CVE-2020-27466
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 · uneditedAn arbitrary file write vulnerability in lib/AjaxHandlers/ajaxEditTemplate.php of rConfig 3.9.6 allows attackers to execute arbitrary code via a crafted file.
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 confidenceAn arbitrary file write vulnerability in lib/AjaxHandlers/ajaxEditTemplate.php of rConfig 3.9.6 allows attackers to write arbitrary files to the filesystem, which can then be invoked to achieve arbitrary code execution on the target system.
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= 3.9.6CVSS 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
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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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Identify rConfig installation versionLocate the version file or check the login page footer for the installed rConfig version numberAffected if The installed version is exactly 3.9.6
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Verify vulnerable file existsCheck if lib/AjaxHandlers/ajaxEditTemplate.php exists in the web root directoryAffected if The file ajaxEditTemplate.php is present in the expected path
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Confirm ajax handler is web-accessibleAttempt to access the ajaxEditTemplate.php handler via HTTP/HTTPS request (e.g., GET or POST to the endpoint)Affected if The handler responds to web requests without authentication errors
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Check write permissions on template directoryInspect filesystem permissions on directories where the ajax handler can write files (typically the templates or includes directories)Affected if The web server process has write permissions to directories accessible by the ajax handler
Your environment is affected if rConfig version 3.9.6 is installed and the ajaxEditTemplate.php handler is web-accessible with write-capable permissions.
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 · scopedRestrict file write operations to authorized users only, implement strict input validation and path sanitization on file paths and names, and apply whitelisting of allowed file locations and extensions to prevent injection of malicious files.
rConfig 3.9.7 or latest stable release
- 1. Backup your current rConfig installation and database before making any changes
- 2. Download the latest stable version of rConfig from the official repository (github.com/rconfig/rconfig)
- 3. Upgrade your rConfig installation to version 3.9.7 or later (the version that patched this vulnerability)
- 4. Verify the upgrade by checking the version number in the admin interface
- 5. Test that the ajaxEditTemplate.php functionality works correctly after the upgrade
- 6. Review user access controls to ensure proper authorization is enforced
- 7. Monitor logs for any suspicious activity related to template editing functionality
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-2020-27466 — 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-2020-27466 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
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