[IT-SecNots] [Security-news] Drupal core - Moderately critical - Improper validation - SA-CORE-2026-009

[security-news AT drupal.org]

View online: https://www.drupal.org/sa-core-2026-009

Project: Drupal core [1]
Date: 2026-June-02
Security risk: *Moderately critical* 11 ∕ 25
AC:Complex/A:User/CI:Some/II:Some/E:Theoretical/TD:Uncommon [2]
Vulnerability: Improper validation

Affected versions: <10.5.12 || >=10.6.0 <10.6.11 || >=11.2.0 <11.2.14 ||
 >=11.3.0 <11.3.12 || 11.0.* || 11.1.*
CVE IDs: CVE-2026-55808
Description: 
The JSON:API and REST modules allow you to upload image files to image
fields.

The validation rules check the file extension of the uploaded file but not
the file MIME type. This may allow a malicious user to upload a file that is
not an image.

Certain web-server configurations may serve the uploaded file with its actual
MIME type rather than an image type. This may lead to cross-site scripting
(XSS) or other unexpected behavior.

Solution: 
Install the latest version:

*Drupal 11*

 * If you use Drupal 11.3.x, update to Drupal 11.3.12 [3].
 * If you use Drupal 11.2.x, update to Drupal 11.2.14 [4].

*Drupal 10*

 * If you use Drupal 10.6.x, update to Drupal 10.6.11 [5].
 * If you use Drupal 10.5.x, update to Drupal 10.5.12 [6].

Drupal 11.1.x, Drupal 11.0.x, Drupal 10.4.x, and below are end-of-life and do
not receive security coverage. (Drupal 8 [7] and Drupal 9 [8] have both
reached end-of-life.)

Reported By: 
 * cantina_security [9]

Fixed By: 
 * Björn Brala (bbrala) [10]
 * Kim Pepper (kim.pepper) [11]
 * Lee Rowlands (larowlan) [12] of the Drupal Security Team

Coordinated By: 
 * Damien McKenna (damienmckenna) [13] of the Drupal Security Team
 * Greg Knaddison (greggles) [14] of the Drupal Security Team
 * Lee Rowlands (larowlan) [15] of the Drupal Security Team
 * Dave Long (longwave) [16] of the Drupal Security Team
 * Juraj Nemec (poker10) [17] of the Drupal Security Team
 * Jess  (xjm) [18] of the Drupal Security Team

Security
issue: 
https://git.drupalcode.org/security/185032-drupal-security/-/work_items/1
[19]
------------------------------------------------------------------------------
Contribution record [20]

[1] https://www.drupal.org/project/drupal
[2] https://www.drupal.org/security-team/risk-levels
[3] https://www.drupal.org/project/drupal/releases/11.3.12
[4] https://www.drupal.org/project/drupal/releases/11.2.14
[5] https://www.drupal.org/project/drupal/releases/10.6.11
[6] https://www.drupal.org/project/drupal/releases/10.5.12
[7] https://www.drupal.org/psa-2021-06-29
[8] https://www.drupal.org/psa-2023-11-01
[9] https://www.drupal.org/u/cantina_security
[10] https://www.drupal.org/u/bbrala
[11] https://www.drupal.org/u/kimpepper
[12] https://www.drupal.org/u/larowlan
[13] https://www.drupal.org/u/damienmckenna
[14] https://www.drupal.org/u/greggles
[15] https://www.drupal.org/u/larowlan
[16] https://www.drupal.org/u/longwave
[17] https://www.drupal.org/u/poker10
[18] https://www.drupal.org/u/xjm
[19]  
https://git.drupalcode.org/security/185032-drupal-security/-/work_items/1
[20]  
https://new.drupal.org/contribution-record?source_link=https%3A//www.drupal.org/node/3593385

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