CVE-2026-113668 apostrophecms CVE debrief

Who should care

Defenders of systems using ApostropheCMS, especially those responsible for security and patch management, should assess the exposure of their systems to this vulnerability and prioritize remediation.

Why it matters

This vulnerability allows unauthenticated access to sensitive information about documents and their locales in ApostropheCMS, potentially leading to reconnaissance and exploitation.

• Unauthenticated document existence disclosure
• Unauthenticated locale metadata disclosure
• Potential for reconnaissance and exploitation
• Verification of document existence and locale metadata

Technical summary

The REST route `GET /api/v1/<piece-type>/:_id/locales` in ApostropheCMS does not apply the `publicApiCheckAsync` gate, allowing unauthenticated callers to query for document existence and locale metadata. This vulnerability allows unauthenticated access to sensitive information about documents and their locales in ApostropheCMS, potentially leading to reconnaissance and exploitation. Defenders should prioritize verifying exposure and assessing the impact of this vulnerability on their systems, especially those using ApostropheCMS versions prior to 4.33.0.

Defensive priority

Defenders should prioritize verifying exposure and assessing the impact of this vulnerability on their systems, especially those using ApostropheCMS versions prior to 4.33.0.

Recommended defensive actions

• Verify if the system uses affected versions of ApostropheCMS and prioritize upgrading to version 4.33.0 or later.
• Restrict access to the affected endpoints to authenticated users only.
• Monitor for unauthorized access attempts to the affected endpoints.
• Implement additional logging and monitoring to detect potential 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.

Evidence notes

The vulnerability was confirmed at ApostropheCMS version 4.32.2 and is fixed in version 4.33.0. The affected endpoints are `GET /api/v1/<piece-type>/:_id/locales` and `GET /api/v1/@apostrophecms/page/:_id/locales`.

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.