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Medium, CVSS 4.3

Moodle allows attackers to discover student e-mail addresses

CVE-2016-2151GHSA-r3fc-hx6q-g6cq

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (moodle/moodle 3.0.3, 2.9.5, 2.8.11, 2.7.13), 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
    < 2.7.13>= 2.8.0, < 2.8.11>= 2.9.0, < 2.9.5>= 3.0.0, < 3.0.3
    Fixed in
    2.9.5, 2.7.13, 3.0.3, 2.8.11

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
4.3 · CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS
  • CVE-2016-2151: 1.58% estimated exploitation activity in the next 30 days; percentile 75.52 (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.

user/index.php in Moodle through 2.6.11, 2.7.x before 2.7.13, 2.8.x before 2.8.11, 2.9.x before 2.9.5, and 3.0.x before 3.0.3 grants excessive authorization on the basis of the moodle/course:viewhiddenuserfields capability, which allows remote authenticated users to discover student e-mail addresses by leveraging the teacher role and reading a Participants list.

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

    Published from ghsa record GHSA-r3fc-hx6q-g6cq

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2016-2151

Advisory: Moodle allows attackers to discover student e-mail addresses
IDs: CVE-2016-2151, GHSA-r3fc-hx6q-g6cq
Record: https://patchnext.com/advisories/cve-2016-2151 (revision 1, source checked 26 Oct 2026, 14:15 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 3.0.3, 2.9.5, 2.8.11, 2.7.13. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist moodle/moodle: affected < 2.7.13; >= 2.8.0, < 2.8.11; >= 2.9.0, < 2.9.5; >= 3.0.0, < 3.0.3; fixed in 2.9.5, 2.7.13, 3.0.3, 2.8.11

## 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-r3fc-hx6q-g6cq (GitHub-reviewed advisory GHSA-r3fc-hx6q-g6cq lists affected ranges: Packagist moodle/moodle >=0 =2.8.0 =2.9.0 =3.0.0 <3.0.3)

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