CVE-2025-53021: Moodle · Session Fixation Vulnerability
Affects moodleSource GCVE Database
Not known to be exploited : upgrade to 4.1.10 when convenient.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 25% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 4.1.10
Exploitation evidence
Disclosed: evidence found.
CVE published 10 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade moodle to 4.1.10.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Bitnamimoodlepkg:bitnami/moodleOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A patch is available for this vulnerability. Users should upgrade to Moodle versions 4.1.10 or later, which include the fix. Since the affected versions are no longer supported, upgrading to a supported version is strongly recommended to mitigate this risk.
Description
A session fixation vulnerability exists in Moodle versions 3.0.0 through before 4.1.10, allowing unauthenticated attackers to hijack user sessions via the sesskey parameter. The sesskey can be obtained without authentication and reused within the OAuth2 login flow, linking the victim's session to the attacker’s. Exploitation results in full account takeover. This vulnerability affects unsupported Moodle versions, as security fixes for 3.11.x ended on December 11, 2023. A patch is available for affected versions.