The Sticky plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `cvmh-sticky` shortcode `readmoretext` attribute in versions up to and including 2.5.6. This is due to insufficient input sanitization and output escaping in the `cvmh_sticky_front_render()` function — the `readmoretext` attribute value is passed through `apply_filters()` and directly concatenated into the HTML output without any escaping function such as `esc_html()`. 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 a page containing the injected shortcode.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
cvmh Sticky unaffected
Version Status Constraints
0 affected ≤ 2.5.6

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://plugins.trac.wordpress.org/browser/sticky/tags/2.5.6/includes/functions.php#L118 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/sticky/tags/2.5.6/includes/shortcode.php#L7 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/sticky/trunk/includes/functions.php#L118 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/sticky/trunk/includes/shortcode.php#L7 cve-icon cve-icon
https://www.wordfence.com/threat-intel/vulnerabilities/id/135783c5-8175-4775-a013-f1e2bef04479?source=cve cve-icon cve-icon
History

Wed, 20 May 2026 02:15:00 +0000

Type Values Removed Values Added
Description The Sticky plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `cvmh-sticky` shortcode `readmoretext` attribute in versions up to and including 2.5.6. This is due to insufficient input sanitization and output escaping in the `cvmh_sticky_front_render()` function — the `readmoretext` attribute value is passed through `apply_filters()` and directly concatenated into the HTML output without any escaping function such as `esc_html()`. 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 a page containing the injected shortcode.
Title Sticky <= 2.5.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'readmoretext' Shortcode Attribute
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-05-20T01:25:46.486Z

Reserved: 2026-04-15T20:19:43.983Z

Link: CVE-2026-6397

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-20T02:16:37.770

Modified: 2026-05-20T02:16:37.770

Link: CVE-2026-6397

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-20T03:30:16Z

Weaknesses