CVE-2026-39275Public exploitNetwork attack vector

Account takeover via unencoded field rendering

Published Aug 26, 2026 · Updated Aug 27, 2026

Stored XSS in Cockpit CMS 2.13.5 and earlier allows remote authenticated users to hijack accounts through crafted collection fields. The tag and select field renderers pass stored values to Vue's v-html sink in collection items.php without output encoding. Content-write API access or an editor session is required, and execution occurs when an administrator or editor views the affected item list, exposing session and CSRF tokens for replay.

CVSS severity6.1
Medium
EPSS probability0.28%
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 Cockpit CMS 2.13.5 and earlier allows remote authenticated users to hijack accounts through crafted collection fields. The tag and select field renderers pass stored values to Vue's v-html sink in collection items.php without output encoding. Content-write API access or an editor session is required, and execution occurs when an administrator or editor views the affected item list, exposing session and CSRF tokens for replay.

The record

CVE
CVE-2026-39275
Published
Aug 26, 2026
Updated
Aug 27, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
8.4Securify-AICVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie

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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