EUVD-2026-53186
GHSA-6qv8-88q7-vr84
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Stored XSS requires victim to visit the injected page (UI:R not UI:N); Contributor auth required (PR:L); scope changes to victim browser session (S:C).
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
The SKT Skill Bar plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the chart_size attribute of the skillwrapper shortcode in all versions up to, and including, 2.6. This is due to insufficient input sanitization and output escaping on the chart_size attribute, which is concatenated directly into an inline <style> block. 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 XSS in SKT Skill Bar WordPress plugin (all versions up to and including 2.6) permits authenticated Contributor-level attackers to persist arbitrary JavaScript into any post or page by exploiting unsanitized handling of the chart_size attribute in the skillwrapper shortcode. The attribute value is concatenated directly into an inline <style> block without sanitization or output escaping, enabling CSS-context breakout and script injection that executes against every subsequent visitor. No public exploit code or CISA KEV listing was identified at time of analysis, though the vulnerable code is publicly browsable in the WordPress plugin repository, lowering the barrier to exploit development.
Technical ContextAI
SKT Skill Bar (CPE: cpe:2.3:a:sonalsinha21:skt_skill_bar) is a WordPress plugin by sonalsinha21 that renders animated skill/progress bar UI elements via the [skillwrapper] shortcode. The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation): the chart_size shortcode attribute is concatenated verbatim into an inline <style> block in the rendered HTML (visible in sktskillbar.php at lines 56, 240, and 541 of the 2.6 tag). No sanitization functions such as sanitize_text_field or output escaping functions such as esc_attr are applied before embedding into the DOM. Because the injection lands inside a CSS context rather than an HTML attribute or text node, attackers can use CSS escape sequences or closing style tags to break into a JavaScript execution context. The CVSS S:C (Scope Changed) metric correctly reflects that the resulting script executes in the victim's browser session, transcending the plugin's own security boundary.
RemediationAI
An upstream fix appears to have been committed to the plugin trunk as changeset 3565730, viewable at https://plugins.trac.wordpress.org/changeset?reponame=&new=3565730%40skt-skill-bar%2Ftrunk&old=3565726%40skt-skill-bar%2Ftrunk; however, a released patched version number is not independently confirmed from available data - administrators should check the WordPress plugin repository for a release beyond version 2.6 and update immediately if available. As a compensating control pending patch availability, revoke or restrict Contributor-level access on any site where open user registration is enabled, since this eliminates the authenticated attack vector at the cost of reduced editorial capacity. Disabling the SKT Skill Bar plugin entirely eliminates the attack surface with the trade-off of losing skill bar rendering on existing pages. A web application firewall such as Wordfence can provide partial mitigation by detecting and blocking common XSS payload patterns at the request layer, though this is not a substitute for patching.
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External POC / Exploit Code
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