A security flaw has been identified in the Drupal Flag module, a popular tool that allows website administrators to add “flags” to various content types like posts or comments. This vulnerability, known as Cross-Site Scripting (XSS), could potentially allow attackers to inject malicious code into web pages. If exploited, an attacker could steal sensitive information, hijack user sessions, or deface the website. This issue affects specific versions of the Flag module for Drupal 7.
CVE Details
- Product: Drupal Flag
- Published: January 14, 2026
- Severity: Medium
- Status: Analyzed
Affected Products
The vulnerability impacts the Flag module for Drupal 7. Specifically, users running versions from 7.x-3.0 through 7.x-3.9 are at risk. If your Drupal 7 site uses the Flag module within this version range, it’s crucial to take action.
Current Status
This vulnerability is currently in an “Analyzed” state, meaning its details and impact have been thoroughly reviewed and understood by security researchers.
Severity Level
Rated as “Medium” severity with a CVSS score of 5.4, this XSS vulnerability indicates a moderate risk. While it’s not the highest level of threat, it still poses a significant concern. Successful exploitation typically requires an attacker to have certain permissions on the website, such as the ability to create or edit comments or content with a filtered text format. This mitigation somewhat reduces the immediate widespread risk but doesn’t eliminate the need for patching.
Possible Solutions
The good news is that a fix is available! To protect your Drupal 7 website from this Cross-Site Scripting vulnerability, you must upgrade your Flag module. The recommended solution is to upgrade to Flag 7.x-3.10 or any newer version. This update addresses the underlying flaw by ensuring that flag links are properly verified before actions are performed, and responses are validated, preventing malicious HTML injection.
Always remember to back up your website before performing any updates or changes. For a deeper dive into XSS, consider reading our blog post on Understanding Cross-Site Scripting Attacks.
References
https://d7es.tag1.com/security-advisories/flag-moderately-critical-cross-site-scripting-backdrop-sa-contrib-2025-011
https://www.herodevs.com/vulnerability-directory/cve-2025-14556
