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An improper sanitization vulnerability exists in Chamilo LMS (<= v1.11.20) in the file main/inc/lib/fileUpload.lib.php on Windows and Apache installations. The flaw allows attackers to bypass file upload security mechanisms and upload a .htaccess file, which can be used to achieve remote code execution. The vulnerability can be exploited by privileged attackers directly, or by unauthenticated attackers if chained with other vulnerabilities such as CVE-2023-3533 (arbitrary file write).
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
.htaccess files and configure the web server to ignore .htaccess files in upload directories. Additionally, apply least privilege principles to file upload directories and monitor for suspicious file uploads.Patch, then assume compromise.
.htaccess files cannot be uploaded or interpreted in upload directories.No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
1 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.