CVE-2026-22557Public exploitNetwork attack vector

Account takeover via captive-portal path traversal

Published Mar 19, 2026 · Updated Mar 19, 2026

Path traversal in affected Ubiquiti UniFi Network Application releases allows remote attackers to read local files through the guest portal. GuestServlet passes the attacker-controlled page_error parameter verbatim to the customized portal resource loader, which resolves traversal segments and streams the selected file. Exploitation requires a customized guest portal; exposed controller backups disclose administrative and managed-device credentials that enable account takeover.

CVSS severity10.0
Critical
EPSS probability28.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in affected Ubiquiti UniFi Network Application releases allows remote attackers to read local files through the guest portal. GuestServlet passes the attacker-controlled page_error parameter verbatim to the customized portal resource loader, which resolves traversal segments and streams the selected file. Exploitation requires a customized guest portal; exposed controller backups disclose administrative and managed-device credentials that enable account takeover.

The record

CVE
CVE-2026-22557
Published
Mar 19, 2026
Updated
Mar 19, 2026
Vendor
Ubiquiti Inc.
Product
UniFi Network Application
Classifications
CWE-22, T1190, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1.89 <10.1.89
  2. Affected versionversion=10.2.97 <10.2.97
  3. Affected versionversion=9.0.118 <9.0.118

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ubiquiti Inc. · UniFi Network Applicationversion=10.1.89 <10.1.89; version=10.2.97 <10.2.97; version=9.0.118 <9.0.118

Published CVSS scores

10.0HackerOneCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application
T1005Data from Local System

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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