CVE-2026-107262 Drupal CVE debrief

Who should care

Defenders responsible for Drupal installations using the Advanced Filesystem module, specifically the Backup submodule, should assess the exposure of authenticated users to potential CSRF attacks and prioritize verification and remediation efforts.

Why it matters

The Advanced Filesystem: Backup submodule's CSRF vulnerability requires defenders to verify module enablement, assess user exposure, and prioritize remediation to prevent potential disruptions and security risks.

• Potential for authenticated users to be tricked into performing unintended actions.
• Possible disruption of file storage management and maintenance tasks.
• Need for verification of module enablement and user exposure.
• Priority for updating to version 1.0.28 or later of the Advanced Filesystem module.

Technical summary

The Advanced Filesystem: Backup submodule in Drupal's Advanced File System does not sufficiently validate certain requests, potentially allowing an attacker to trick an authenticated user into performing unintended actions through a Cross-Site Request Forgery (CSRF) vulnerability. The vulnerability is mitigated by the fact that the `advanced_filesystem_backup` module must be enabled. Defenders should prioritize verifying if the Advanced Filesystem module, specifically the Backup submodule, is enabled and assess the exposure of authenticated users to potential CSRF attacks. The vulnerability is confirmed in versions of the Advanced Filesystem module prior to 1.0.28.

Defensive priority

Defenders should prioritize verifying if the Advanced Filesystem module, specifically the Backup submodule, is enabled and assess the exposure of authenticated users to potential CSRF attacks.

Recommended defensive actions

• Verify if the Advanced Filesystem module, specifically the Backup submodule, is enabled.
• Assess the exposure of authenticated users to potential CSRF attacks.
• Consider updating to version 1.0.28 or later of the Advanced Filesystem module.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The vulnerability is confirmed in versions of the Advanced Filesystem module prior to 1.0.28. Official sources include the CVE Program record, NVD vulnerability detail, and Drupal's security advisory.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.