[IT-SecNots] [Security-news] Drupal core - Moderately critical - Gadget chain - SA-CORE-2026-006

[security-news AT drupal.org]

View online: https://www.drupal.org/sa-core-2026-006

Project: Drupal core [1]
Date: 2026-June-08
Security risk: *Moderately critical* 14 ∕ 25
AC:Complex/A:Admin/CI:All/II:All/E:Theoretical/TD:Uncommon [2]
Vulnerability: Gadget chain

Affected versions: <10.5.12 || >=10.6.0 <10.6.11 || >=11.2.0 <11.2.14 ||
 >=11.3.0 <11.3.12 || >=11.4.0 <11.4.0-rc2 || 11.0.* || 11.1.*
CVE IDs: CVE-2026-55804
Description: 
Drupal core contains a chain of methods that could be exploitable when an
insecure deserialization vulnerability exists on the site. This so-called
"gadget chain" presents no direct threat, but is a vector that can be used to
achieve remote code execution or SQL injection if the application
deserializes untrusted data due to another vulnerability.

This issue is not directly exploitable.

This issue is mitigated by the fact that in order for it to be exploitable, a
separate vulnerability must be present to allow an attacker to pass unsafe
input to unserialize().

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: 
 * Michael Maturi (michaelmaturi) [9]

Fixed By: 
 * Lee Rowlands (larowlan) [10] of the Drupal Security Team
 * Drew Webber (mcdruid) [11] of the Drupal Security Team
 * Mohit Aghera (mohit_aghera) [12]

Coordinated By: 
 * Anna Kalata (akalata) [13] of the Drupal Security Team
 * Benji Fisher (benjifisher) [14] of the Drupal Security Team
 * cilefen  (cilefen) [15] of the Drupal Security Team
 * Greg Knaddison (greggles) [16] of the Drupal Security Team
 * Lee Rowlands (larowlan) [17] of the Drupal Security Team
 * Dave Long (longwave) [18] of the Drupal Security Team
 * Drew Webber (mcdruid) [19] of the Drupal Security Team
 * Juraj Nemec (poker10) [20] of the Drupal Security Team
 * Jess  (xjm) [21] of the Drupal Security Team

Security
issue: 
https://git.drupalcode.org/security/185171-drupal-security/-/work_items/1
[22]
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Contribution record [23]

[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/michaelmaturi
[10] https://www.drupal.org/u/larowlan
[11] https://www.drupal.org/u/mcdruid
[12] https://www.drupal.org/u/mohit_aghera
[13] https://www.drupal.org/u/akalata
[14] https://www.drupal.org/u/benjifisher
[15] https://www.drupal.org/u/cilefen
[16] https://www.drupal.org/u/greggles
[17] https://www.drupal.org/u/larowlan
[18] https://www.drupal.org/u/longwave
[19] https://www.drupal.org/u/mcdruid
[20] https://www.drupal.org/u/poker10
[21] https://www.drupal.org/u/xjm
[22]  
https://git.drupalcode.org/security/185171-drupal-security/-/work_items/1
[23]  
https://new.drupal.org/contribution-record?source_link=https%3A//www.drupal.org/node/3594118

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