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VulnerabilityPublished

CVE-2026-122078: drupal/extended_html_filter · The Extended HTML Filter module allows using style attributes in CKEditor

Affects drupal/extended_html_filterSource GCVE Database

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Not known to be exploited : upgrade to 1.0.4 soon.

Data as of 4 Nov 2026, 21:07 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch
Available – fixed in 1.0.4

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.

What to do

Upgrade drupal/extended_html_filter to 1.0.4.

Affected software

ProductAffectedFixed in
Packagist https //packages.drupal.org/8drupal/extended_html_filterAffected
  • <1.0.4
Fixed in
  • 1.0.4

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade the Extended HTML Filter module to version 1.0.4 or later, where the vulnerability is fixed. No additional mitigation is required if this update is applied.

Description

The Extended HTML Filter module for Drupal allows the use of style attributes in CKEditor. Its XSS filter does not sufficiently sanitize certain HTMX attributes, leading to a cross-site scripting (XSS) vulnerability. Exploitation requires an attacker to be able to insert HTML with specific attributes. A fix is available in version 1.0.4.

References

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