Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| simplesamlphp | simplesamlphp | < 2.4.7, >= 2.5.0-rc1, < 2.5.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | simplesamlphp | 2.4.8-1 | — |
| Debian 12 | simplesamlphp | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | simplesamlphp | No fix yet | — |
| Ubuntu 26.04 LTS | simplesamlphp | No fix yet | — |
| Ubuntu 24.04 LTS | simplesamlphp | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | simplesamlphp | No fix yet | — |
| Ubuntu Pro 20.04 LTS | simplesamlphp | No fix yet | — |
| Ubuntu Pro 18.04 LTS | simplesamlphp | No fix yet | — |
| Ubuntu Pro 16.04 LTS | simplesamlphp | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Packagist | simplesamlphp/simplesamlphp | >= 2.5.0, < 2.5.2 | 2.5.2 | GHSA-q8r6-xj3f-wrrm |
| Packagist | simplesamlphp/simplesamlphp | < 2.4.7 | 2.4.7 | GHSA-q8r6-xj3f-wrrm |
Advisories 2
- WID-SEC-2026-3403 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 24, 2026
- NCSC-2026-0375 Kwetsbaarheden verholpen in Oracle Communications NCSC-NL (Netherlands) · Sep 16, 2026