# Shibboleth OIDC OP plugin patched

Published: 2026-11-10 · Severity: routine · Sectors: Government (National), Education · Not tied to an actor or CVE
Canonical: https://vorant.io/reports/df8bf6c4-3c29-5cb0-8583-f41e830bc6d7/shibboleth-oidc-op-plugin-patched
Vorant's rating weighs the evidence in the report: confirmed exploitation, victims claimed, CVSS and EPSS, and how many sources agree. It rates the report, not your assets.

> CERT-FR advises patching the Shibboleth OpenID Connect OpenID Provider plugin before V4.3.3 to fix security policy bypass flaws.

Source: cert.cyber.gouv.fr — https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1491

## What to check

- Applies to: Not tied to a specific actor, malware or CVE, only to the sectors it covers, so it may be general reporting. Check the source before acting on it. Whether it concerns you is not assessed.

CERT-FR published an advisory describing multiple vulnerabilities in the OpenID Connect OpenID Provider (OIDC OP) plugin for Shibboleth, affecting all versions prior to V4.3.3. The vulnerabilities allow an attacker to bypass security policy controls, though the advisory does not specify further technical detail on the exploitation mechanics.

No evidence of active exploitation in the wild is mentioned in the advisory. Defenders running Shibboleth with the OIDC OP plugin should consult the referenced Shibboleth security bulletins (secadv_20261109 and secadv_20261109a, both dated 9 November 2026) and apply the available patches to upgrade to V4.3.3 or later.

Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1491

---

This is the free public brief from Vorant Threat Intelligence. When citing, attribute "Vorant" and link https://vorant.io/reports/df8bf6c4-3c29-5cb0-8583-f41e830bc6d7/shibboleth-oidc-op-plugin-patched.
The paid plans add the security research and news reporting the free tier leaves out. Slack alerts on the vendors, sectors and countries a reader follows come with the paid plans too. A new account starts with a three-day trial, no card: https://vorant.io/signup