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CVE-2026-8867

Post Categories Gallery <= 1.0.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

Published: May 27, 2026Updated: May 27, 2026 Sources: CVE List NVD
NVD MITRE
6.4CVSS
MEDIUM

The Post Category Gallery plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'postcategorygallery' shortcode in versions up to, and including, 1.0.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes (such as total_width, color_scheme, and caption_font_size) inside the sc_horcatbar() function, which are concatenated directly into HTML attribute values. 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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None

Weaknesses

CWE-79

Affected Products

Post Categories Gallery
fides-it

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://plugins.trac.wordpress.org/browser/post-category-gallery/trunk/horcatbar.php#L79
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/post-category-gallery/trunk/horcatbar.php#L97
plugins.trac.wordpress.org
https://www.wordfence.com/threat-intel/vulnerabilities/id/f439718e-4a3d-4dc9-a16c-6b655480dde6?source=cve
wordfence.com

Timeline

Published
May 27, 2026
Last Updated
May 27, 2026

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