Improper Certificate Validation in Shibboleth Identity Provider and OpenSAML

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

not scored

EPSS

• CVE-2015-1796: 1.25% estimated exploitation activity in the next 30 days; percentile 69.37 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

The PKIX trust engines in Shibboleth Identity Provider before 2.4.4 and OpenSAML Java (OpenSAML-J) before 2.6.5 trust candidate X.509 credentials when no trusted names are available for the entityID, which allows remote attackers to impersonate an entity via a certificate issued by a shibmd:KeyAuthority trust anchor.

Published by the source

17 May 2022, 03:38 UTC

Last modified by the source

27 Jan 2023, 05:02 UTC

Source last checked

26 Oct 2026, 15:59 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-78fq-w796-q537

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# Patch Next advisory brief: CVE-2015-1796

Advisory: Improper Certificate Validation in Shibboleth Identity Provider and OpenSAML
IDs: CVE-2015-1796, GHSA-78fq-w796-q537
Record: https://patchnext.com/advisories/cve-2015-1796 (revision 1, source checked 26 Oct 2026, 15:59 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: edu.internet2.middleware:shibboleth-identityprovider 2.4.4; org.opensaml:opensaml 2.6.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven edu.internet2.middleware:shibboleth-identityprovider: affected <= 2.4.3; fixed in 2.4.4
- Maven org.opensaml:opensaml: affected <= 2.6.4; fixed in 2.6.5

## Suggested inspection (read-only)
- Maven edu.internet2.middleware:shibboleth-identityprovider: check the installed version with your package manager.
- Maven org.opensaml:opensaml: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on edu.internet2.middleware:shibboleth-identityprovider, org.opensaml:opensaml.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-78fq-w796-q537 (GitHub-reviewed advisory GHSA-78fq-w796-q537 lists affected ranges: Maven org.opensaml:opensaml >=0 =0 <=2.4.3)

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