CVE-2026-77554
CriticalA malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi Talk Application to execute a Command Injection on the host device.
Published Aug 26, 2026 · Updated Aug 28, 2026 · Also known as EUVD-2026-66403, GHSA-7p8g-c87g-jxrv
Key Facts
Patch in the next maintenance window- CVE-2026-77554 is a critical-severity vulnerability (CVSS 10.0 v3.1) affecting UniFi Talk application.
- It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
- EPSS estimates a 1.6% probability of exploitation in the next 30 days.
- Fixed versions are available, including UniFi Talk application 5.3.2.
- Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
CVSS v3.1
10.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
1.6%
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
None known
Get the full CVE-2026-77554 brief as a PDF
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Description
A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi Talk Application to execute a Command Injection on the host device.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| UniFi Talk application | See advisory | 5.3.2 |
Patched Releases
UniFi Talk application
5.3.2
Timeline
Publicly disclosed
Aug 26, 2026
Last updated
Aug 28, 2026
Weakness Type
- CWE-20 Improper Input Validation
References
FAQ
Common Questions.
A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi Talk Application to execute a Command Injection on the host device.
Affected: UniFi Talk application. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including UniFi Talk application 5.3.2.
Brandefense priority: patch in the next maintenance window, because of its high severity, although no exploitation is known.
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