bed1ea10e5bea159c5623d2a0
	security-advisories@github.com	https://github.com/simplesamlphp/saml2/security/advisories/GHSA-46r4-f8gj-xg56
	af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/05/msg00013.html

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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            {
              "status": "affected",
              "version": "\u003c 4.17.0"
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            }
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    },
    {
      "lang": "es",
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    }
  ],
  "id": "CVE-2025-27773",
  "lastModified": "2026-06-17T09:04:11.953",
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          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-03-11T19:26:31.017558Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-03-11T19:15:43.677",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L104-L113"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L178-L217"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/simplesamlphp/saml2/commit/7867d6099dc7f31bed1ea10e5bea159c5623d2a0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/simplesamlphp/saml2/security/advisories/GHSA-46r4-f8gj-xg56"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00013.html"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-347"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-46R4-F8GJ-XG56

Vulnerability from github – Published: 2025-03-11 19:23 – Updated: 2025-05-09 21:31

Summary

The SimpleSAMLphp SAML2 library incorrectly verifies signatures for HTTP-Redirect binding

Details

Summary

There's a signature confusion attack in the HTTPRedirect binding. An attacker with any signed SAMLResponse via the HTTP-Redirect binding can cause the application to accept an unsigned message.

I believe that it exists for v4 only. I have not yet developed a PoC.

V5 is well designed and instead builds the signed query from the same message that will be consumed.

Details

What is verified

The data['SignedQuery'] is the string that will be verified by the public key.

It is defined here: https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L178-L217

THe code will iterate through each parameter name. Notably, sigQuery is overridden each time when processing, making the last of SAMLRequest/SAMLResponse used for sigQuery.

For example, given:

SAMLRequest=a&SAMLResponse=idpsigned

SAMLResponse=idpsigned will be set as sigQuery, then later verified

What is actually processed

Processing uses SAMLRequest parameter value first, (if it exists) then SAMLResponse:

https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L104-L113

Given this, the contents that are processed might not be the same as the data that is actually verified.

Exploiting

Suppose an attacker has a signed HTTP Redirect binding from IdP, say a signed logout response. :

SAMLResponse=idpsigned&RelayState=...&SigAlg=...&Signature

Then an attacker can append SAMLRequest in front:

SAMLRequest=unverifieddata&SAMLResponse=idpsigned&RelayState=...&SigAlg=...&Signature=..

SimpleSAMLPhp will only verify the SAMLResponse, but will actually use the SAMLRequest contents. The impact here is increased because there's no checks that SAMLRequest actually contains a Request, it could instead contain an Response, which allows the attacker to effectively impersonate any user within the SP.

IdPs

Microsoft Azure AD/Entra (and likely ADFS) signs the LogoutResponse via this SimpleSign format in HTTP Redirect binding. If an attacker logs out of Entra, they will be able to extract a valid Signature.

Attached is an HTTP Request when an I initiated a SLO request from the service provider to the IdP (entra). Then IdP POSTed this SAMLResponse with HTTP Redirect binding signature, via the user browser to the SP. It should be possible to carry out the described attack with this.

https://webhook.site/c6038292-6ef5-46ac-973d-d7c25520ec48/logout?SAMLResponse=fVJNa%2bMwEP0rRndZtmw5tnAMy%2fYSaC9N6aGXIsmjVMTRGI9M%2bvObdeihsPQ4w7x5HzM9mcs060c84ZqegWaMBNnhYc%2fejS1UW1TAnVU7XldK8s7JkcvOd60Db3zTsewVFgoY90zmBcsORCscIiUT061VyJqXJS%2fbl7LRUmrZ5mXdvLHsASiFaNKG%2fEhpJi3EFewH4jmnkEC4pqha2UnegFe8bozj3a4a%2bbhzUilZgKtbMW2yb7TxW%2foL7lkM9hTC2XnEOPvZXjDECb2N1lh7mvBsp%2bnsErDs8zJF0lsEe7YuUaOhQDqaC5BOTh%2f%2fPD3qmzE9L5jQ4cSGfrO43KG%2fgwwRLP8ssuHbIiXKryGOeKU8QhLSVN7WteejV8Bru%2bt4WynFbwE3bdVV5ahG0Ys759Dfj3VMJq30s%2fqLI2SvZlrhd020Tevj6hwQMTH04udS8b%2bHGL4A&Signature=Z%2f7gIPv7Gkgvqtwo0bzgXyum9IjHMfP0zTYuNbl%2fBUGlQ%2fU%2bbOZGZJ6Rk9wLUyvNQ5XlZRxZrfESNA%2bn0CVyIedsg9GxQKTi7VqPTJFJqEIP1BZaEpYYP3%2f6sFfLxfTMKecJoQdxnDE5Malte1hMj2UujWnLXOnp0CgO%2f%2fU2K52SoGckIzNDRB%2fJ6%2fysTn%2bDjBrmgdro%2fgdTyby9%2f3vm8dzY8pUkRCgMjlimShrZxr5U33wQvwPLIXlDgActr91RUtWKE0k8sy%2brshrK9DKLPo8AdTLk7NYhjSWdF7OG7uqgEeEo470tacqQuA09E0qDh8CWS%2bycLJijiGYWVyQa4Q%3d%3d&SigAlg=http%3a%2f%2fwww.w3.org%2f2001%2f04%2fxmldsig-more%23rsa-sha256

Severity

8.6 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.16.15"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "simplesamlphp/saml2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.17.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.0.0-alpha.19"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "simplesamlphp/saml2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0-alpha.1"
            },
            {
              "fixed": "5.0.0-alpha.20"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.16.15"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "simplesamlphp/saml2-legacy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.17.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-27773"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-03-11T19:23:22Z",
    "nvd_published_at": "2025-03-11T19:15:43Z",
    "severity": "HIGH"
  },
  "details": "### Summary\nThere\u0027s a signature confusion attack in the HTTPRedirect binding. An attacker with any signed SAMLResponse via the HTTP-Redirect binding can cause the application to accept an unsigned message.\n\nI believe that it exists for v4 only. I have not yet developed a PoC.\n\nV5 is well designed and instead builds the signed query from the same message that will be consumed.\n### Details\n\n#### What is verified\nThe data[\u0027SignedQuery\u0027] is the string that will be verified by the public key. \n\nIt is defined here:\nhttps://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L178-L217\n\nTHe code will iterate through each parameter name. Notably, sigQuery is overridden each time when processing, making the last of SAMLRequest/SAMLResponse used for sigQuery.\n\nFor example, given:\n\nSAMLRequest=a\u0026SAMLResponse=idpsigned\n\nSAMLResponse=idpsigned will be set as sigQuery, then later verified\n\n\n#### What is actually processed\n\nProcessing uses SAMLRequest parameter value first, (if it exists) then SAMLResponse:\n\nhttps://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L104-L113\n\nGiven this, the contents that are processed might not be the same as the data that is actually verified.\n\n\n### Exploiting\nSuppose an attacker has a signed HTTP Redirect binding from IdP, say a signed logout response. :\n\nSAMLResponse=idpsigned\u0026RelayState=...\u0026SigAlg=...\u0026Signature\n\n\nThen an attacker can append SAMLRequest in front:\n\n`SAMLRequest=unverifieddata\u0026SAMLResponse=idpsigned\u0026RelayState=...\u0026SigAlg=...\u0026Signature=..`\n\nSimpleSAMLPhp will only verify the SAMLResponse, but will actually use the SAMLRequest contents. The impact here is increased because there\u0027s no checks that SAMLRequest actually contains a Request, it could instead contain an Response, which allows the attacker to effectively impersonate any user within the SP.\n\n\n### IdPs\n\nMicrosoft Azure AD/Entra (and likely ADFS) signs the LogoutResponse via this SimpleSign format in HTTP Redirect binding. If an attacker logs out of Entra, they will be able to extract a valid Signature.\n\nAttached is an HTTP Request when an I initiated a SLO request from the service provider to the IdP (entra). Then IdP POSTed this SAMLResponse with HTTP Redirect binding signature, via the user browser to the SP. It should be possible to carry out the described attack with this.\n\n```\nhttps://webhook.site/c6038292-6ef5-46ac-973d-d7c25520ec48/logout?SAMLResponse=fVJNa%2bMwEP0rRndZtmw5tnAMy%2fYSaC9N6aGXIsmjVMTRGI9M%2bvObdeihsPQ4w7x5HzM9mcs060c84ZqegWaMBNnhYc%2fejS1UW1TAnVU7XldK8s7JkcvOd60Db3zTsewVFgoY90zmBcsORCscIiUT061VyJqXJS%2fbl7LRUmrZ5mXdvLHsASiFaNKG%2fEhpJi3EFewH4jmnkEC4pqha2UnegFe8bozj3a4a%2bbhzUilZgKtbMW2yb7TxW%2foL7lkM9hTC2XnEOPvZXjDECb2N1lh7mvBsp%2bnsErDs8zJF0lsEe7YuUaOhQDqaC5BOTh%2f%2fPD3qmzE9L5jQ4cSGfrO43KG%2fgwwRLP8ssuHbIiXKryGOeKU8QhLSVN7WteejV8Bru%2bt4WynFbwE3bdVV5ahG0Ys759Dfj3VMJq30s%2fqLI2SvZlrhd020Tevj6hwQMTH04udS8b%2bHGL4A\u0026Signature=Z%2f7gIPv7Gkgvqtwo0bzgXyum9IjHMfP0zTYuNbl%2fBUGlQ%2fU%2bbOZGZJ6Rk9wLUyvNQ5XlZRxZrfESNA%2bn0CVyIedsg9GxQKTi7VqPTJFJqEIP1BZaEpYYP3%2f6sFfLxfTMKecJoQdxnDE5Malte1hMj2UujWnLXOnp0CgO%2f%2fU2K52SoGckIzNDRB%2fJ6%2fysTn%2bDjBrmgdro%2fgdTyby9%2f3vm8dzY8pUkRCgMjlimShrZxr5U33wQvwPLIXlDgActr91RUtWKE0k8sy%2brshrK9DKLPo8AdTLk7NYhjSWdF7OG7uqgEeEo470tacqQuA09E0qDh8CWS%2bycLJijiGYWVyQa4Q%3d%3d\u0026SigAlg=http%3a%2f%2fwww.w3.org%2f2001%2f04%2fxmldsig-more%23rsa-sha256\n```",
  "id": "GHSA-46r4-f8gj-xg56",
  "modified": "2025-05-09T21:31:08Z",
  "published": "2025-03-11T19:23:22Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/simplesamlphp/saml2/security/advisories/GHSA-46r4-f8gj-xg56"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-27773"
    },
    {
      "type": "WEB",
      "url": "https://github.com/simplesamlphp/saml2/commit/7867d6099dc7f31bed1ea10e5bea159c5623d2a0"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/simplesamlphp/saml2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L104-L113"
    },
    {
      "type": "WEB",
      "url": "https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L178-L217"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00013.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "The SimpleSAMLphp SAML2 library incorrectly verifies signatures for HTTP-Redirect binding"
}

UBUNTU-CVE-2025-27773 (CVE-2025-27773)

Vulnerability from osv_ubuntu – Published: 2025-03-11 19:15 – Updated: 2026-09-15 17:38 – Source website

Details

Severity

8.6 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2025-27773	REPORT
	https://www.cve.org/CVERecord?id=CVE-2025-27773	REPORT
	https://github.com/simplesamlphp/saml2/security/a…	REPORT
	https://github.com/simplesamlphp/saml2/commit/786…	REPORT
	https://github.com/simplesamlphp/saml2/blob/9545a…	REPORT
	https://github.com/simplesamlphp/saml2/blob/9545a…	REPORT
	https://ubuntu.com/security/notices/USN-8770-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "simplesamlphp",
            "binary_version": "1.14.0-1ubuntu2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "simplesamlphp",
        "purl": "pkg:deb/ubuntu/simplesamlphp@1.14.0-1ubuntu2+esm1?arch=source\u0026distro=esm-apps-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.14.0-1ubuntu2+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.13.2-1",
        "1.14.0-1",
        "1.14.0-1ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "simplesamlphp",
            "binary_version": "1.15.3-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "simplesamlphp",
        "purl": "pkg:deb/ubuntu/simplesamlphp@1.15.3-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.15.3-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.14.15-1",
        "1.15.0-1",
        "1.15.1-1",
        "1.15.2-1",
        "1.15.3-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "simplesamlphp",
            "binary_version": "1.18.4-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "simplesamlphp",
        "purl": "pkg:deb/ubuntu/simplesamlphp@1.18.4-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.18.4-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.17.5-1",
        "1.17.6-1",
        "1.17.6-2",
        "1.18.1-1",
        "1.18.4-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "simplesamlphp",
            "binary_version": "1.19.1-1.1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "simplesamlphp",
        "purl": "pkg:deb/ubuntu/simplesamlphp@1.19.1-1.1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.19.1-1.1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.19.1-1",
        "1.19.1-1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "simplesamlphp",
            "binary_version": "1.19.7-1+deb12u1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "simplesamlphp",
        "purl": "pkg:deb/ubuntu/simplesamlphp@1.19.7-1+deb12u1ubuntu0.1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.19.7-1+deb12u1ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.19.7-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "simplesamlphp",
            "binary_version": "1.19.7-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "simplesamlphp",
        "purl": "pkg:deb/ubuntu/simplesamlphp@1.19.7-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.19.7-1+deb12u1",
        "1.19.7-2"
      ]
    }
  ],
  "aliases": [],
  "details": "The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.17.0 and 5.0.0-alpha.20, there is a signature confusion attack in the HTTPRedirect binding. An attacker with any signed SAMLResponse via the HTTP-Redirect binding can cause the application to accept an unsigned message. Versions 4.17.0 and 5.0.0-alpha.20 contain a fix for the issue.",
  "id": "UBUNTU-CVE-2025-27773",
  "modified": "2026-09-15T17:38:38Z",
  "published": "2025-03-11T19:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-27773"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-27773"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/simplesamlphp/saml2/security/advisories/GHSA-46r4-f8gj-xg56"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/simplesamlphp/saml2/commit/7867d6099dc7f31bed1ea10e5bea159c5623d2a0"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L104-L113"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/simplesamlphp/saml2/blob/9545abd0d9d48388f2fa00469c5c1e0294f0303e/src/SAML2/HTTPRedirect.php#L178-L217"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8770-1"
    }
  ],
  "related": [
    "USN-8770-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2025-27773"
  ]
}

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.

Vulnerability timeline

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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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2025-27773 (GCVE-0-2025-27773)

CERTFR-2025-AVI-0836

Solutions

FKIE_CVE-2025-27773

GHSA-46R4-F8GJ-XG56

Summary

Details

What is verified

What is actually processed

Exploiting

IdPs

UBUNTU-CVE-2025-27773 (CVE-2025-27773)

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Vulnerability timeline

Related by attack behaviour