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Fencer Vulns
medium 5.4

CVE-2026-55808 json

Drupal core - Moderately critical - Improper validation - SA-CORE-2026-009

published 2026-06-17 4 mo ago modified 2026-10-25 14 d ago also BIT-drupal-2026-55808 , DRUPAL-CORE-2026-009 , EUVD-2026-43085

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits
0
none known

Summary

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.*.

Patch / fix

  • bitnami drupal 10.5.12, 10.6.11, 11.2.14, 11.3.12
  • packagist drupal/core 10.5.12, 10.6.11, 11.1.0, 11.2.0, 11.2.14, 11.3.12
  • Drupal Drupal core 10.5.12, 10.6.11, 11.2.14, 11.3.12

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-55808 updated cvss 8.1

drupal: Drupal core: Cross-site Scripting (XSS) via improper input neutralization

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
OSV 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami drupal
<10.5.12
>=10.6.0, <10.6.11
>=11.0.0, <11.2.14
>=11.3.0, <11.3.12
10.5.12
10.6.11
11.2.14
11.3.12
packagist drupal/core
<10.5.12
>=10.6.0, <10.6.11
>=11.2.0, <11.2.14
>=11.3.0, <11.3.12
>=11.0.0, <11.1.0
>=11.1.0, <11.2.0
10.5.12
10.6.11
11.2.14
11.3.12
11.1.0
11.2.0

Affected products

  • Drupal Drupal core

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.