CVE-2026-113666 apostrophecms CVE debrief

Who should care

Defenders responsible for ApostropheCMS deployments using @apostrophecms/db-connect should assess exposure and apply patches or mitigations to prevent exploitation. This includes reviewing system configurations, monitoring for suspicious activity, and ensuring that patches are applied in a timely manner. Security teams and operators should prioritize verifying exposure and taking corrective action to prevent potential denial-of-service attacks.

Why it matters

A low-privileged authenticated user can cause a process-wide denial of service in @apostrophecms/db-connect by sending a malicious request that deletes a shared runtime method. Defenders should prioritize verifying exposure and applying patches or mitigations to prevent exploitation.

• Denial of service for all tenants and users until the process is restarted
• Potential for persistent exploitation with a single request

Technical summary

The @apostrophecms/db-connect package is vulnerable to an authenticated projection-exclusion prototype-member deletion attack, which can cause a process-wide denial of service. The vulnerability affects SQLite and PostgreSQL adapters, allowing a low-privileged authenticated user to delete a shared runtime method. This deletion breaks request handling for every tenant and user until the process is restarted. The attack involves sending a piece-type REST GET request with a malicious projection query builder containing an exclusion key.

Defensive priority

Defenders should prioritize verifying exposure and applying patches or mitigations to prevent exploitation.

Recommended defensive actions

• Verify exposure by checking if @apostrophecms/db-connect is used in the environment
• Apply patches or mitigations to prevent exploitation
• Monitor for suspicious requests that could indicate exploitation attempts
• 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 source corpus provides details on the vulnerability, including the affected packages and versions. The CVE record was published on 2026-10-20T18:03:50.000Z. Defenders should verify exposure by checking if @apostrophecms/db-connect is used in the environment and apply patches or mitigations to prevent exploitation. Evidence is limited to public sources and may not be comprehensive.

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.