RCE in Open-Xchange Appsuite Backend
CVE-2023-26436
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.013 (68.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 68.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000
Affected products
- Open-Xchange Appsuite Backend — versions 7.10.6
- Ox Software Gmbh App Suite — versions 0
Weakness classification (CWE)
References
- software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release… (release-notes, Release Notes)
- documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-… (vendor-advisory)
- seclists.org/fulldisclosure/2023/Jun/8 (Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/173083/OX-App-Suite-SSRF-Resource-Consumption-Com… (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-26436?
- CVE-2023-26436 is a high-severity vulnerability in Open-Xchange Appsuite Backend, classified under Code Injection. CVSS score: 7.1/10. Published 2023-06-20.
- How severe is CVE-2023-26436?
- High severity. CVSS v3 base score is 7.1 out of 10.