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.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 4.5.15, 5.0.11, 5.1.8, 5.2.4
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 4.5.15, 5.0.11, 5.1.8, 5.2.4.
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 28/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: partial
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.
Read the original 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.
cve.now Index
- Exploitation0/40No signal
- Exposure20/25No login or user action needed, CISA rates it automatable · Unknown: Advisories don't say whether default setups are affected
- Reach?/20Unknown. No tracked technology or package matched
- Severity7.5/10CVSS 7.5
- No patch0/5No signal
What would change the score
- Would score about 73 if added to CISA KEV
- Would score about 68 if CISA's SSVC rates exploitation active
- Would score about 33 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 4.5.15, 5.0.11, 5.1.8, 5.2.4.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- 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
Evidence 4
- Report
- Repository
- Link
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-123655
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: cve.now feed data
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: bugzilla.redhat.com, access.redhat.com
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: cve.now feed data
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: bugzilla.redhat.com, access.redhat.com
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: bugzilla.redhat.com, access.redhat.com