CERT-FR Flags Moodle Security Bypass Flaw
A security policy bypass vulnerability affects multiple Moodle versions; patches are available and should be applied.
Sourcecert.cyber.gouv.fr — open the original
What to check
- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
CERT-FR has published an advisory regarding a vulnerability in Moodle, the widely-used open-source learning management system. The flaw, tracked as CVE-2026-123655, allows an attacker to bypass security policy controls within affected Moodle installations. The advisory does not specify the exact mechanism or whether exploitation has been observed in the wild, but recommends organizations apply the vendor-supplied patches referenced in Moodle's own security bulletin (forum discussion 482830, published 15 October 2026).
Affected systems include all Moodle versions prior to 4.5.15, as well as the 5.0.x branch before 5.0.11, the 5.1.x branch before 5.1.8, and the 5.2.x branch before 5.2.4. Defenders operating Moodle instances, particularly in education sector environments where this platform is prevalent, should prioritize identifying their current version and upgrading to the fixed releases. No indicators of compromise or exploitation details were provided in this advisory.
Mentioned in this report
Source reporting: https://www.cert.cyber.gouv.fr/avis/CERTFR-2026-AVI-1481
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