p PatchFirst

CVE-2026-49284

CVE-2026-49284 · SimpleSAMLphp SP accepts a response from an unexpected IdP when unsigned `Response/InResponseTo` is combined with a signed assertion lacking `SubjectConfirmationData/InResponseTo`

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.1 · High · EPSS 0.2% · Fix available

Published
Updated

Stack: system · php

Affected products and versions

  • simplesamlphp

    Versions
    • < 2.4.7: Affected
    • >= 2.5.0-rc1, < 2.5.2: Affected

    No fix published

  • simplesamlphp Debian:12

    Versions
    • 1.19.7-1
    • 1.19.7-1+deb12u1
    • 1.19.7-1+deb12u2
    • 1.19.7-2
    • 2.1.8-0.1
    • 2.2.6-1
    • 2.3.11-1
    • 2.3.11-2
    • 2.4.8-1
    • 2.5.3.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • simplesamlphp Debian:14

    Versions
    • 1.10.0-1
    • 1.11.0-1
    • 1.12.0-1
    • 1.12.0~rc1-1
    • 1.12.0~rc2-1
    • 1.13.0-1
    • 1.13.1-1
    • 1.13.1-2
    • 1.13.2-1
    • 1.14.0-1
    • 1.14.1-1
    • 1.14.10-1
    • 1.14.11-1
    • 1.14.15-1
    • 1.14.2-1
    • 1.14.2-2
    • 1.14.3-1
    • 1.14.4-1
    • 1.14.5-1
    • 1.14.6-1
    • 1.14.7-1
    • 1.14.8-1
    • 1.14.9-1
    • 1.15.0-1
    • 1.15.1-1
    • 1.15.2-1
    • 1.15.3-1
    • 1.15.4-1
    • 1.16.0-1
    • 1.16.1-1
    • 1.16.2-1
    • 1.16.3-1
    • 1.17.0-1
    • 1.17.1-1
    • 1.17.2-1
    • 1.17.2-2
    • 1.17.3-1
    • 1.17.4-1
    • 1.17.5-1
    • 1.17.6-1
    • 1.17.6-2
    • 1.18.1-1
    • 1.18.4-1
    • 1.18.5-1
    • 1.18.6-1
    • 1.18.7-1
    • 1.18.8-1
    • 1.19.0-1
    • 1.19.1-1
    • 1.19.1-1.1
    • 1.19.6-1
    • 1.19.7-1
    • 1.19.7-2
    • 1.6.0-1
    • 1.6.1-1
    • 1.6.2-1
    • 1.6.3-1
    • 1.6.3-2
    • 1.6.3-3
    • 1.7.0-1
    • 1.7.0-2
    • 1.8.0-1
    • 1.8.1-1
    • 1.8.2-1
    • 1.9.0-1
    • 1.9.0~rc1-1
    • 1.9.0~rc2-1
    • 1.9.1-1
    • 1.9.2-1
    • 2.1.8-0.1
    • 2.2.6-1
    • 2.3.11-1
    • 2.3.11-2
    Affected ranges
    • ECOSYSTEM: < 2.4.8-1

    Update to 2.4.8-1

  • simplesamlphp/simplesamlphp Packagist

    Versions
    • v2.5.0
    • v2.5.1
    Affected ranges
    • ECOSYSTEM: ≥ 2.5.0, < 2.5.2

    Update to 2.5.2

  • simplesamlphp/simplesamlphp Packagist

    Versions
    • 1.16.0
    • 1.16.0-rc1
    • 1.16.1
    • 1.16.2
    • 1.16.3
    • 1.19.8
    • 1.19.9
    • 2.0.2
    • 2.0.3
    • 2.0.4
    • 2.0.4-alpha.1
    • 2.0.5
    • 2.1.0
    • 2.1.0-rc1
    • v1.12.0
    • v1.13.0
    • v1.13.0-rc1
    • v1.13.0-rc2
    • v1.13.1
    • v1.13.2
    • v1.14.0
    • v1.14.0-rc1
    • v1.14.1
    • v1.14.10
    • v1.14.11
    • v1.14.12
    • v1.14.13
    • v1.14.14
    • v1.14.15
    • v1.14.16
    • v1.14.17
    • v1.14.2
    • v1.14.3
    • v1.14.4
    • v1.14.5
    • v1.14.6
    • v1.14.7
    • v1.14.8
    • v1.14.9
    • v1.15.0
    • v1.15.0-rc1
    • v1.15.0-rc2
    • v1.15.0-rc3
    • v1.15.1
    • v1.15.2
    • v1.15.3
    • v1.15.4
    • v1.17.0
    • v1.17.0-rc1
    • v1.17.0-rc2
    • v1.17.0-rc3
    • v1.17.1
    • v1.17.2
    • v1.17.3
    • v1.17.4
    • v1.17.5
    • v1.17.6
    • v1.17.7
    • v1.17.8
    • v1.18.0
    • v1.18.0-rc1
    • v1.18.0-rc2
    • v1.18.1
    • v1.18.2
    • v1.18.3
    • v1.18.4
    • v1.18.5
    • v1.18.6
    • v1.18.7
    • v1.18.8
    • v1.19.0
    • v1.19.0-rc1
    • v1.19.1
    • v1.19.2
    • v1.19.3
    • v1.19.4
    • v1.19.5
    • v1.19.6
    • v1.19.7
    • v2.0.0
    • v2.0.0-beta.1
    • v2.0.0-beta.11
    • v2.0.0-beta.2
    • v2.0.0-beta.3
    • v2.0.0-beta.4
    • v2.0.0-beta99
    • v2.0.0-rc1
    • v2.0.0-rc2
    • v2.0.0-rc3
    • v2.0.1
    • v2.0.10
    • v2.0.11
    • v2.0.12
    • v2.0.13
    • v2.0.14
    • v2.0.15
    • v2.0.6
    • v2.0.7
    • v2.0.8
    • v2.0.9
    • v2.1.1
    • v2.1.2
    • v2.1.3
    • v2.1.4
    • v2.1.5
    • v2.1.6
    • v2.1.7
    • v2.1.8
    • v2.2.0
    • v2.2.1
    • v2.2.2
    • v2.2.3
    • v2.2.4
    • v2.2.5
    • v2.2.6
    • v2.3.0
    • v2.3.1
    • v2.3.10
    • v2.3.11
    • v2.3.2
    • v2.3.3
    • v2.3.4
    • v2.3.5
    • v2.3.6
    • v2.3.7
    • v2.3.8
    • v2.3.9
    • v2.4.0
    • v2.4.1
    • v2.4.2
    • v2.4.3
    • v2.4.4
    • v2.4.5
    • v2.4.6
    Affected ranges
    • ECOSYSTEM: < 2.4.7

    Update to 2.4.7

  • simplesamlphp Ubuntu:Pro:16.04:LTS

    Versions
    • 1.13.2-1
    • 1.14.0-1
    • 1.14.0-1ubuntu2
    • 1.14.0-1ubuntu2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • simplesamlphp Ubuntu:Pro:18.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • simplesamlphp Ubuntu:Pro:20.04:LTS

    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
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • simplesamlphp Ubuntu:Pro:22.04:LTS

    Versions
    • 1.19.1-1
    • 1.19.1-1.1
    • 1.19.1-1.1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • simplesamlphp Ubuntu:24.04:LTS

    Versions
    • 1.19.7-1
    • 1.19.7-1+deb12u1ubuntu0.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • simplesamlphp Ubuntu:26.10

    Versions
    • 1.19.7-2
    • 2.1.8-0.1
    • 2.2.6-1
    • 2.3.11-1
    • 2.3.11-2
    • 2.4.8-1
    • 2.5.3.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • simplesamlphp Ubuntu:26.04:LTS

    Versions
    • 1.19.7-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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