EUVD-2026-66292
GHSA-c7h6-xfw7-v3wq
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Stored XSS executes automatically on page load (UI:N from attacker perspective); Contributor role required (PR:L); cross-context browser impact justifies S:C; partial C and I only, no availability impact.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
The Gutenverse - Ultimate WordPress FSE Blocks Addons & Ecosystem plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the multiple blocks in all versions up to, and including, 4.0.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
AnalysisAI
Stored Cross-Site Scripting in the Gutenverse FSE blocks plugin for WordPress (all versions through 4.0.2) enables authenticated attackers holding Contributor-level accounts or higher to embed persistent malicious JavaScript into page content via multiple vulnerable block types. Because the injected payload executes automatically in any visitor's browser session, the attack surface extends beyond the contributing user to all site visitors and administrators who load the affected pages. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated WordPress user account with at minimum Contributor-level role on the target site - this is confirmed by the CVSS vector PR:L (low privileges). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.4 (Medium) reflects a realistic but bounded threat: network-accessible (AV:N), low complexity (AC:L), low-privilege requirement (PR:L - Contributor role), and scope change (S:C), but with only partial confidentiality and integrity impact (C:L/I:L) and no availability impact. … 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 | Site operators should update the Gutenverse plugin to the version delivered by WordPress plugin repository changeset 3662715 (https://plugins.trac.wordpress.org/changeset/3662715/), which contains the sanitization fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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