EUVD-2026-65961
GHSA-862p-vrqf-hqpw
Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
S:C replaces S:U because poisoned cache entries propagate attacker JS to all subsequent visitors; A:N because the vulnerability does not meaningfully disrupt availability.
Primary rating from Vendor (wpscan).
CVSS VectorVendor: wpscan
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
The WP Fastest Cache WordPress plugin before 1.5.1 does not validate the Host header before using it to build the URLs of the asset files it embeds in the pages it caches, and does not include that header in the cache key, allowing unauthenticated attackers to poison cached pages with references to a server they control and have arbitrary JavaScript run for every subsequent visitor.
AnalysisAI
Cache poisoning via Host header injection in WP Fastest Cache before version 1.5.1 exposes every WordPress site visitor to unauthenticated JavaScript execution from attacker-controlled servers. The plugin incorporates the client-supplied HTTP Host header into asset file URLs baked into cached pages while omitting that header from the cache key, meaning a single forged request can persist malicious script references across all subsequent page serves. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target WordPress site must have WP Fastest Cache plugin version prior to 1.5.1 installed and active, with page caching enabled - the attack is ineffective if caching is disabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.5 (AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H) accurately captures the unauthenticated, network-accessible nature of the attack, but the S:U (Unchanged scope) designation is arguably conservative - cache poisoning inherently spreads impact to subsequent visitors beyond the directly targeted system, which aligns more closely with S:C semantics and is reflected in the assessed vector below. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker identifies a WordPress site with WP Fastest Cache installed and determines that a high-traffic page is not yet cached. They send an HTTP GET request for that page with the Host header set to their own domain (e.g., evil.com) and serve malicious JavaScript at the expected asset path on that domain. … |
| Remediation | The primary fix is to update WP Fastest Cache to version 1.5.1 or later, which introduces Host header validation and incorporates the Host header into cache key computation, as documented in the WPScan advisory at https://wpscan.com/vulnerability/f1eebb4a-cfd1-419e-852d-e5a949437afb/. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all WordPress installations to identify those running WP Fastest Cache versions prior to 1.5.1 and notify affected site operators of the active vulnerability. …
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External POC / Exploit Code
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