CVE-2026-55803: Drupal core - Critical - PHP object injection - SA-CORE-2026-005

Published Jul 10, 2026
·
Updated

Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Drupal core allows Object Injection. This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0., from 0.0.0 to 11.1..

Affected Software

5 affected components
Drupal Drupal Core>=0.0.0<=10.5.12, >=10.6.0<=10.6.11, >=11.2.0<=11.2.14, >=11.3.0<=11.3.12, >=0.0.0<=11.0.*, >=0.0.0<=11.1.*
Drupal Drupal<10.5.12
Drupal Drupal>=10.6.0<10.6.11
Drupal Drupal>=11.0.0<11.2.14
Drupal Drupal>=11.3.0<11.3.12

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Drupal core to a version that resolves this vulnerability.

    Fixed in 10.5.12
  2. Upgrade

    Upgrade Drupal core to a version that resolves this vulnerability.

    Fixed in 10.6.11
  3. Upgrade

    Upgrade Drupal core to a version that resolves this vulnerability.

    Fixed in 11.2.14
  4. Upgrade

    Upgrade Drupal core to a version that resolves this vulnerability.

    Fixed in 11.3.12
  5. Upgrade

    Upgrade Drupal core to a version that resolves this vulnerability.

    Fixed in 11.0.*
  6. Upgrade

    Upgrade Drupal core to a version that resolves this vulnerability.

    Fixed in 11.1.*
  7. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch SA-CORE-2026-005

Event History

Jul 10, 2026
CVE Published
via MITRE·09:46 PM
Data Sourced
via MITRE·09:46 PM
DescriptionWeakness
Data Sourced
via NVD·10:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-55803?

CVE-2026-55803 has a risk score of 80, indicating a critical vulnerability.

2

How do I fix CVE-2026-55803?

To fix CVE-2026-55803, update your Drupal core to a patched version above 10.5.12 or 11.3.12.

3

Which versions of Drupal are affected by CVE-2026-55803?

CVE-2026-55803 affects Drupal core versions from 0.0.0 to 10.5.12, 10.6.0 to 10.6.11, 11.2.0 to 11.2.14, and 11.3.0 to 11.3.12.

4

What type of vulnerability is CVE-2026-55803?

CVE-2026-55803 is classified as a PHP object injection vulnerability due to improperly controlled modification of object attributes.

5

What impact does CVE-2026-55803 have on Drupal installations?

CVE-2026-55803 can lead to unauthorized access or manipulation of objects within Drupal installations.

Company

Resources

Contact

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