Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-5cx4-w4fh-fr57
Advisory ID github_osv/GHSA-5cx4-w4fh-fr57
Aliases CVE-2025-67853
Summary Moodle Affected by Improper Restriction of Excessive Authentication Attempts 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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-307 Improper Restriction of Excessive Authentication Attempts
System Score Found at
cvssv3.1 7.5 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-5cx4-w4fh-fr57/GHSA-5cx4-w4fh-fr57.json
generic_textual HIGH
Reference id Reference type URL
https://github.com/moodle/moodle
https://moodle.org/mod/forum/discuss.php?d=471303
CVE-2025-67853 Advisory https://access.redhat.com/security/cve/CVE-2025-67853
CVE-2025-67853 https://nvd.nist.gov/vuln/detail/CVE-2025-67853
show_bug.cgi?id=2423847 Bug https://bugzilla.redhat.com/show_bug.cgi?id=2423847
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-5cx4-w4fh-fr57/GHSA-5cx4-w4fh-fr57.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-02-03T15:43:42Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2025/67xxx/CVE-2025-67853.json

Source Advisory: vulnrichment/CVE-2025-67853

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'yes'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]