CVE-2016-3165

Drupal Form API ignores access restrictions on submit buttons

7.5 HighFix available

The Form API in Drupal 6.x before 6.38 ignores access restrictions on submit buttons, which might allow remote attackers to bypass intended access restrictions by leveraging permission to submit a form with a button that has "#access" set to FALSE in the server-side form definition.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: High
Availability: None

Exploit likelihood

1.36%Up 0.1 points since Feb 4, 2022

What each source reports

NVD Score used 7.5

Record: CVE-2016-3165
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:P/A:N
Weakness: CWE-284
Updated: 2026-11-02

CVE List No score

Record: CVE-2016-3165
Updated: 2026-11-02

EUVDEUVD-2022-2376 No score

Record: EUVD-2022-2376
Updated: 2026-11-03

GitHub AdvisoriesGHSA-4gh5-3hqj-x3pj 7.5

Drupal Form API ignores access restrictions on submit buttons

Record: GHSA-4gh5-3hqj-x3pj
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness: CWE-284
Updated: 2026-11-02

OSV 7.5

Record: CVE-2016-3165
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated: 2026-11-02

OSVGHSA-4gh5-3hqj-x3pj 7.5

Drupal Form API ignores access restrictions on submit buttons

Record: GHSA-4gh5-3hqj-x3pj
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness: CWE-284
Updated: 2026-11-02

Affected products

drupal

Affected packages

Affected packages
Package	Affected	Fixed
`drupal/core` Packagist	6.0 up to 6.38	6.38
`drupal/drupal` Packagist	6.0 up to 6.38	6.38

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2016-3165 is a high vulnerability (CVSS 7.5) in Drupal, published April 12, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.36%, the 71st percentile. Fixed in drupal/core 6.38.