CVE-2026-75526Network attack vectorHinoki check available

Stored XSS via unescaped exception heading

Published Aug 20, 2026 · Updated Aug 20, 2026

Cross-site scripting in django CMS 5.0.8 allows remote authenticated users to execute script in an editor's browser via stored plugin content. In cms/plugin_rendering.py, ContentRenderer.render_exception builds a cms-rendering-exception heading from get_short_description(), exception text, placeholder, or placeholder.source and returns it through mark_safe without escaping that heading. Reachability requires attacker-controlled stored HTML and a plugin-rendering failure during edit mode, so execution is limited to staff viewing the affected placeholder.

CVSS severity4.4
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Cross-site scripting in django CMS 5.0.8 allows remote authenticated users to execute script in an editor's browser via stored plugin content. In cms/plugin_rendering.py, ContentRenderer.render_exception builds a cms-rendering-exception heading from get_short_description(), exception text, placeholder, or placeholder.source and returns it through mark_safe without escaping that heading. Reachability requires attacker-controlled stored HTML and a plugin-rendering failure during edit mode, so execution is limited to staff viewing the affected placeholder.

The record

CVE
CVE-2026-75526
Published
Aug 20, 2026
Updated
Aug 20, 2026
Vendor
django CMS Association
Product
django CMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 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=>= 5.0.8, < 5.0.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

django CMS Association · django CMSversion=>= 5.0.8, < 5.0.9

Published CVSS scores

4.4GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript

Public exploit references

No public exploit references are available in this record.

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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