SKT Skill Bar chart_size shortcode attribute permits stored XSS

SKT Skill Bar through 2.6 lets a Contributor store an attacker-controlled chart_size attribute in the skillwrapper shortcode. The plugin concatenates that value directly into an inline style block without sufficient sanitization or escaping, allowing stored JavaScript to execute whenever a visitor opens the affected page. The CNA does not disclose the rendering function or required breakout encoding.

CVE / CNA score 6.4 CVSS 3.1 · security@wordfence.com

NVD score Pending NVD has not published its own CVSS assessment.

Component: SKT Skill Bar
Plugin slug: skt-skill-bar
Affected: <= 2.6
Safe version: > 2.6
Published: Aug 05, 2026
Weakness: CWE-79 — Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

This CVE was published Aug 05, 2026 and is one of 5 known issues for this plugin.

What to do

Update, patch or deactivate.

Update SKT Skill Bar to a release after 2.6. The authoritative record links a trunk correction but does not identify the first fixed release. Review Contributor-authored skillwrapper shortcodes and remove nonconforming chart_size values.

A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

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.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

References

Primary and upstream sources

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