CVE-2026-74932: CWE-79 Cross-Site Scripting (XSS) in WP Fastest Cache
Description
WP Fastest Cache versions 0.9.0.3 and earlier contain a cross-site scripting (XSS) vulnerability due to improper validation of the Host header. This flaw allows unauthenticated attackers to poison cached pages with malicious JavaScript, which executes for every visitor. The vulnerability arises because the plugin does not validate the Host header before using it to build asset URLs and does not include the header in the cache key.
CVSS v3.1
Score 7.5high
Affected software
WP Fastest Cache
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The WP Fastest Cache WordPress plugin before version 1.5.1 fails to validate the Host header when constructing URLs for embedded asset files in cached pages. Additionally, the Host header is not included in the cache key, enabling unauthenticated attackers to inject references to a malicious server. This results in arbitrary JavaScript execution for all subsequent visitors to the poisoned cached pages. The vulnerability is categorized as CWE-79 (Cross-Site Scripting).
Potential Impact
Successful exploitation allows an unauthenticated attacker to perform cross-site scripting attacks by poisoning cached pages with malicious JavaScript. This can lead to full compromise of confidentiality, integrity, and availability for users visiting the affected site, including theft of sensitive information and potential site defacement or disruption.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider disabling caching or restricting access to the affected plugin functionality to trusted users only. Monitor vendor channels for updates regarding patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-08-17T11:37:30.321Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8df9edacd9273b49ac741d
Added to database: 08/25/2026, 20:24:13 UTC
Last enriched: 09/09/2026, 21:22:10 UTC
Last updated: 10/09/2026, 06:48:19 UTC
Views: 60
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