[IT-SecNots] [Security-news] Flag attendance field - Critical - PHP object injection - SA-CONTRIB-2026-049

[security-news AT drupal.org]

View online: https://www.drupal.org/sa-contrib-2026-049

Project: Flag attendance field [1]
Date: 2026-June-17
Security risk: *Critical* 19 ∕ 25
AC:None/A:User/CI:All/II:All/E:Theoretical/TD:Default [2]
Vulnerability: PHP object injection

Affected versions: <1.2
CVE IDs: CVE-2026-55809
Description: 
The Flag attendance field module gives you the ability to add attendance by
depending on Flag module [3].

flag_attendance_field stores some data as PHP-serialized strings. In some
situations, malicious data can be written directly to the field. This can
lead to an object injection vulnerability when the data are unserialized.

This vulnerability is mitigated by the fact that an attacker must have
permission to edit a content entity with an attached flag_attendance_field
field. In addition, the core JSON:API module must be enabled with the option
"Accept all JSON:API create, read, update, and delete operations", which is
not the default, or the attacker needs some other way to edit field values
directly.

Solution: 
Install the latest version:

 * If you use the Flag attendance field module for Drupal, upgrade to Flag
   attendance field 8.x-1.2 [4].

Reported By: 
 * Drew Webber (mcdruid) [5] of the Drupal Security Team

Fixed By: 
 * Anas Mawlawi (anas_maw) [6]
 * Benji Fisher (benjifisher) [7] of the Drupal Security Team
 * Drew Webber (mcdruid) [8] of the Drupal Security Team

Coordinated By: 
 * Benji Fisher (benjifisher) [9] of the Drupal Security Team
 * Drew Webber (mcdruid) [10] of the Drupal Security Team
 * Jess  (xjm) [11] of the Drupal Security Team

Security
issue: 
https://git.drupalcode.org/security/185193-flag_attendance_field-security/-/work…
[12]
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Contribution record [13]

[1] https://www.drupal.org/project/flag_attendance_field
[2] https://www.drupal.org/security-team/risk-levels
[3] https://www.drupal.org/project/flag
[4] https://www.drupal.org/project/flag_attendance_field/releases/8.x-1.2
[5] https://www.drupal.org/u/mcdruid
[6] https://www.drupal.org/u/anas_maw
[7] https://www.drupal.org/u/benjifisher
[8] https://www.drupal.org/u/mcdruid
[9] https://www.drupal.org/u/benjifisher
[10] https://www.drupal.org/u/mcdruid
[11] https://www.drupal.org/u/xjm
[12]  
https://git.drupalcode.org/security/185193-flag_attendance_field-security/-/work_items/1
[13]  
https://new.drupal.org/contribution-record?source_link=https%3A//www.drupal.org/node/3600740

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