Moodle has a Remote Code Execution risk via file restore
Impact
A flaw was identified in Moodle’s backup restore functionality where specially crafted backup files were not properly validated during processing. If a malicious backup file is restored, it could lead to unintended execution of server-side code. Since restore capabilities are typically available to privileged users, exploitation requires authenticated access. Successful exploitation could result in full compromise of the Moodle server.
Source excerpt · OSVSince restore capabilities are typically available to privileged users, exploitation requires authenticated access.
Affected packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
| Affected range | Recorded fix |
|---|---|
| From 5.1.0-beta before 5.1.2Ecosystem versions | 5.1.2 |
| From 5.0.0-beta before 5.0.5Ecosystem versions | 5.0.5 |
| Earlier releases before 4.5.9Ecosystem versions | 4.5.9 |
Version evidence: OSV · GHSA-ggxq-2mg9-8966
View original version evidence (428 explicit versions)
Original source description
A flaw was identified in Moodle’s backup restore functionality where specially crafted backup files were not properly validated during processing. If a malicious backup file is restored, it could lead to unintended execution of server-side code. Since restore capabilities are typically available to privileged users, exploitation requires authenticated access. Successful exploitation could result in full compromise of the Moodle server.
References
- Security advisory nvd.nist.gov/vuln/detail/CVE-2026-26045
- Patch github.com/moodle/moodle/commit/566054ba11f609a6d48d09b32e85d435d49927da
- Security advisory access.redhat.com/security/cve/CVE-2026-26045
- Source reference bugzilla.redhat.com/show_bug.cgi
- Source reference github.com/moodle/moodle
- Source reference moodle.org/mod/forum/discuss.php