Auth bypass in Camunda 7
CVE-2026-109431
Camunda 7.24.0 before 7.24.14 and 7.23.0 before 7.23.17 contains a missing authorization check vulnerability in engine-rest task sub-resources that allows authenticated attackers with no permission grants to access task comments and attachments by calling singular read and delete endpoints that lack the authorization-filtered checks enforced on their corresponding list endpoints. Attackers can exploit TaskAttachmentResourceImpl and TaskCommentResourceImpl methods such as getAttachment, getAttachmentData, deleteAttachment, and getComment using only a known object ID to read, download, or permanently delete task attachments and comments.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- codeant.ai/security-research/camunda-task-attachment-authorization-cve-2026-109… (technical-description, exploit)
- docs.camunda.org/enterprise/download/ (product, patch)
- www.vulncheck.com/advisories/camunda-missing-authorization-in-task-sub-resources (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109431?
- CVE-2026-109431 is a high-severity vulnerability in Camunda 7, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 8.1/10. Published 2026-10-19.
- How severe is CVE-2026-109431?
- High severity. CVSS v3 base score is 8.1 out of 10.