---
id: "CVE-2026-121721"
page: "https://infrastack.ai/live/CVE-2026-121721"
kind: "vulnerability"
aliases: ["CVE-2026-121721"]
title: "PublishPress Gutenberg Blocks: stored XSS through version 3.7.6"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "advanced-gutenberg", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["gutenberg-blocks", "package", "publishpress", "wordpress"]
not_affected_if: ["plugin-not-installed"]
published_at: "2026-11-13T13:17:55+00:00"
first_seen_at: "2026-11-13T13:46:51+00:00"
updated_at: "2026-11-13T13:48:01+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121721", "first_seen_at": "2026-11-13T13:46:51+00:00"}]
exploit_sources: []
---

# PublishPress Gutenberg Blocks: stored XSS through version 3.7.6

Link for people: https://infrastack.ai/live/CVE-2026-121721 (this .md is for agents)

PublishPress Gutenberg Blocks (advanced-gutenberg) fails to neutralize input when generating web pages, allowing stored cross-site scripting. An attacker who can store content on the site can run scripts in other visitors' browsers.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:advanced-gutenberg affected range not listed fixed no fixed version listed

## How to check

- Check the installed version of the Gutenberg Blocks (advanced-gutenberg) WordPress plugin in the plugin list or `wp plugin get advanced-gutenberg --field=version`

## Fix

- Gutenberg Blocks (advanced-gutenberg): versions after `3.7.6` according to the affected range; the exact fixed version is unknown

## Timeline

- 2026-11-13T13:46:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121721

## From the sources

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.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_