CVE-2026-33704 | Chamilo LMS up to 1.11.37 BigUpload Endpoint unrestricted upload (GHSA-phfx-pwwg-945v)

VDB-356920 · CVE-2026-33704 · GHSA-PHFX-PWWG-945V CHAMILO LMS UP TO 1.11.37 BIGUPLOAD ENDPOINT UNRESTRICTED UPLOAD HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.5 $0-$5k 0.84+ Summaryinfo A vulnerability was found in Chamilo LMS up to 1.11.37 and classified as critical. This vulnerability affects unknown code of the component BigUpload Endpoint. Executing a manipulation can lead to unrestricted upload. This vulnerability is registered as CVE-2026-33704. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component. Detailsinfo A vulnerability was found in Chamilo LMS up to 1.11.37. It has been declared as critical. This vulnerability affects an unknown code of the component BigUpload Endpoint. The manipulation with an unknown input leads to a unrestricted upload vulnerability. The CWE definition for the vulnerability is CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes: Chamilo LMS is a learning management system. Prior to 1.11.38, any authenticated user (including students) can write arbitrary content to files on the server via the BigUpload endpoint. The key parameter controls the filename and the raw POST body becomes the file content. While .php extensions are filtered to .phps, the .pht extension passes through unmodified. On Apache configurations where .pht is handled as PHP, this leads to Remote Code Execution. This vulnerability is fixed in 1.11.38. The advisory is shared for download at github.com. This vulnerability was named CVE-2026-33704 since 03/23/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1608.002. Upgrading to version 1.11.38 eliminates this vulnerability. Applying the patch 9748f1ffbdb8b6dc84c0e0591c9d3c1d92e21c00 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 License open-source CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.7 VulDB Meta Temp Score: 6.5 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.1 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: Unrestricted upload CWE: CWE-434 / CWE-284 / CWE-266 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 Patch: 9748f1ffbdb8b6dc84c0e0591c9d3c1d92e21c00 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-phfx-pwwg-945v Status: Confirmed CVE: CVE-2026-33704 (🔒) GCVE (CVE): GCVE-0-2026-33704 GCVE (VulDB): GCVE-100-356920 Entryinfo Created: 04/10/2026 22:26 Changes: 04/10/2026 22:26 (68) Complete: 🔍 Cache ID: 99:5E3:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸