fahadmahmood Keep Backup Daily Plugin up to 2.1.2 on WordPress HTML Attribute sanitize_text_field val HTML injection

Summaryinfo

A vulnerability described as problematic has been identified in fahadmahmood Keep Backup Daily Plugin up to 2.1.2 on WordPress. This affects the function sanitize_text_field of the component HTML Attribute Handler. Executing a manipulation of the argument val can lead to HTML injection. The identification of this vulnerability is CVE-2026-3577. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in fahadmahmood Keep Backup Daily Plugin up to 2.1.2 on WordPress. It has been declared as problematic. This vulnerability affects the function sanitize_text_field of the component HTML Attribute Handler. The manipulation of the argument val with an unknown input leads to a html injection vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

The Keep Backup Daily plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the backup title alias (`val` parameter) in the `update_kbd_bkup_alias` AJAX action in all versions up to, and including, 2.1.2. This is due to insufficient input sanitization and output escaping. While `sanitize_text_field()` strips HTML tags on save, it does not encode double quotes. The backup titles are output in HTML attribute contexts without `esc_attr()`. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts via attribute injection that will execute whenever another administrator views the backup list page.

The weakness was shared by san6051. The advisory is available at wordfence.com. This vulnerability was named CVE-2026-3577 since 03/04/2026. The exploitation appears to be difficult. The attack can be initiated remotely. Additional levels of successful authentication are needed for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 2.1.1 eliminates this vulnerability.

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Productinfo

Type

• Backup Software

Vendor

• fahadmahmood

Name

• Keep Backup Daily Plugin

Version

• 2.1.0
• 2.1.1
• 2.1.2

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CPE 2.2info

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