What’s Vulnerable › Vulnerabilities

CVE-2021-40691

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-09-29 · updated 2026-06-17

Description

A session hijack risk was identified in the Shibboleth authentication plugin.

Affected products

• Moodle: before 3.9.10; from 3.10.0 before 3.10.7; from 3.11.0 before 3.11.3 — fixed in 3.10.7, 3.11.3, 3.9.10

How to fix

Upgrade to a fixed version: Moodle 3.10.7, 3.11.3, 3.9.10. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=2043411
• https://bugzilla.redhat.com/show_bug.cgi?id=2043411

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