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Medium, CVSS 4.3

Moodle has an IDOR in messaging web service which allows access to some user details

CVE-2025-3645GHSA-pj96-xh2w-fgqx

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (moodle/moodle 4.5.4, 4.4.8, 4.3.12, 4.1.18), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Packagist moodle/moodle

    Affected
    < 4.1.18>= 4.3.0-beta, < 4.3.12>= 4.4.0-beta, < 4.4.8>= 4.5.0-beta, < 4.5.4
    Fixed in
    4.4.8, 4.1.18, 4.5.4, 4.3.12

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS
  • CVE-2025-3645: 0.37% estimated exploitation activity in the next 30 days; percentile 30.46 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

A flaw was found in Moodle. Insufficient capability checks in a messaging web service allowed users to view other users' names and online statuses.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-pj96-xh2w-fgqx

Agent brief

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# Patch Next advisory brief: CVE-2025-3645

Advisory: Moodle has an IDOR in messaging web service which allows access to some user details
IDs: CVE-2025-3645, GHSA-pj96-xh2w-fgqx
Record: https://patchnext.com/advisories/cve-2025-3645 (revision 1, source checked 26 Oct 2026, 14:33 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: moodle/moodle 4.5.4, 4.4.8, 4.3.12, 4.1.18. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist moodle/moodle: affected < 4.1.18; >= 4.3.0-beta, < 4.3.12; >= 4.4.0-beta, < 4.4.8; >= 4.5.0-beta, < 4.5.4; fixed in 4.4.8, 4.1.18, 4.5.4, 4.3.12

## Suggested inspection (read-only)
- Packagist moodle/moodle: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on moodle/moodle.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-pj96-xh2w-fgqx (GitHub-reviewed advisory GHSA-pj96-xh2w-fgqx lists affected ranges: Packagist moodle/moodle >=0 =4.3.0-beta =4.4.0-beta =4.5.0-beta <4.5.4)

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