CVE-2026-15086 Overview
CVE-2026-15086 is a medium-severity vulnerability in the Drupal contributed module Raw Formatter [Meta Tag Formatter]. The flaw affects how the module processes meta tag output, exposing confidentiality and integrity of site content to an authenticated attacker holding elevated privileges. The issue is exploitable over the network without user interaction, but requires high attack complexity and existing high-privilege access. Drupal disclosed the vulnerability through its security advisory process. Site operators running the affected contributed module should apply the vendor-published fix and audit privileged accounts.
Critical Impact
A high-privileged authenticated attacker can compromise the confidentiality and integrity of Drupal site data served through the Raw Formatter [Meta Tag Formatter] module.
Affected Products
- Drupal contributed module: Raw Formatter [Meta Tag Formatter]
- All released versions prior to the fixed release published in the Drupal Security Advisory
- Drupal sites where the module is installed and enabled
Discovery Timeline
- 2026-07-10 - CVE-2026-15086 published to the National Vulnerability Database (NVD)
- 2026-07-13 - Last updated in NVD database
Technical Details for CVE-2026-15086
Vulnerability Analysis
The vulnerability resides in the Raw Formatter [Meta Tag Formatter], a contributed Drupal module that renders raw meta tag values within field output. The module fails to enforce sufficient protections during meta tag processing, allowing an authenticated user with high privileges to influence rendered output in ways that impact confidentiality and integrity. The attack vector is network-based, but the high attack complexity and high privilege requirement narrow the pool of viable attackers. No user interaction is required to trigger the flaw. Availability is not affected, which suggests the module continues to serve requests during exploitation.
According to the Exploit Prediction Scoring System, the probability of exploitation within the next 30 days is 0.414%, placing this CVE in the 33rd percentile of scored vulnerabilities. No public proof-of-concept, exploit tooling, or CISA Known Exploited Vulnerabilities listing exists at the time of publication.
Root Cause
The Drupal security advisory attributes the issue to insufficient handling of meta tag field data within the Raw Formatter [Meta Tag Formatter] rendering path. Because the vendor advisory does not publish CWE mapping or code-level detail, defenders should reference the Drupal Security Advisory for authoritative root-cause information.
Attack Vector
An attacker must first obtain an account with high privileges on the target Drupal site. From that position, the attacker submits crafted content that traverses the Raw Formatter [Meta Tag Formatter] rendering path. Successful exploitation lets the attacker read or modify data that should remain protected within the site's meta tag output surface. The vulnerability manifests server-side; no browser interaction is needed from another user to complete the attack. Refer to the vendor advisory for technical specifics on the vulnerable code path.
Detection Methods for CVE-2026-15086
Indicators of Compromise
- Unexpected modifications to meta tag field values on nodes or entities rendered through the affected formatter
- Privileged account activity involving edits to content types that use Raw Formatter [Meta Tag Formatter]
- Anomalous HTTP responses containing unexpected meta tag payloads from Drupal endpoints
Detection Strategies
- Review Drupal watchdog and dblog entries for edits by administrative accounts touching meta tag fields on affected entities
- Compare the installed module version against the fixed release listed in the Drupal Security Advisory
- Enable and review content revision history to identify unauthorized changes to meta tag data
Monitoring Recommendations
- Alert on privileged role assignments and administrator logins to Drupal sites hosting the module
- Forward Drupal application logs to a centralized log platform for correlation with web server access logs
- Track outbound traffic and rendered HTML for unexpected meta tag content on production pages
How to Mitigate CVE-2026-15086
Immediate Actions Required
- Identify all Drupal sites where the Raw Formatter [Meta Tag Formatter] contributed module is installed and enabled
- Apply the fixed release referenced in the Drupal Security Advisory
- Audit accounts holding administrative or content-management roles and revoke unnecessary privileges
- Rotate credentials for privileged accounts that may have been used to reach the affected functionality
Patch Information
Drupal has published a fixed release of the Raw Formatter [Meta Tag Formatter] module through the advisory SA-CONTRIB-2026-077. Site administrators should update using composer update or the Drupal update manager and clear the site cache after deployment. Confirm the running module version matches the fixed release listed in the advisory.
Workarounds
- Disable the Raw Formatter [Meta Tag Formatter] module until the patched release can be deployed
- Restrict high-privilege roles to a minimal set of trusted administrators
- Remove use of the affected formatter from display modes on content types that expose meta tag fields
# Update the contributed module using Composer, then apply database updates
composer update drupal/metatag_raw_formatter --with-dependencies
drush updatedb
drush cache:rebuild
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
