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CVE-2023-26436

7.1 · HIGH

Attackers with access to the "documentconverterws" API were able to inject serialized Java objects, that were not properly checked during deserialization.

Published Jun 20, 2023CWE-94EPSS 1.25%

Overview

CVE-2023-26436 is a high-severity vulnerability. It was published on June 20, 2023 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/173083/OX-App-Suite-SSRF-Resource-Consumption-Command-Injection.htmlRefseclists.org/fulldisclosure/2023/Jun/8Refdocumentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0002.jsonRefsoftware.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6219_7.10.6_2023-03-20.pdfRefpacketstormsecurity.com/files/173083/OX-App-Suite-SSRF-Resource-Consumption-Command-Injection.htmlRefseclists.org/fulldisclosure/2023/Jun/8Refdocumentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0002.jsonRefsoftware.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6219_7.10.6_2023-03-20.pdf

How CyberStrike helps

Frequently asked questions

What is CVE-2023-26436?

CVE-2023-26436 is a high-severity vulnerability. It was published on June 20, 2023 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2023-26436?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-26436?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-26436?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-26436 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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