PT-2026-50608 · Drupal · Drupal

Catch + 9 · CVE-2026-55806 · Published 2026-06-17 · Updated 2026-07-19

Positive Technologies (AI Summary)

CVSS v3.1

5.9

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Drupal core (affected versions not specified)

Description The rebuild.php front controller, used to clear caches and rebuild the container when a site is in an unexpected condition, fails to correctly validate the Host header against trusted host patterns. This flaw can lead to cache poisoning, where a cache is filled with a malicious response, or an open redirect, which sends users to an attacker-controlled domain.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Open Redirect

Weakness Enumeration

CWE-601

Related Identifiers

BIT-DRUPAL-2026-55806

CVE-2026-55806

DRUPAL-CORE-2026-007

Affected Products

Drupal

References · 10

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55806.json · Exploit
• https://osv.dev/vulnerability/DRUPAL-CORE-2026-007 · Vendor Advisory
• https://drupal.org/sa-core-2026-007 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-55806 · Security Note
• https://osv.dev/vulnerability/BIT-drupal-2026-55806 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-55806 · Vendor Advisory
• https://git.drupalcode.org/project/drupal · Note
• https://twitter.com/autumn_good_35/status/2067620772399776007 · Twitter Post
• https://drupal.org/project/drupal · Note
• https://t.me/cveNotify/195895 · Telegram Post