Vulnerability · Published Oct 22, 2026 · Assigned by drupal
CVE-2026-87939Feed Block - Moderately critical - Cross-site scripting - SA-CONTRIB-2026-137
Medium 4.2
In plain English
A medium-severity cross-site scripting in Feed Block from Drupal. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.2Medium
Exploit odds (30 days)0.2%top 90.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist:https://packages.drupal.org/8 | drupal/feed_block | 2.0.2, 3.0.2 | DRUPAL-CONTRIB-2026-137 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Drupal | Feed Block | 0.0.0 – before 2.0.23.0.0 – before 3.0.2 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N