CVE-2023-31807
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 · uneditedCross Site Scripting vulnerability found in Chamilo Lms v.1.11.18 allows a local attacker to execute arbitrary code via a crafted payload to the personal notes function.
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 · moderate confidenceCross-Site Scripting (XSS) vulnerability in Chamilo LMS v1.11.18 within the personal notes function allows a local attacker to inject malicious scripts through crafted payloads. The stored XSS executes when other users view the compromised notes, potentially leading to session hijacking or arbitrary code execution in user browsers.
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= 1.11.18CVSS 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
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
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 versionLocate the version file or admin panel in your Chamilo installation. Common paths: /chamilo/include/library/configuration/platform.config.php or through Admin > Configuration > Platform > Version. Alternatively, check the changelog file or composer.json for version 1.11.18.Affected if The installed version is exactly 1.11.18
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Verify personal notes module is enabledNavigate to Admin > Plugins or check the plugins configuration to confirm the personal notes functionality is active. Also verify the main menu contains a 'Notes' or 'Personal notes' entry.Affected if The personal notes module is enabled and visible to users
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Confirm note creation capability existsAs a logged-in user, navigate to the personal notes section and verify you can create a new note. Check if there is a form or interface for adding notes with title and content fields.Affected if Users can create and save personal notes through the web interface
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Verify notes are viewable by other usersCreate a note with one user account, then log in as a different user and check if you can view that note. The vulnerability triggers when other users access/view the compromised note.Affected if Notes can be accessed or viewed by users other than the note creator
You are affected if your Chamilo LMS is version 1.11.18 AND the personal notes function is enabled, allowing users to create notes that can be viewed by other users.
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.
From vendor dataImplement robust input validation and output encoding (contextual escaping) on all user-supplied content in the personal notes function. Consider deploying Content Security Policy (CSP) headers as an additional defense-in-depth measure.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2023-31807 — 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-2023-31807 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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