DEBIAN-CVE-2026-49283

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Source

https://security-tracker.debian.org/tracker/CVE-2026-49283

Import Source

https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49283.json

JSON Data

https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-49283

Upstream

CVE-2026-49283

Published

2026-08-19T15:17:07Z

Modified

2026-09-19T22:47:40Z

Severity

8.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N CVSS Calculator

Summary

[none]

Details

The SimpleSAMLphp SAML2 library is a PHP library for SAML2 related functionality. Prior to versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1, the HTTPArtifact::receive() flow can treat an unsigned embedded SAML Response as cryptographically valid for the wrong identity provider. SOAPClient::addSSLValidator() attaches a TLS-based validator to the outer SOAP ArtifactResponse, while the embedded Response receives a validator that delegates to the outer message and is later checked against metadata selected from the embedded response issuer rather than necessarily the artifact issuer. SOAPClient::validateSSL() returns normally when the TLS public key does not match the key being validated, and SAML2\Message::validate() treats a validator call that does not throw as successful. In a multi-IdP federation, a malicious or lower-trust IdP can therefore provide an ArtifactResponse containing an unsigned Response that claims a higher-trust victim IdP as issuer and authenticate as arbitrary users with attacker-chosen assertion attributes, NameID, and session data. This issue is fixed in versions 4.19.3, 4.20.2, 5.0.6, and 6.2.1.

References

https://security-tracker.debian.org/tracker/CVE-2026-49283

Affected packages

Debian:12 / simplesamlphp

Package

Name: simplesamlphp
Purl: pkg:deb/debian/simplesamlphp?arch=source&distro=bookworm

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

1.19.7-1

1.19.7-1+deb12u1

1.19.7-1+deb12u2

1.19.7-2

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

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49283.json"

Debian:14 / simplesamlphp

Package

Name: simplesamlphp
Purl: pkg:deb/debian/simplesamlphp?arch=source&distro=forky

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

1.*

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~rc1-1

1.9.0~rc2-1

1.9.0-1

1.9.1-1

1.9.2-1

1.10.0-1

1.11.0-1

1.12.0~rc1-1

1.12.0~rc2-1

1.12.0-1

1.13.0-1

1.13.1-1

1.13.1-2

1.13.2-1

1.14.0-1

1.14.1-1

1.14.2-1

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

1.14.10-1

1.14.11-1

1.14.15-1

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