CVE-2026-29041
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedChamilo is a learning management system. Prior to version 1.11.34, Chamilo LMS is affected by an authenticated remote code execution vulnerability caused by improper validation of uploaded files. The application relies solely on MIME-type verification when handling file uploads and does not adequately validate file extensions or enforce safe server-side storage restrictions. As a result, an authenticated low-privileged user can upload a crafted file containing executable code and subsequently execute arbitrary commands on the server. This issue has been patched in version 1.11.34.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceChamilo LMS versions prior to 1.11.34 contain an authenticated RCE vulnerability where the application relies solely on MIME-type verification for uploaded files without validating file extensions or enforcing safe server-side storage. Low-privileged authenticated users can upload crafted executable files and achieve arbitrary command execution.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 1.11.34CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Chamilo LMS versionAccess the admin panel and navigate to Administration > Configuration > Platform or check the version.php file in the installation directory. Alternatively, view the footer of any Chamilo page for the version number.Affected if The installed version is less than 1.11.34.
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Verify file upload feature is accessible to low-privileged usersLog in with a low-privilege user account (e.g., student or teacher role) and navigate to a course or document upload section. Attempt to access the file upload functionality.Affected if Low-privileged authenticated users can access and use the file upload feature.
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Inspect uploaded files storage locationCheck the configuration file (typically config.php or settings.php) for the upload directory path. Verify if the upload directory is located inside the webroot (public_html, www, or htdocs) or outside of it.Affected if Uploaded files are stored within the web-accessible directory tree.
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Test for missing file extension validationAttempt to upload a file with a double extension (e.g., file.php.jpg) or an executable extension (.php, .phtml, .exe) through the upload feature. Observe whether the upload is accepted.Affected if The application accepts files with potentially dangerous extensions without blocking them.
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Check if MIME-type is the only validationReview the upload handling code in main/inc/lib/fileUpload.lib.php or similar upload handler files. Look for whether only $_FILES content-type is checked without extension validation.Affected if The code performs MIME-type checks only and lacks extension-based validation logic.
You are affected if your Chamilo LMS version is below 1.11.34 AND low-privileged users can upload files that are stored in a web-accessible location without proper extension validation.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped1.11.34
Upgrade to Chamilo LMS version 1.11.34 or later. Implement comprehensive file upload validation including file extension whitelisting, filename sanitization, and storage outside the webroot to prevent direct script execution.
1.11.34
- Create a complete backup of the Chamilo database and all files, including configuration
- Download Chamilo LMS version 1.11.34 from the official source (github.com/chamilo/chamilo-lms)
- Place the site in maintenance mode or ensure no users are accessing during upgrade
- Upload and extract the version 1.11.34 files to replace the existing installation
- Run any database migration scripts included in the new version
- Clear any cached files and temporary directories
- Verify the installation by logging in as an administrator
- Test file upload functionality to confirm the vulnerability is patched
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-29041 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-29041 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data