What is the CVSS score of CVE-2025-67853?

CVE-2025-67853 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Moodle are affected by CVE-2025-67853?

CVE-2025-67853 affects Moodle's email confirmation service, allowing remote attackers to bypass rate limiting and potentially launch denial-of-service or account enumeration attacks.. A patch is available.

How to fix or mitigate CVE-2025-67853?

Within 24 hours: Inventory all Moodle instances and verify patch status; enable monitoring for excessive email confirmation requests. Within 7 days: Implement compensating controls (WAF rules, IP rate limiting); communicate incident status to stakeholders. Within 30 days: Prioritize Moodle upgrade to patched version when vendor releases; conduct post-incident review of email service security.

Moodle CVE-2025-67853

HIGH

Improper Restriction of Excessive Authentication Attempts (CWE-307)

2026-02-03 patrick@puiterwijk.org

GHSA-5cx4-w4fh-fr57

Moodle

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Feb 03, 2026 - 11:15 nvd

HIGH 7.5

DescriptionCVE.org

A flaw was found in Moodle. A remote attacker could exploit a lack of proper rate limiting in the confirmation email service. This vulnerability allows attackers to more easily enumerate or guess user credentials, facilitating brute-force attacks against user accounts.

AnalysisAI

A flaw was found in Moodle. A remote attacker could exploit a lack of proper rate limiting in the confirmation email service. [CVSS 7.5 HIGH]

Technical ContextAI

Classified as CWE-307 (Improper Restriction of Excessive Authentication Attempts). Affects the confirmation email component of Moodle. A flaw was found in Moodle. A remote attacker could exploit a lack of proper rate limiting in the confirmation email service. This vulnerability allows attackers to more easily enumerate or guess user credentials, facilitating brute-force attacks against user accounts.

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

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CVE-2025-67853 vulnerability details – vuln.today

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Moodle CVE-2025-67853

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

Technical ContextAI

RemediationAI

More in Moodle

Same weakness CWE-307 – Improper Restriction of Excessive Authentication Attempts

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External POC / Exploit Code