What is CVE-2026-1854?

CVE-2026-1854 is a medium-severity vulnerability in Nosoycesaros Post Flagger, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-03-21.

How severe is CVE-2026-1854?

Medium severity. CVSS v3 base score is 6.4 out of 10.

XSS in Nosoycesaros Post Flagger

CVE-2026-1854

The Post Flagger plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'flag' shortcode in all versions up to, and including, 1.1 due to insufficient input sanitization and output escaping on user supplied attr…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (14.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Nosoycesaros Post Flagger — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.wordfence.com/threat-intel/vulnerabilities/id/1653e5a9-d2bb-42e3-be0d-27356…
plugins.trac.wordpress.org/browser/post-flagger/trunk/post-flagger.php
wordpress.org/plugins/post-flagger/
plugins.trac.wordpress.org/browser/post-flagger/tags/1.1/post-flagger.php

Frequently asked questions

What is CVE-2026-1854?: CVE-2026-1854 is a medium-severity vulnerability in Nosoycesaros Post Flagger, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-03-21.
How severe is CVE-2026-1854?: Medium severity. CVSS v3 base score is 6.4 out of 10.