The Sticky plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `cvmh-sticky...

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.

Basic information

Type
unreviewed
Severity
medium
Advisory on GitHub
Open advisory ↗
Repository advisory
Source code
Not specified
Published (advisory)
2026-05-20 03:31:34 UTC
Updated
2026-05-20 03:31:46 UTC
NVD published
2026-05-19

EPSS Score

Score Percentile
0.03% 9.50%

CVSS Scores

Base score Version Severity Vector
6.4 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.

Identifiers

CWEs

CWE id Name
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References

cvelogic Threat Intelligence