Vulnerability · Published Oct 16, 2026 · Assigned by VulnCheck
CVE-2026-111620O2OA through 10.0.2-ce Cross-Work Attachment Read via Attachment Download Endpoint
Medium 5.3
In plain English
A medium-severity authorization bypass via user-controlled key in O2OA from O2OA. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
References
- https://hackmd.io/@hieuPenguinnn/o2oa-processplatform-attachment-download-work-cross-work-idor third-party-advisory
- https://github.com/o2oa/o2oa/blob/10.0.2-ce/o2server/x_processplatform_assemble_surface/src/main/java/com/x/processplatform/assemble/surface/jaxrs/attachment/ActionDownloadWithWork.java#L44-L95 technical-description
- https://github.com/o2oa/o2oa/blob/10.0.2-ce/o2server/x_processplatform_assemble_surface/src/main/java/com/x/processplatform/assemble/surface/jaxrs/attachment/ActionDownloadWithWorkStream.java#L45-L64 technical-description
- https://github.com/o2oa/o2oa product
- VulnCheck Advisory: O2OA through 10.0.2-ce Cross-Work Attachment Read via Attachment Download Endpoint third-party-advisory