What is CVE-2016-9451?

CVE-2016-9451 is a medium-severity vulnerability in Drupal, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.8/10. Published 2016-11-25.

How severe is CVE-2016-9451?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Is CVE-2016-9451 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Open Redirect in Drupal

CVE-2016-9451

Confirmation forms in Drupal 7.x before 7.52 make it easier for remote authenticated users to conduct open redirect attacks via unspecified vectors.

Vulnerability class: Open Redirect

Published 2016-11-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.015 (73.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Drupal — versions 7.0, 7.1, 7.2

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

Public proof-of-concept exploits

ARPSyndicate/cvemon

References

www.debian.org/security/2016/dsa-3718 (vendor-advisory)
www.securityfocus.com/bid/94367 (VDB Entry, Third Party Advisory, vdb-entry)
www.drupal.org/SA-CORE-2016-005 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2016-9451?: CVE-2016-9451 is a medium-severity vulnerability in Drupal, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 6.8/10. Published 2016-11-25.
How severe is CVE-2016-9451?: Medium severity. CVSS v3 base score is 6.8 out of 10.
Is CVE-2016-9451 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.