# CVE-2026-34910: UniFi OS Server - RCE

> Live exploitation tracking for CVE-2026-34910 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2026-34910

## Key facts

- **Exploitation phase:** Active Exploitation. The vulnerability is actively exploited at scale across the internet, often via automated tools and large attack campaigns.
- **CVSS score:** 10.0
- **Public exploit available:** Yes
- **Affected products:** Ubiquiti Inc UniFi OS Server, Ubiquiti Inc UDM, Ubiquiti Inc UDM-Pro, Ubiquiti Inc UDM-SE, Ubiquiti Inc UDM-Pro-Max, Ubiquiti Inc UDM-Beast
- **Weaknesses:** CWE-78 (Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection'))
- **Tags:** firewall, nas

## Description

A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS devices to execute a Command Injection.

## CrowdSec analysis

[CVE-2026-34910](https://euvd.enisa.europa.eu/vulnerability/CVE-2026-34910) is a critical improper input validation vulnerability affecting Ubiquiti UniFi OS Server and numerous UniFi OS devices, including UDM, UNVR, UNAS, and UCG models. A network-accessible attacker can exploit this flaw without authentication or user interaction to inject and execute arbitrary commands, potentially achieving remote code execution and compromising the confidentiality, integrity, and availability of affected systems.

CrowdSec has been tracking this vulnerability and its exploits since 29th of August 2026.

CrowdSec network data shows that most actors exploiting CVE-2026-34910 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature.
In addition, according to the CrowdSec network, attack volume against CVE-2026-34910 has dipped slightly compared to the previous week. Although still commonly targeted, the decline suggests a cooling-off period. Long-term relevance remains, but attention is waning.

Attackers target the `/api/auth/validate-sso/..%2f..%2f..%2fproxy/users/api/v2/ucs/update/latest_package` endpoint, using encoded path traversal to reach the update API. The `pkg_name` parameter is injected with shell commands such as `nslookup`, enabling unauthenticated remote command execution and out-of-band DNS callbacks.

## Timeline

- 2026-05-22: CVE Published. CVE-2026-34910 is published to NVD.
- 2026-06-23: CISA KEV. CVE-2026-34910 is added to the Known Exploited Vulnerabilities catalog by CISA.
- 2026-06-26: CISA Remediation Deadline. Expiration of the CISA remediation deadline as described in [BOD 22-01](https://www.cisa.gov/news-events/directives/bod-22-01-reducing-significant-risk-known-exploited-vulnerabilities).
- 2026-08-29: Rule Released. CrowdSec releases a rule to detect CVE-2026-34910 exploitation attempts against the CrowdSec Network.
- 2026-09-16: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2026-34910 for the first time.

## References

- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34910
- https://www.pwndefend.com/2026/06/09/cve-2026-34910-exploitation-itw-building-a-botnet-mirai/
- https://community.ui.com/releases/Security-Advisory-Bulletin-064-064/84811c09-4cf4-42ab-bd61-cc994445963b
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-34910.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2026-34910) follows observed exploitation activity for CVE-2026-34910. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.