CVE-2026-18986: CWE-79 Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") in Drupal Entity Browser

This vulnerability in Drupal Entity Browser (CVE-2026-18986) is classified as CWE-79, indicating improper neutralization of input leading to stored cross-site scripting (XSS). The flaw allows malicious input to be stored and later executed in the context of a user's browser when viewing affected pages. The issue affects all versions from the initial release (0.0.0) through 2.16.0. The CVSS vector indicates network attack vector, low attack complexity, high privileges required, user interaction required, and a scope change, with limited confidentiality and integrity impact and no availability impact. No vendor advisory or patch information is currently available.

Successful exploitation could allow an attacker with high privileges and requiring user interaction to execute arbitrary scripts in the context of other users, potentially leading to limited confidentiality and integrity impacts. This could result in session hijacking, defacement, or other malicious actions within the affected Drupal Entity Browser environment. However, no active exploits are known at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should apply strict input validation and sanitization where possible and limit privileges to reduce risk. Monitor Drupal security channels for updates.