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TI-2026-81002 Aliases CVE-2026-116836GHSA-5c39-2376-cxh9

Stored XSS in Ubiquiti airMAX M allows adjacent-network privilege escalation

Priority LOW 39CWE-79Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

A stored cross-site scripting flaw, CWE-79, in Ubiquiti airMAX M devices lets a malicious actor on the adjacent network escalate privileges on the device. Exploitation requires certain conditions and user interaction. The attack complexity is low and no privileges are needed, and the impact to confidentiality, integrity and availability is high.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

Description from the CNA

A malicious actor with access to the adjacent network and under certain conditions could exploit a Stored Cross-Site Scripting (XSS) vulnerability found in airMAX M devices to escalate privileges on the device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00194 9th percentileScored 2026-11-07
Fix Fixed airMAX M (Ubiquiti Inc): 6.3.26

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
UbiquitiairMAX Mbefore 6.3.266.3.26Patch availableCNA
  • airMAX M VendorUbiquiti Affected before 6.3.26 Fixed in 6.3.26 Patch available CNA

Remediation

Update Ubiquiti airMAX M devices to version 6.3.26, the fixed release. Versions before 6.3.26 are affected.

Written with Claude Haiku 5.5 from the sources below · 2026-11-03

  • Fix · CNA airMAX M (Ubiquiti Inc) Fixed in 6.3.26

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Ubiquiti airMAX M 6.3.26

    4 records Highest priority Priority MEDIUM 1 MEDIUM, 3 LOW

    Other records, highest priority first

    • TI-2026-81004 Ubiquiti airMAX M CSRF flaw allows command injection on devicesPriority MEDIUM 40
    • TI-2026-81003 Heap-based buffer overflow in Ubiquiti airMAX and LTU devicesPriority LOW 39
    • TI-2026-81005 Cross-site request forgery in Ubiquiti airMAX M devicesPriority LOW 30
    Show all 4 records →

Timeline

  1. 2026-10-27 Threatist record created from CVE-2026-116836
  2. 2026-10-27 Alias added: GHSA-5c39-2376-cxh9
  3. 2026-10-27 Priority changed: MEDIUM → LOW
  4. 2026-11-03 CISA SSVC decision points changed

References

Other 1

  • TI-2026-27142 Improper input validation in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-27141 Path traversal in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
  • TI-2026-27140 Improper access control in Ubiquiti UniFi OS Server KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-05027 On certain Ubiquiti devices, Command Injection exists via a GET request to stainfo.cgi… KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-19187 AirControl 1.4.2 - PreAuth Remote Code Execution CVSS 4.0CRITICAL 9.3
  • TI-2015-07644 Ubiquiti airOS HTTP(S) unauthenticated arbitrary file upload CVSS 3.0CRITICAL 9.8
See all 206 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences