Ubiquiti airMAX M: Stored cross-site scripting enables privilege escalation
Summary
Ubiquiti airMAX M wireless networking devices contain a stored cross-site scripting (XSS) vulnerability (CWE-79). An attacker with access to the adjacent network can store malicious script on the device, which runs when a user views the affected page, and can use this to escalate privileges on the device. Exploitation requires adjacent-network access and user interaction under certain conditions. The CVSS base score is 8.8 (v3.1), and the NVD record was still awaiting analysis at the time of research.
Affected
- airMAX M 6.3.24 and earlier (vendor advisory)
- airMAX M 6.3.25: unclear, treat as affected until Ubiquiti confirms
- CNA data: versions 0 to below 6.3.26
Fixed in
- airMAX M 6.3.26 or later
Workaround
- The vendor advisory lists no workaround; the firmware update is the documented remedy.
- General hardening (not vendor-verified): restrict access from untrusted adjacent networks, segment the network and monitor device logs for suspicious script content.
Exploitation
- No confirmed exploitation in the wild.
- No public proof of concept found.
- CISA KEV status: not listed.
- EPSS: 0.19 %.
Our recommendation
- Inventory airMAX M devices and their firmware versions.
- Update to airMAX M 6.3.26 or later and treat 6.3.25 as affected until Ubiquiti confirms otherwise.
- Restrict device management to a dedicated management VLAN with admin-only access.
- Remove or limit administrative access from guest, office or other untrusted networks.
- Patch the related CVE-2026-116837 (heap overflow, CVSS 8.8) and CVE-2026-116839 (CSRF, CVSS 7.1) in the same update.
- Check the vendor advisory and NVD for updates.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Ubiquiti Security Advisory Bulletin 071 uisp.community.ui.com
- VulDB CVE-2026-116836 vuldb.com
- VulDB vulnerability 427034 vuldb.com
- Feedly CVE-2026-116836 feedly.com
- Strix CVE-2026-116836 www.strix.ai
- Offseq Radar CVE-2026-116839 (CSRF, same bulletin) radar.offseq.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 10:16.
Original description (NVD)
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.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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