PatchTheCVEopen-xchange vulnerabilities
Recent CVEs affecting open-xchange products. 2 tracked.
open-xchange has 2 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 2. Most recent: 2026-03-27. Highest priority: CVE-2026-27859 (score 32/100).
- CVE-2026-27859 MEDIUM 5.3 UPGRADE UPGRADE A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU
- CVE-2026-27860 LOW 3.7 UPGRADE UPGRADE If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authenticati
FAQ
How do I fix open-xchange vulnerabilities?
Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.
Is open-xchange being exploited right now?
None of the tracked open-xchange CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.
Which open-xchange CVE should I patch first?
CVE-2026-27859 currently ranks highest (32/100): A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU.