Vulnerability-Lookup

CVE-2026-49284 (GCVE-0-2026-49284)

Vulnerability from cvelistv5 – Published: 2026-07-17 19:17 – Updated: 2026-07-20 19:22

Title

SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`

Summary

SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.

Severity

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-20 19:21 UTC

CWE

CWE-345 - Insufficient Verification of Data Authenticity

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/simplesamlphp/simplesamlphp/se…	x_refsource_CONFIRM
https://github.com/simplesamlphp/simplesamlphp/re…	x_refsource_MISC
https://github.com/simplesamlphp/simplesamlphp/re…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
simplesamlphp	simplesamlphp	Affected: < 2.4.7 Affected: >= 2.5.0-rc1, < 2.5.2	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-49284

Vulnerability from fkie_nvd - Published: 2026-07-17 20:17 - Updated: 2026-07-30 13:39

Severity

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

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/simplesamlphp/simplesamlphp/releases/tag/v2.4.7	Product, Release Notes
security-advisories@github.com	https://github.com/simplesamlphp/simplesamlphp/releases/tag/v2.5.2	Product, Release Notes
security-advisories@github.com	https://github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-q8r6-xj3f-wrrm	Vendor Advisory

Impacted products

	Vendor	Product	Version
	simplesamlphp	simplesamlphp	*
	simplesamlphp	simplesamlphp	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "simplesamlphp",
          "vendor": "simplesamlphp",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.4.7"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.5.0-rc1, \u003c 2.5.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
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    }
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  "id": "CVE-2026-49284",
  "lastModified": "2026-07-30T13:39:25.117",
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GHSA-Q8R6-XJ3F-WRRM

Vulnerability from github – Published: 2026-07-02 20:47 – Updated: 2026-07-02 20:47

Summary

SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`

Details

Summary

SimpleSAMLphp's SAML SP ACS path does not enforce the IdP selected for an SP-initiated login. If a saved SP state contains ExpectedIssuer = IdP A, but the ACS receives a valid response from IdP B, the code logs a warning and continues processing instead of rejecting the response.

That behavior becomes security-relevant when combined with the response-processing rule that accepts an unsigned samlp:Response/@InResponseTo outside the signed assertion whenever the signed assertion's SubjectConfirmationData does not carry its own InResponseTo. A response issued by one trusted IdP can therefore be bound to SP state created for another IdP.

Impact

In a multi-IdP deployment, a lower-trust IdP can satisfy SP state created for a different expected IdP. This can bypass an SP flow that intentionally routes the user to a specific IdP, including deployments that set enable_unsolicited to false to prevent IdP-initiated logins.

The impact is highest when the SP trusts multiple IdPs with different assurance levels, tenant boundaries, or attribute namespaces, and application authorization depends on the selected/expected IdP. In those deployments this is an authentication/authorization bypass candidate. Impact strongly depends on whether an attacker can obtain a signed IdP-initiated assertion from a lower-trust trusted IdP and whether the downstream application maps identifiers globally.

Severity

7.1 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.5.1"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "simplesamlphp/simplesamlphp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.5.0"
            },
            {
              "fixed": "2.5.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.4.6"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "simplesamlphp/simplesamlphp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-49284"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-345"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-02T20:47:21Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nSimpleSAMLphp\u0027s SAML SP ACS path does not enforce the IdP selected for an SP-initiated login. If a saved SP state contains `ExpectedIssuer = IdP A`, but the ACS receives a valid response from `IdP B`, the code logs a warning and continues processing instead of rejecting the response.\n\nThat behavior becomes security-relevant when combined with the response-processing rule that accepts an unsigned `samlp:Response/@InResponseTo` outside the signed assertion whenever the signed assertion\u0027s `SubjectConfirmationData` does not carry its own `InResponseTo`. A response issued by one trusted IdP can therefore be bound to SP state created for another IdP.\n\n## Impact\n\nIn a multi-IdP deployment, a lower-trust IdP can satisfy SP state created for a different expected IdP. This can bypass an SP flow that intentionally routes the user to a specific IdP, including deployments that set `enable_unsolicited` to `false` to prevent IdP-initiated logins.\n\nThe impact is highest when the SP trusts multiple IdPs with different assurance levels, tenant boundaries, or attribute namespaces, and application authorization depends on the selected/expected IdP. In those deployments this is an authentication/authorization bypass candidate. Impact strongly depends on whether an attacker can obtain a signed IdP-initiated assertion from a lower-trust trusted IdP and whether the downstream application maps identifiers globally.",
  "id": "GHSA-q8r6-xj3f-wrrm",
  "modified": "2026-07-02T20:47:21Z",
  "published": "2026-07-02T20:47:21Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-q8r6-xj3f-wrrm"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/simplesamlphp/simplesamlphp"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`"
}

NCSC-2026-0375

Vulnerability from csaf_ncscnl - Published: 2026-09-16 13:52 - Updated: 2026-09-16 13:52

Summary

Kwetsbaarheden verholpen in Oracle Communications

Scope

31 vulnerabilities in this advisory, including CVE-2026-49284.

CVE-2026-49284

SimpleSAMLphp versions prior to 2.4.7, 2.5.2, and 1.18.6 have vulnerabilities in the SP ACS path that allow acceptance of SAML responses from unexpected IdPs, leading to authentication bypass and information disclosure, with Oracle Communications Unified Assurance 6.1.1 to 7.0.0 also affected by unauthorized data access via SimpleSAMLphp.

7.1 (High)


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

Known affected: 6 products

Open the full advisory

ubuntu-cve-2026-49284

Vulnerability from osv_ubuntu

Published

2026-07-17 20:17

Modified

2026-09-15 17:47

Summary

Details

Severity

7.1 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-49284	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-49284	REPORT
	https://github.com/simplesamlphp/simplesamlphp/se…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.13.2-1",
        "1.14.0-1",
        "1.14.0-1ubuntu2",
        "1.14.0-1ubuntu2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.14.15-1",
        "1.15.0-1",
        "1.15.1-1",
        "1.15.2-1",
        "1.15.3-1",
        "1.15.3-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.17.5-1",
        "1.17.6-1",
        "1.17.6-2",
        "1.18.1-1",
        "1.18.4-1",
        "1.18.4-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.19.1-1",
        "1.19.1-1.1",
        "1.19.1-1.1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.19.7-1",
        "1.19.7-1+deb12u1ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "simplesamlphp",
            "binary_version": "1.19.7-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "simplesamlphp",
        "purl": "pkg:deb/ubuntu/simplesamlphp@1.19.7-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.19.7-2"
      ]
    }
  ],
  "aliases": [],
  "details": "SimpleSAMLphp versions before 1.18.6 contain an information disclosure vulnerability. Prior to 2.4.7 and 2.5.2, SimpleSAMLphp\u0027s SAML SP ACS path does not enforce the IdP selected for an SP-initiated login when unsigned Response/InResponseTo is combined with a signed assertion lacking SubjectConfirmationData/InResponseTo, allowing a response issued by one trusted IdP to be bound to SP state created for another IdP and bypass flows that route users to a specific IdP, including deployments that set enable_unsolicited to false. This issue is fixed in versions 2.4.7 and 2.5.2.",
  "id": "UBUNTU-CVE-2026-49284",
  "modified": "2026-09-15T17:47:33Z",
  "published": "2026-07-17T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-49284"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-49284"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/simplesamlphp/simplesamlphp/security/advisories/GHSA-q8r6-xj3f-wrrm"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-49284"
  ]
}

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.

Detection rules are retrieved from Rulezet.

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-2026-49284 (GCVE-0-2026-49284)

FKIE_CVE-2026-49284

GHSA-Q8R6-XJ3F-WRRM

Summary

Impact

NCSC-2026-0375

ubuntu-cve-2026-49284

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour