CVE-2025-9851: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in gentlesource Appointmind
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.
AI Analysis
Technical Summary
CVE-2025-9851 is a stored cross-site scripting vulnerability in the gentlesource Appointmind WordPress plugin (up to version 4.1.0). The issue stems from improper neutralization of input in the 'appointmind_calendar' shortcode, where user-supplied attributes are not properly sanitized or escaped. Authenticated attackers with contributor-level permissions or higher can inject arbitrary JavaScript that executes in the context of users visiting the compromised pages. This vulnerability can lead to limited confidentiality and integrity impacts but does not affect availability. The CVSS 3.1 base score is 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N).
Potential Impact
Successful exploitation allows authenticated users with contributor-level access or higher to inject and execute arbitrary scripts in the context of other users viewing the affected pages. This can lead to partial confidentiality and integrity compromise, such as session hijacking or content manipulation. There is no impact on availability. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict contributor-level access to trusted users only and consider disabling or removing the Appointmind plugin if possible. Monitor vendor channels for updates and apply patches promptly once released.
CVE-2025-9851: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in gentlesource Appointmind
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-9851 is a stored cross-site scripting vulnerability in the gentlesource Appointmind WordPress plugin (up to version 4.1.0). The issue stems from improper neutralization of input in the 'appointmind_calendar' shortcode, where user-supplied attributes are not properly sanitized or escaped. Authenticated attackers with contributor-level permissions or higher can inject arbitrary JavaScript that executes in the context of users visiting the compromised pages. This vulnerability can lead to limited confidentiality and integrity impacts but does not affect availability. The CVSS 3.1 base score is 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N).
Potential Impact
Successful exploitation allows authenticated users with contributor-level access or higher to inject and execute arbitrary scripts in the context of other users viewing the affected pages. This can lead to partial confidentiality and integrity compromise, such as session hijacking or content manipulation. There is no impact on availability. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict contributor-level access to trusted users only and consider disabling or removing the Appointmind plugin if possible. Monitor vendor channels for updates and apply patches promptly once released.
Technical Details
- Data Version
- 5.1
- Assigner Short Name
- Wordfence
- Date Reserved
- 2025-09-02T15:08:00.900Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 68ca1a3d571b2840ff0172f9
Added to database: 9/17/2025, 2:17:33 AM
Last enriched: 4/9/2026, 6:14:32 PM
Last updated: 5/10/2026, 1:48:17 AM
Views: 133
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