CVE-2023-28361 — A Cross-site WebSocket Hijacking (CSWSH) vulnerability found in UniFi OS 2

A Cross-site WebSocket Hijacking (CSWSH) vulnerability found in UniFi OS 2.5 and earlier allows a malicious actor to access certain confidential information by persuading a UniFi OS user to visit a malicious webpage.Affected Products:Cloud Key Gen2Cloud Key Gen2 PlusUNVRUNVR Prof

01What is this vulnerability?

A Cross-site WebSocket Hijacking (CSWSH) vulnerability found in UniFi OS 2.5 and earlier allows a malicious actor to access certain confidential information by persuading a UniFi OS user to visit a malicious webpage.Affected Products:Cloud Key Gen2Cloud Key Gen2 PlusUNVRUNVR ProfessionalUDMUDM ProfessionalUDM SEUDRMitigation:Update affected products to UniFi OS 3.0.13 or later.

02Affected products

Vendor	Product	Versions
n	a / UniFi OS	Fixed in UniFi OS 3.0.13 or later.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-05-11T00:00:00.000Z
• Last modified: 2025-01-27T16:44:43.627Z

09References

• community.ui.com — https://community.ui.com/releases/Security-Advisory-Bulletin-030-030/f9de9e65-58…