EUVD-2026-82755
GHSA-vvvj-jr6q-4x2q
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Contributor account required (PR:L), no interaction to inject (UI:N), stored payload executes in other users' browsers crossing a security boundary (S:C) with limited confidentiality/integrity impact and no availability effect.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
3DescriptionCVE.org
The Kubio AI Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via kubio/copyright Block Content in all versions up to, and including, 2.8.4 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. This bypasses both the WordPress core kses-on-save filter and the plugin's own wp_kses_post() call, because entity-encoded script tags are treated as inert text by kses but are decoded into live HTML by the subsequent html_entity_decode() call in CopyrightBlock::render_template().
AnalysisAI
Stored cross-site scripting in the Kubio AI Page Builder plugin for WordPress (all versions up to and including 2.8.4) lets authenticated users with contributor-level access or higher embed HTML-entity-encoded script markup inside the kubio/copyright block, which the plugin subsequently decodes back into live HTML and renders to anyone who views the page. Because the payload survives both the WordPress core kses-on-save filter and the plugin's own wp_kses_post() call, the injected script executes in the browser of an admin, editor, or visitor who loads the affected content; the attacker needs no further interaction after saving the post. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated account with contributor-level access or higher on the target WordPress site (PR:L), and the site must use the Kubio AI Page Builder plugin at version 2.8.4 or below with the kubio/copyright block available. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a moderate-severity, credibly-real stored XSS with a specific, well-understood root cause rather than an inflated high-CVSS finding. … 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 primary fix is to update Kubio AI Page Builder beyond the 2.8.4 release line as soon as a patched version is published; the upstream correction appears as plugin Trac changeset 3616537 (https://plugins.trac.wordpress.org/changeset?reponame=&old=3616537%40kubio&new=3616537%40kubio), so treat the fix as upstream fix available (commit/changeset) with the released patched version not independently confirmed here, and verify the changelog on the plugin's WordPress.org page before assuming a given release number contains it. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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