---
id: CVE-2026-111620
title: >-
  O2OA through 10.0.2-ce Cross-Work Attachment Read via Attachment Download
  Endpoint
summary: >-
  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…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-639
vendor: O2OA
product: O2OA
affected:
  - O2OA <= 10.0.2-ce
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:38:57.366Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111620'
references:
  - url: >-
      https://hackmd.io/@hieuPenguinnn/o2oa-processplatform-attachment-download-work-cross-work-idor
  - url: >-
      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
  - url: >-
      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
  - url: 'https://github.com/o2oa/o2oa'
  - url: >-
      https://www.vulncheck.com/advisories/o2oa-through-10.0.2-ce-cross-work-attachment-read-via-attachment-download-endpoint
    label: >-
      VulnCheck Advisory: O2OA through 10.0.2-ce Cross-Work Attachment Read via
      Attachment Download Endpoint
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.691Z'
---

## Overview

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

- `O2OA <= 10.0.2-ce`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.