CVE-2026-3577 Keep Backup Daily <= 2.1.2 - Authenticated (Admin+) Stored Cross-Site Scripting via Backup Title
Authenticated administrators can inject arbitrary scripts via backup titles, leading to code execution when other admins view the backup list.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3577?
CVE-2026-3577 is a medium-severity cross-site scripting vulnerability in fahadmahmood Keep Backup Daily, published on 20 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-3577?
How do I fix CVE-2026-3577?
No fix has been published for CVE-2026-3577 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-3577 being exploited?
There is no known exploitation of CVE-2026-3577 in the wild and no public exploit code.
Sources
Also known as GHSA-r766-3w4j-mh86.