CVE-2026-33737 | Chamilo LMS up to 1.11.37/2.0.0-RC.2 simplexml_load_string xml external entity reference (GHSA-c4ww-qgf2-v89j)

VDB-356939 · CVE-2026-33737 · GHSA-C4WW-QGF2-V89J CHAMILO LMS UP TO 1.11.37/2.0.0-RC.2 SIMPLEXML_LOAD_STRING XML EXTERNAL ENTITY REFERENCE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.0 $0-$5k 1.40+ Summaryinfo A vulnerability identified as problematic has been detected in Chamilo LMS up to 1.11.37/2.0.0-RC.2. Affected by this vulnerability is the function simplexml_load_string. The manipulation leads to xml external entity reference. This vulnerability is traded as CVE-2026-33737. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component. Detailsinfo A vulnerability was found in Chamilo LMS up to 1.11.37/2.0.0-RC.2. It has been rated as problematic. This issue affects the function simplexml_load_string. The manipulation with an unknown input leads to a xml external entity reference vulnerability. Using CWE to declare the problem leads to CWE-611. The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output. Impacted is confidentiality, integrity, and availability. The summary by CVE is: 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. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-33737 since 03/23/2026. The exploitation is known to be difficult. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 1.11.38 or 2.0.0-RC.3 eliminates this vulnerability. Applying the patch 22b1cb1c609b643765c88654155aba27070c927e is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. Productinfo Type Content Management System Vendor Chamilo Name LMS Version 1.11.0 1.11.1 1.11.2 1.11.3 1.11.4 1.11.5 1.11.6 1.11.7 1.11.8 1.11.9 1.11.10 1.11.11 1.11.12 1.11.13 1.11.14 1.11.15 1.11.16 1.11.17 1.11.18 1.11.19 1.11.20 1.11.21 1.11.22 1.11.23 1.11.24 1.11.25 1.11.26 1.11.27 1.11.28 1.11.29 1.11.30 1.11.31 1.11.32 1.11.33 1.11.34 1.11.35 1.11.36 1.11.37 2.0.0-RC.0 2.0.0-RC.1 2.0.0-RC.2 License open-source CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.1 VulDB Meta Temp Score: 5.0 VulDB Base Score: 5.0 VulDB Temp Score: 4.8 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.3 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Xml external entity reference CWE: CWE-611 / CWE-610 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: LMS 1.11.38/2.0.0-RC.3 Patch: 22b1cb1c609b643765c88654155aba27070c927e Timelineinfo 03/23/2026 CVE reserved 04/10/2026 +17 days Advisory disclosed 04/10/2026 +0 days VulDB entry created 04/10/2026 +0 days VulDB entry last update Sourcesinfo Advisory: GHSA-c4ww-qgf2-v89j Status: Confirmed CVE: CVE-2026-33737 (🔒) GCVE (CVE): GCVE-0-2026-33737 GCVE (VulDB): GCVE-100-356939 Entryinfo Created: 04/10/2026 22:32 Changes: 04/10/2026 22:32 (68) Complete: 🔍 Cache ID: 99:475:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸