PhastPress Unauthenticated Server-Side Request Forgery via Host Header
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
PhastPress, a WordPress plugin by kiboit, is vulnerable to Server-Side Request Forgery in all versions up to and including 3.10. The scripts service endpoint builds its URL whitelist from the HTTP Host header, which unauthenticated attackers control. By spoofing the header to match a target URL, an attacker bypasses the whitelist and makes the server request arbitrary internal or external destinations and return the response content. CVSS 3.1 base score 7.3 (HIGH); weakness CWE-918.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
The PhastPress plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 3.10 This is due to the scripts service endpoint constructing its URL whitelist dynamically from the attacker-controlled HTTP 'Host' header. This makes it possible for unauthenticated attackers to spoof the header to match any target URL, bypassing the whitelist and forcing the server to make HTTP requests to arbitrary internal or external destinations and return the response content.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version is listed for PhastPress. Remove or disable the plugin until a patched release is available, and restrict outbound requests from the web server to internal networks where possible.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Timeline
- 2026-10-15 Threatist record created from CVE-2026-3712
- 2026-10-16 Alias added: GHSA-gj56-mwgx-mqvf
- 2026-10-16 CISA SSVC decision points changed
- 2026-10-16 Priority changed: MEDIUM → LOW
References
Other 3
- https://www.wordfence.com/threat-intel/vulnerabilities/id/1c3fbca2-f11f-4f9c-9d70-eea98bdfd3b0?source=cve
- https://plugins.trac.wordpress.org/changeset?reponame=&new=3627042%40phastpress%2Ftags%2F3.11&old=3578731%40phastpress%2Ftags%2F3.10
- https://plugins.trac.wordpress.org/changeset/3627041/phastpress/trunk/sdk/phast.php
More kiboit vulnerabilities
- TI-2025-13142 PhastPress <= 3.7 - Unauthenticated Arbitrary File Read via Null Byte Injection CVSS 3.1CRITICAL 9.8
- TI-2021-06502 PhastPress < 1.111 - Open Redirect CVSS 3.1MEDIUM 6.1
Sources
- CVE-2026-3712 · CVE Program
- CVE-2026-3712 · NVD
- FIRST EPSS
- GHSA-gj56-mwgx-mqvf · 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