---
id: "CVE-2026-87939"
kind: "vulnerability"
aliases: ["CVE-2026-87939"]
title: "Drupal Feed Block: stored XSS in feed rendering"
severity: "medium"
cvss: 4.2
epss: 0.00156
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["cms", "drupal", "other", "php"]
not_affected_if: ["module-not-installed"]
published_at: "2026-10-22T02:17:03+00:00"
first_seen_at: "2026-10-23T21:57:30+00:00"
updated_at: "2026-10-25T04:41:25+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87939", "first_seen_at": "2026-10-23T21:57:30+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-87939", "first_seen_at": "2026-10-24T07:15:52+00:00"}]
---

# Drupal Feed Block: stored XSS in feed rendering

The Drupal Feed Block module lets input be stored and later rendered on a page without proper escaping. An attacker who can submit that input can run script in the browser of anyone who views the page.

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

## How to check

- Check the installed Feed Block version with `drush pm:list --filter=feed_block` or in the Drupal admin under Extend.
- Confirm whether the site uses the Feed Block module at all.

## Fix

- Upgrade Feed Block to a release newer than `2.0.2` on the 2.x line or newer than `3.0.2` on the 3.x line; the sources do not name the exact fixed version.

## Timeline

- 2026-10-23T21:57:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-87939
- 2026-10-24T07:15:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-87939

## From the sources

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Feed Block allows Stored XSS. This issue affects Feed Block versions: from 0.0.0 to 2.0.2, from 3.0.0 to 3.0.2.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_