W (wcms) through 3.18.0 RCE and Arbitrary File Write via Media Upload API
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- 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-434.
Summary
W (vincent-peugnet/wcms) through 3.18.0 contains a remote code execution vulnerability that allows authenticated editors to write arbitrary files by abusing the unvalidated path in POST /api/v0/media/upload/[*:path]. Attackers can upload .php files executed by the web server, use encoded ../ sequences to write outside the media directory, and delete arbitrary files via DELETE /api/v0/media/[*:path].
Why it matters now
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 |
|---|---|---|---|---|---|
| vincent-peugnet | wcms | up to 3.18.0 | — | No fix listed | CNA |
- wcms Vendorvincent-peugnet Affected up to 3.18.0 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-04 Threatist record created from CVE-2026-105123
- 2026-10-04 Alias added: GHSA-r3hg-hgx7-58g9
- 2026-10-04 Priority changed: MEDIUM → LOW
- 2026-10-05 CISA SSVC decision points changed
- 2026-10-05 Priority changed: LOW → MEDIUM
References
More vincent-peugnet vulnerabilities
- TI-2026-67499 W (wcms) through 3.18.0 Unauthenticated Stored XSS via Login Username and Comments CVSS 4.0MEDIUM 5.3
Sources
- CVE-2026-105123 · CVE Program
- CVE-2026-105123 · NVD
- FIRST EPSS
- GHSA-r3hg-hgx7-58g9 · GitHub Advisory Database · CC BY 4.0
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