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CVE-2026-121721

WordPress Gutenberg Blocks plugin <= 3.7.6 - Cross Site Scripting (XSS) vulnerability

  • Medium 6.5

Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in PublishPress Gutenberg Blocks advanced-gutenberg allows Stored XSS.This issue affects Gutenberg Blocks: from n/a through 3.7.6.

Key facts

Published
13 Nov 2026
Last changed
13 Nov 2026
Assigned by
Patchstack
EPSS
0.17% likely to be exploited in the next 30 days, higher than 6.401% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: none; Automatable: no; Technical impact: partial

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 6.5CVSS 3.1, Mediumfrom the CNA (Patchstack)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

What to do

  • Update the WordPress Gutenberg Blocks plugin to the latest available version (at least 3.7.7).CNA solution statement

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

Stored XSS (CNA impact statement)

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
PublishPressGutenberg Blocks
  • Default status: unaffected
  • 0 up to and including 3.7.6 (affected); at 3.7.7 unaffected

Timeline

  1. 13 Nov 2026 Published

Weakness

Practice this bug class

HackZoneLabs has a hands-on lab on XSS (stored, reflected, DOM) (CWE-79).

Open the learning platform

References