CVE-2025-9851: Appointmind <= 4.1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting

Severity: medium (CVSS 6.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-09-17 · updated 2026-06-17
Weakness: CWE-79

Description

The Appointmind plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'appointmind_calendar' shortcode in all versions up to, and including, 4.1.0 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.

Affected products

gentlesource Appointmind: through 4.1.0

References

https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3359404%40appointmind&new=3359404%40appointmind&sfp_email=&sfph_mail=
https://www.wordfence.com/threat-intel/vulnerabilities/id/65d965ac-66ae-4c23-b9c2-335b93a140d9?source=cve

Get alerted when CVE-2025-9851 or the next vulnerability affects your stack