HOMEVULNERABILITIESCVE-2026-33737
MEDIUMPOC

CVE-2026-33737

CWE-611Published: April 10, 2026· Updated: Apr 16, 2026

6.5
CVSS v3.1

Official Description

Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, multiple files use simplexml_load_string() without XXE protection. With LIBXML_NOENT flag, arbitrary server files can be read. This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3.

NVD Source

Technical Analysis

CVE-2026-33737 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.

A proof-of-concept (PoC) exploit exists for CVE-2026-33737. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

chamilo1 product
chamilo lms
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/chamilo/chamilo-lms/commit/22b1cb1c609b643765c88654155aba27070c927e
PATCHhttps://github.com/chamilo/chamilo-lms/commit/af6b7002af7c15825e98fc522e2ead0d00cacaa3
ADVISORYhttps://github.com/chamilo/chamilo-lms/security/advisories/GHSA-c4ww-qgf2-v89j

All References (3)

→
https://github.com/chamilo/chamilo-lms/commit/22b1cb1c609b643765c88654155aba27070c927ePatch
→
https://github.com/chamilo/chamilo-lms/commit/af6b7002af7c15825e98fc522e2ead0d00cacaa3Patch
→
https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-c4ww-qgf2-v89jVendor Advisory

Quick Facts

CVE IDCVE-2026-33737
CVSS Score6.5 / 10
SeverityMEDIUM
WeaknessCWE-611
CISA KEVNo
ExploitPOC
Affected1 vendor
PublishedApr 10, 2026

Related CVEs (CWE-611)

CVE-2026-49875
9.8
CVE-2026-32251
9.3
CVE-2026-13449
9.1
CVE-2026-40682
9.1
CVE-2025-14543
9.1
CVE-2026-4374
8.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-33737 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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