What’s Vulnerable › Vulnerabilities

CVE-2023-26455

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-02 · updated 2026-06-17
• Weakness: CWE-287

Description

RMI was not requiring authentication when calling ChronosRMIService:setEventOrganizer. Attackers with local or adjacent network access could abuse the RMI service to modify calendar items using RMI. RMI access is restricted to localhost by default. The interface has been updated to require authenticated requests. No publicly available exploits are known.

Affected products

• Open-Xchange Appsuite: before 7.10.6; 7.10.6, 7.10.6-patch_release_6069, 7.10.6-patch_release_6073, 7.10.6-patch_release_6080, 7.10.6-patch_release_6085, 7.10.6-patch_release_6093 (+36) — fixed in 7.10.6

How to fix

Upgrade to a fixed version: Open-Xchange Appsuite 7.10.6. Check the vendor advisory for mitigations.

References

• https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0004.json
• https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6243_7.10.6_2023-08-01.pdf
• https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0004.json
• https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6243_7.10.6_2023-08-01.pdf

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