CVE-2026-55808 | Drupal core - Moderately critical - Improper validation - SA-CORE-2026-009

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Cross-Site Scripting (XSS). 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.*.

Published: 2026-07-10 Last update: 2026-07-16 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-55808 is rated Low Risk (23.6/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.16%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-55808

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-07-17 0.13% 0.16% +0.03%
2 2026-07-14 0.15% 0.13% -0.02%
3 2026-07-11 — 0.15% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-55808

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.3 2.7 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-55808

GitHub Security Advisory for CVE-2026-55808

GHSA-9wh5-5mcm-hf2j · Severity: medium — Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")...

Affected software / configurations for CVE-2026-55808

Vendor Product Version Raw CPE
drupal drupal < 10.5.12 cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
drupal drupal >= 10.6.0, < 10.6.11 cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
drupal drupal >= 11.0.0, < 11.2.14 cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
drupal drupal >= 11.3.0, < 11.3.12 cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*

References for CVE-2026-55808

URL Tags
https://www.drupal.org/sa-core-2026-009 Vendor Advisory
cvelogic Threat Intelligence