CVE-2026-6366: Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Drupal

Routine

MEDIUM 6.6UPGRADE

CVE-2026-6366 is a medium-severity flaw (CVSS 6.6) affecting drupal. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Drupal core allows Object Injection. This issue affects Drupal core: from 8.0.0 before 10.5.9, from 10.6.0 before 10.6.7, from 11.0.0 before 11.2.11, from 11.3.0 before 11.3.7.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.6 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-915
Published	2026-05-19
Last modified	2026-07-24

Publisher (CNA): Drupal.org · Vendor: drupal

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-19 23:16 UTCPublished CVE record published
2026-07-24 08:10 UTCUpdated Record last modified

drupal drupal UPGRADE

Affected: >= 8.0.0 and < 10.5.9 · >= 10.6.0 and < 10.6.7 · >= 11.0.0 and < 11.2.11 · >= 11.3.0 and < 11.3.7

Fixed in: 10.5.9, 10.6.7, 11.2.11, 11.3.7

Safe to downgrade to: a release before 8.0.0

1. Check installed version

apt-cache policy drupal || rpm -q drupal || drupal --version

2. UPGRADE to 10.5.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade drupal

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade drupal

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 8.0.0 (Debian / Ubuntu)

apt-cache madison drupal sudo apt install drupal=<VERSION_BEFORE_8.0.0> sudo apt-mark hold drupal

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list drupal sudo dnf downgrade drupal-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add drupal

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Official advisories

Drupal Security: Drupal core - Moderately critical - Gadget Chain - SA-CORE-2026-002 2026-04-15

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-6366?

drupal: upgrade to 10.5.9, 10.6.7, 11.2.11, 11.3.7. Exact commands for each OS are on this page.

Is CVE-2026-6366 being exploited?

CVE-2026-6366 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-6366 affect?

CVE-2026-6366 affects drupal. Severity is medium (CVSS 6.6). Improperly Controlled Modification of Dynamically-Determined Object Attributes vulnerability in Drupal Drupal core allows Object Injection. This issue affects Drupal core: from 8.0.0 before 10.5.9, from 10.6.0 before 10.6.7, from 11.0.0 be

How urgent is CVE-2026-6366?

Priority 32/100. No elevated risk signals yet.

Software pages

Drupal vulnerabilities

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References

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