EUVD-2026-52598
GHSA-qc2w-xhvw-6xmh
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
AC:H reflects the non-default Cyrlitera configuration prerequisite, a condition beyond the attacker's control; all other metrics align with the vendor vector.
Primary rating from Vendor (WPScan).
CVSS VectorVendor: WPScan
Lifecycle Timeline
4DescriptionCVE.org
The Clearfy Cache WordPress plugin before 2.4.3 does not validate the redirect target in its Cyrlitera old-URL redirect handler, passing a decoded request URI to an unsafe redirect function, which allows unauthenticated attackers to redirect visitors to an arbitrary external URL when a non-default option is enabled.
AnalysisAI
Open redirect in Clearfy Cache WordPress plugin (versions before 2.4.3) allows unauthenticated attackers to redirect site visitors to arbitrary external URLs by exploiting the Cyrlitera old-URL redirect handler, which passes a decoded request URI to an unsafe redirect function without target validation. Exploitation requires that the non-default Cyrlitera redirect option is enabled on the target site, and a victim must interact with an attacker-crafted URL. No public KEV listing exists, EPSS sits at the 4th percentile (0.14%), but a publicly available proof-of-concept has been published by WPScan.
Technical ContextAI
Clearfy Cache is a WordPress cache and SEO optimization plugin that includes a Cyrlitera feature for handling legacy Cyrillic-script URLs through HTTP redirects. The root cause (CWE-601: URL Redirection to Untrusted Site) arises because the plugin decodes the incoming request URI and forwards it directly to a PHP redirect function without enforcing that the destination belongs to an allowlisted or relative path. This bypass means an attacker can inject an absolute external URL as the redirect target. The CPE identifier cpe:2.3:a:unknown:clearfy_cache:*:*:*:*:*:*:*:* reflects that NVD has not yet confirmed the vendor field; the affected range is all versions below 2.4.3 per WPScan and EUVD-2026-52598.
RemediationAI
Update the Clearfy Cache plugin to version 2.4.3 or later, which introduces redirect target validation in the Cyrlitera handler; this is the primary and preferred fix. The WPScan advisory at https://wpscan.com/vulnerability/265f2edb-1c86-4b87-a59f-d5de5bf21494/ confirms version 2.4.3 as the patched release. If immediate upgrade is not feasible, disable the Cyrlitera old-URL redirect option within the plugin settings - this removes the vulnerable code path entirely with no reported functional side effects beyond loss of the Cyrillic legacy-URL redirect feature. Sites that never enabled this non-default option are not exposed and require no compensating control beyond scheduling the upgrade. WordPress site owners should also audit outbound redirect behavior via web application firewall rules (e.g., block or alert on external Location header values) as a defense-in-depth measure.
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External POC / Exploit Code
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