CVE-2025-67856
Published: 03 February 2026
Summary
CVE-2025-67856 is a medium-severity Incorrect Authorization (CWE-863) vulnerability in Moodle Moodle. Its CVSS base score is 5.4 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 18.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-24 (Access Control Decisions) and AC-3 (Access Enforcement).
Deeper analysis
CVE-2025-67856 is an authorization logic flaw in Moodle, stemming from incomplete role checks during the badge awarding process. This vulnerability allows badges to be granted without proper verification, enabling unauthorized users to obtain badges they are not entitled to. Published on 2026-02-03, it is associated with CWE-863 (Incorrect Authorization) and carries a CVSS v3.1 base score of 5.4 (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N), rated as Medium severity.
The vulnerability can be exploited by a low-privileged authenticated user over the network with low attack complexity and no user interaction required. Attackers can manipulate the badge awarding mechanism to self-award or award badges improperly, potentially resulting in privilege escalation or unauthorized access to Moodle features gated by those badges.
Red Hat has issued an advisory detailing the issue at https://access.redhat.com/security/cve/CVE-2025-67856, with additional tracking in Bugzilla at https://bugzilla.redhat.com/show_bug.cgi?id=2423864. Security practitioners should consult these resources for patch availability and mitigation guidance specific to affected Moodle deployments.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-206750
Vulnerability details
A flaw was found in Moodle. An authorization logic flaw, specifically due to incomplete role checks during the badge awarding process, allowed badges to be granted without proper verification. This could enable unauthorized users to obtain badges they are not…
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entitled to, potentially leading to privilege escalation or unauthorized access to certain features.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Authorization bypass in badge awarding directly enables unauthorized privilege escalation to access gated features.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly enforces authorization decisions so incomplete role checks cannot grant badges without verified privileges.
Requires correct access-control decisions based on verified role attributes during the badge-awarding workflow.
Limits privileges so even authenticated users cannot reach or misuse the badge-awarding function beyond their assigned roles.