EUVD-2026-75937
GHSA-342h-68mm-3pfr
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
AC:H reflects non-default 'Debugging mode' prerequisite beyond attacker control; all other metrics match standard reflected XSS with scope change.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
The Relevanssi - A Better Search plugin for WordPress is vulnerable to Reflected Cross-Site Scripting in versions up to, and including, 4.28.1 via the 's', 'post_types', and 'orderby' request parameters. This is due to insufficient input sanitization and output escaping in the relevanssi_debug_array() function in lib/debug.php, which dumps user-supplied query variables through print_r() inside a <pre> block without HTML escaping. The debug path is enabled by supplying the relevanssi_debug=on request parameter when the administrator has previously enabled the 'Debugging mode' setting; the gate itself is a configuration check with no capability, nonce, or logged-in check (the vendor explicitly suppresses nonce verification on that line). This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a specially crafted link.
AnalysisAI
Reflected XSS in Relevanssi - A Better Search (≤4.28.1) allows unauthenticated remote attackers to inject arbitrary JavaScript into WordPress search pages when a site administrator has enabled the plugin's 'Debugging mode' setting. The vulnerability exists in relevanssi_debug_array() (lib/debug.php), which passes raw user-supplied query parameters s, post_types, and orderby through PHP's print_r() into an unescaped <pre> HTML block. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a WordPress site administrator has previously navigated to the Relevanssi settings panel and enabled the 'Debugging mode' option, which is off by default. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The published CVSS 6.1 vector (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) reflects a standard reflected-XSS baseline, but AC:L overstates the ease of exploitation: the attack is gated behind a non-default administrator setting ('Debugging mode'), which is off by default and typically used only during site troubleshooting. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The upstream fix is captured in WordPress Plugin Trac changeset moving from revision 3529670 to 3650355 on the relevanssi trunk; site operators should upgrade to the first tagged release following 4.28.1 once published - the exact fix-version number is not independently confirmed in the available data, so monitor the Wordfence advisory at https://www.wordfence.com/threat-intel/vulnerabilities/id/d07fe28c-f76e-42b2-b894-be316004235a for the confirmed patched version. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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