CVE-2023-26433 (open-xchange_appsuite_backend)

When adding an external mail account, processing of IMAP "capabilities" responses are not limited to plausible sizes. Attacker with access to a rogue IMAP service could trigger requests that lead to excessive resource usage and eventually service unavailability. We now limit accepted IMAP server response to reasonable length/size. No publicly available exploits are known.

access account capabilities cve exploits external imap length limit mail requests response rogue server service size trigger