CVE-2026-123655 Moodle: missing access checks on h5p content files
High 7.5
Published
Updated
Check this codebase for CVE-2026-123655 and fix it if it is affected.
What it is: CVE-2026-123655 is a high-severity vulnerability, published on 6 Nov 2026.
Exploitation: There is no known exploitation of CVE-2026-123655 in the wild and no public exploit code.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-123655/ (Markdown: https://insights.sbomify.com/CVE-2026-123655/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123655?
CVE-2026-123655 is a high-severity vulnerability, published on 6 Nov 2026.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-123655?
How do I fix CVE-2026-123655?
No fix has been published for CVE-2026-123655 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123655 being exploited?
There is no known exploitation of CVE-2026-123655 in the wild and no public exploit code.
Sources
Also known as GHSA-6fjj-67pc-89w4, UBUNTU-CVE-2026-123655.