PT-2026-26819 · WordPress · Post Flagger

Zakaria · CVE-2026-1854 · Published 2026-03-21 · Updated 2026-03-21

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Post Flagger plugin for WordPress versions prior to 1.2

Description The Post Flagger plugin for WordPress is susceptible to Stored Cross-Site Scripting through the 'flag' shortcode. Insufficient input sanitization and output escaping on user-supplied attributes allow authenticated attackers with contributor-level access or higher to inject arbitrary web scripts into pages. These scripts will execute when a user accesses the injected page.

Recommendations Update the Post Flagger plugin to version 1.2 or later.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-1854

Affected Products

Post Flagger

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-1854 · Security Note
• https://plugins.trac.wordpress.org/browser/post-flagger/trunk/post-flagger.php#L66 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/1653e5a9-d2bb-42e3-be0d-27356fbde2ce?source=cve · Note
• https://wordpress.org/plugins/post-flagger · Note
• https://plugins.trac.wordpress.org/browser/post-flagger/tags/1.1/post-flagger.php#L66 · Note
• https://twitter.com/CVEnew/status/2035237308824527365 · Twitter Post