Auth bypass in O2oa
CVE-2026-111620
O2OA through 10.0.2-ce contains an authorization bypass vulnerability in x_processplatform_assemble_surface that allows authenticated users to download attachments from other works. ActionDownloadWithWork and ActionDownloadWithWorkStream never verify that the requested attachment id belongs to the referenced work or draft, so any visitable work or owned draft can be supplied. Attackers who know an attachment UUID can request it through jaxrs/attachment/download/{id}/work/{workId} to read documents attached to other users' processes.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/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
- hackmd.io/@hieuPenguinnn/o2oa-processplatform-attachment-download-work-cross-wo… (third-party-advisory)
- github.com/o2oa/o2oa/blob/10.0.2-ce/o2server/x_processplatform_assemble_surface… (technical-description)
- github.com/o2oa/o2oa/blob/10.0.2-ce/o2server/x_processplatform_assemble_surface… (technical-description)
- github.com/o2oa/o2oa (product)
- www.vulncheck.com/advisories/o2oa-through-10.0.2-ce-cross-work-attachment-read-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111620?
- CVE-2026-111620 is a medium-severity vulnerability in O2oa, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.3/10. Published 2026-10-16.
- How severe is CVE-2026-111620?
- Medium severity. CVSS v3 base score is 5.3 out of 10.