Stored XSS in class.upload.php
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-434.
Summary
As a simple library, class.upload.php does not perform an in-depth check on uploaded files, allowing a stored XSS vulnerability when the default configuration is used. Developers must be aware of that fact and use extension whitelisting accompanied by forcing the server to always provide content-type based on the file extension. The README has been updated to include these guidelines.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| class.upload.php | class.upload.php | all versions | — | No fix listed | CNA |
| — | verot/class.upload.php (Packagist) | up to 2.1.6 | — | No fix listed | GHSA-v6f4-jwv9-682w |
- class.upload.php Vendorclass.upload.php Affected all versions Fixed in — No fix listed CNA
- verot/class.upload.php (Packagist) Vendor— Affected up to 2.1.6 Fixed in — No fix listed GHSA-v6f4-jwv9-682w
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-6551
- 2026-10-03 Alias added: GHSA-v6f4-jwv9-682w
References
Sources
- CVE-2023-6551 · CVE Program
- CVE-2023-6551 · NVD
- FIRST EPSS
- GHSA-v6f4-jwv9-682w · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences