CVE-2026-1854

MEDIUM 6.4

Post Flagger <= 1.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'slug' Shortcode Attribute

CVSS Score

6.4

EPSS Score

0.0%

EPSS Percentile

0th

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 attributes. 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.

CWE	CWE-79
Vendor	nosoycesaros
Product	post flagger
Published	Mar 21, 2026
Last Updated	Apr 8, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

nosoycesaros / Post Flagger

0 ≤ 1.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/1653e5a9-d2bb-42e3-be0d-27356fbde2ce?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/post-flagger/trunk/post-flagger.php#L66 wordpress.org: https://wordpress.org/plugins/post-flagger/ plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/post-flagger/tags/1.1/post-flagger.php#L66

Credits

zakaria