TextPattern CMS 4.9.0-dev Authenticated Remote Code Execution via Plugin Upload
Priority LOW 39CWE-352Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Tampering
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-352.
Summary
TextPattern CMS 4.9.0-dev contains a remote code execution vulnerability that allows authenticated attackers to upload arbitrary PHP files by exploiting the plugin upload functionality. Attackers can authenticate, retrieve a CSRF token from the plugin event page, and upload malicious PHP files to the textpattern/tmp/ directory for code execution.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00315 24th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
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 |
|---|---|---|---|---|---|
| Textpattern | TextPattern CMS | 4.9.0-dev | — | No fix listed | CNA |
- TextPattern CMS VendorTextpattern Affected 4.9.0-dev Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-47976
- 2026-10-03 Alias added: GHSA-77f2-mm55-xvp4
References
Exploit 1
More Textpattern vulnerabilities
- TI-2023-09955 An arbitrary file upload vulnerability in the plugin upload function of Textpattern… CVSS 3.1HIGH 8.8
- TI-2021-22556 TextPattern CMS 4.8.7 Remote Code Execution via File Upload CVSS 4.0HIGH 8.7
- TI-2023-18162 Directory Traversal vulnerability in Textpattern CMS v4.8.8 allows a remote authenticated… CVSS 3.1HIGH 7.2
- TI-2023-11802 An arbitrary file upload vulnerability in the upload plugin of Textpattern v4.8.8 and… CVSS 3.1HIGH 7.2
- TI-2026-25434 Textpattern CMS 4.9.0: Second-Order XSS via Atom Feed Injection CVSS 4.0MEDIUM 5.1
- TI-2018-05387 An issue was discovered in Textpattern CMS 4.6.2 and earlier. CVSS 3.0CRITICAL 9.8
Sources
- CVE-2021-47976 · CVE Program
- CVE-2021-47976 · NVD
- FIRST EPSS
- GHSA-77f2-mm55-xvp4 · 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