# 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.

- **Severity:** Medium 4.4 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 20 Mar 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-r766-3w4j-mh86

## 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 (Improper Neutralization of Input During Web Page Generation)

## 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.

## Is CVE-2026-3577 being exploited?

There is no known exploitation of CVE-2026-3577 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3577 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-3577 in the wild and no public exploit code.

Affected product: fahadmahmood Keep Backup Daily. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-3577/ (Markdown: https://insights.sbomify.com/CVE-2026-3577/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3577
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3577
- OSV: https://osv.dev/vulnerability/CVE-2026-3577

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3577/
Summaries are generated and may contain mistakes; the official description above is the record.