CVE-2026-18260 Overview
CVE-2026-18260 affects the Drupal Disable Login Page contributed module. The advisory identifies an improper input validation flaw ([CWE-20]) that can be abused by an authenticated attacker with high privileges when a target user is convinced to interact with a crafted request. Successful exploitation impacts the confidentiality and integrity of the affected Drupal site. The issue is tracked by Drupal advisories SA-2026-091 and SA-2026-110, and applies to Disable Login Page module versions as documented by the vendor.
Critical Impact
Authenticated exploitation of CVE-2026-18260 allows an attacker to compromise site confidentiality and integrity on Drupal installations running the Disable Login Page module.
Affected Products
- Drupal Disable Login Page contributed module (see SA-2026-091)
- Drupal Disable Login Page contributed module (see SA-2026-110)
- Drupal sites with the Disable Login Page module enabled
Discovery Timeline
- 2026-08-25 - CVE-2026-18260 published to the National Vulnerability Database (NVD)
- 2026-08-26 - Last updated in the NVD database
Technical Details for CVE-2026-18260
Vulnerability Analysis
CVE-2026-18260 is classified as an Improper Input Validation weakness ([CWE-20]) in the Drupal Disable Login Page module. The module fails to properly validate input processed during privileged operations. An attacker who already holds high privileges on the Drupal site can craft input that the module accepts and processes without adequate sanitization or constraint checking.
Exploitation is not automatic. It requires user interaction from a victim on the target application, meaning the attacker must combine the flaw with a social engineering step such as a crafted link or form submission. Once triggered, the flaw enables the attacker to influence sensitive data and application state managed by the module.
Root Cause
The root cause is insufficient validation of input handled by the Disable Login Page module. Drupal's contributed module framework relies on individual modules to enforce validation on request data before it reaches privileged code paths. In this module, that validation is either missing or incomplete, allowing malformed or unexpected input to reach logic that trusts it.
Attack Vector
The attack is delivered over the network against a Drupal site running the vulnerable module. The attacker must be authenticated with high privileges and must lure a legitimate user into performing an action, such as clicking a prepared URL. Attack complexity is high because the exploitation chain depends on both prerequisite access and successful user interaction.
No public proof-of-concept exploit is currently listed for this CVE. Refer to the Drupal Security Advisory SA-2026-091 and Drupal Security Advisory SA-2026-110 for module-specific technical details.
Detection Methods for CVE-2026-18260
Indicators of Compromise
- Unexpected changes to Disable Login Page module configuration or associated Drupal settings entities.
- Requests to module endpoints containing malformed parameters or values outside documented ranges.
- High-privileged Drupal accounts issuing administrative actions from unusual IP addresses or user agents.
Detection Strategies
- Review Drupal watchdog and web server logs for administrative requests targeting Disable Login Page routes, correlated with the affected account.
- Compare current module configuration against a known-good baseline to identify unauthorized modifications.
- Alert on privileged Drupal sessions that perform configuration changes shortly after clicking externally sourced links.
Monitoring Recommendations
- Enable and centralize Drupal request logging, including POST bodies for administrative paths, in a SIEM.
- Monitor for privilege changes, module enable/disable events, and edits to login-related configuration.
- Track outbound referrers and cross-origin form submissions targeting authenticated admin sessions.
How to Mitigate CVE-2026-18260
Immediate Actions Required
- Inventory Drupal sites and confirm whether the Disable Login Page module is installed and enabled.
- Apply the fixed release of the Disable Login Page module as directed in SA-2026-091 and SA-2026-110.
- Rotate credentials for any account with elevated Drupal roles that may have been abused.
Patch Information
Drupal has published fixes through its security advisory process. Consult the Drupal Security Advisory SA-2026-091 and Drupal Security Advisory SA-2026-110 for the specific module versions containing the fix and update instructions. Use composer update or Drupal's standard module update workflow to install the patched release, then run drush updatedb and clear caches.
Workarounds
- Disable the Disable Login Page module until the patched version is deployed if it is not business critical.
- Restrict high-privileged Drupal roles to a minimal set of trusted administrators.
- Enforce anti-CSRF protections and require re-authentication for sensitive administrative actions to reduce reliance on the user-interaction step.
# Configuration example
# Update the vulnerable module via Composer and apply database updates
composer update drupal/disable_login_page --with-dependencies
vendor/bin/drush updatedb -y
vendor/bin/drush cache:rebuild
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
