CVE-2026-34530Public exploitNetwork attack vector

Stored XSS via unescaped branding template

Published Apr 1, 2026 · Updated Apr 1, 2026

Stored XSS in the SPA index page in File Browser before 2.62.2 allows remote authenticated users to run JavaScript in visitors' browsers. The http/static.go handler renders branding.Name into index.html with Go text/template, which performs no context-aware HTML escaping. Administrative access is required to persist a branding payload, but every visitor, including unauthenticated users, receives the script and exposes browser-accessible data.

CVSS severity6.9
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the SPA index page in File Browser before 2.62.2 allows remote authenticated users to run JavaScript in visitors' browsers. The http/static.go handler renders branding.Name into index.html with Go text/template, which performs no context-aware HTML escaping. Administrative access is required to persist a branding payload, but every visitor, including unauthenticated users, receives the script and exposes browser-accessible data.

The record

CVE
CVE-2026-34530
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
File Browser Contributors
Product
File Browser
Classifications
T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

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

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 2.62.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

File Browser Contributors · File Browserversion=< 2.62.2

Published CVSS scores

6.9GitHubCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1059.007Command and Scripting Interpreter JavaScript/JScript

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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