CVE-2020-26048
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 · uneditedThe file manager option in CuppaCMS before 2019-11-12 allows an authenticated attacker to upload a malicious file within an image extension and through a custom request using the rename function provided by the file manager is able to modify the image extension into PHP resulting in remote arbitrary code execution.
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 confidenceCuppaCMS before the 2019-11-12 release contains a file manager vulnerability allowing authenticated users to upload files with image extensions, then use the rename function to change the extension to .php, achieving remote code execution. The flaw bypasses extension validation by leveraging the rename feature after upload.
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< 2019-11-12CVSS 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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Locate CuppaCMS installation and identify versionSearch for CuppaCMS core files (typically in the web root). Look for a version identifier in files such as version.php, config.php, or the main index.php that displays or stores the CMS version. Check file modification dates as the specific release date (2019-11-12) may be encoded in the version string.Affected if The installed version is earlier than the 2019-11-12 release, or the version cannot be determined but the files appear older than November 2019.
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Verify file manager component is present and enabledCheck for the existence of the file manager module in the CuppaCMS directory structure (commonly in components or modules folders). Look for files related to file upload/management functionality.Affected if The file manager component exists and appears to be installed on the system.
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Confirm user authentication is enabledCheck if the CuppaCMS user authentication system is active. Look for user login functionality, user registration, or admin access controls in the configuration.Affected if User authentication is enabled, allowing registered users to access the CMS backend.
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Check if rename functionality exists in file managerInspect the file manager code for a rename operation. Look for rename, move, or similar functions that accept user-supplied file names and extensions.Affected if The file manager includes a rename or move feature that allows changing file extensions.
A user is affected if the installed CuppaCMS version predates 2019-11-12 AND the file manager with rename capability is accessible to authenticated users on the system.
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 data2019-11-12
Update CuppaCMS to a version after 2019-11-12. If immediate update is not feasible, disable or restrict the file manager's rename functionality and implement strict server-side validation that verifies file content rather than just extension.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2020-26048 — 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-2020-26048 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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