CVE-2026-61907

An issue was discovered in Cyrus IMAP before 3.12.4. JMAP snooze bypasses the destination-mailbox ACL. An authenticated user with insert permissions on another user's snoozed mailbox could cause insertion of mail to that user's inbox, or any other of their mailboxes whose id was known to the user...

CVE-2026-61907

This vulnerability affects Cyrus IMAP prior to version 3.12.4 , where the JMAP snooze operation bypasses the destination-mailbox ACL . An authenticated user who holds insert permissions on another user's snoozed mailbox can force mail insertion into that user's inbox or any other mailbox whose ID...

CVE-2026-61910

Cyrus IMAP before 3.12.4 is affected by a flaw in the Mailbox/set command, where an authenticated user holding the maySetKeywords privilege on another user's mailbox can alter its special-use annotation . This allows the sharee to reassign the shared mailbox to roles such as archived or snoozed ,...

CVE-2026-61909

Cyrus IMAP before 3.12.4 (backported to 3.10.4 and 3.8.8) contains an ACL bypass in its CalDAV/CardDAV multiget functionality. An authenticated DAV user who holds some shared access to another user's calendar or address book can read unshared events or contacts by including target hrefs in a cale...

PT-2026-89142

Name of the Vulnerable Software and Affected Versions Cyrus IMAP versions prior to 3.12.4 Description A double-free issue exists in the VPATCH BYPARAM functionality. An authenticated calendar user can cause a Cyrus CalDAV worker to crash by sending a PATCH request containing...

PT-2026-89140

Name of the Vulnerable Software and Affected Versions Cyrus IMAP versions prior to 3.12.4 Description An issue exists where the Mailbox/set function allows a sharee to modify a special-use role on shared mailboxes. An authenticated user possessing the maySetKeywords permission on another user's...

CVE-2026-61910

An issue was discovered in Cyrus IMAP before 3.12.4. Mailbox/set let a sharee change a special-use role on shared mailboxes. An authenticated user with maySetKeywords on another user's mailbox could change that mailbox's specialuse annotation. This could allow the sharee to change the shared...

CVE-2026-61910

An issue was discovered in Cyrus IMAP before 3.12.4. Mailbox/set let a sharee change a special-use role on shared mailboxes. An authenticated user with maySetKeywords on another user's mailbox could change that mailbox's specialuse annotation. This could allow the sharee to change the shared...

CVE-2026-61909

An issue was discovered in Cyrus IMAP before 3.12.4. CalDAV/CardDAV multiget bypasses a per-href ACL. An authenticated DAV user with some shared access to another user's calendar or address book could read even unshared events or contacts by including the target hrefs in a calendar-multiget or...

EUVD-2026-75132

An issue was discovered in Cyrus IMAP before 3.12.4. CalDAV/CardDAV multiget bypasses a per-href ACL. An authenticated DAV user with some shared access to another user's calendar or address book could read even unshared events or contacts by including the target hrefs in a calendar-multiget or...

CVE-2026-61911

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired...

EUVD-2026-75129

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired...

PT-2026-89126

Name of the Vulnerable Software and Affected Versions Cyrus IMAP versions prior to 3.12.4 Description A flaw exists where JMAP snooze bypasses the destination-mailbox Access Control List ACL. An authenticated user who possesses insert permissions on another user's snoozed mailbox can insert mail...

EUVD-2026-75134

An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H-, which could read past the end of the internal blobheaders array during download, exposing...

CVE-2026-61915

Cyrus IMAP before 3.12.4 is affected by a VPATCH BYPARAM double-free in the CalDAV worker. An authenticated calendar user can trigger a crash by sending a PATCH request with PATCH-ACTION="BYPARAM@..." against a resource that has two or more properties of the matched kind, causing the memory holdi...

PT-2026-89136

Name of the Vulnerable Software and Affected Versions Cyrus IMAP versions prior to 3.12.4 Description An issue exists where CalDAV and CardDAV multiget operations bypass per-href Access Control Lists ACL. An authenticated DAV user who has partial shared access to another user's address book or...

PT-2026-89141

Name of the Vulnerable Software and Affected Versions Cyrus IMAP versions prior to 3.12.4 Description A Sieve mailbox existence oracle exists where an authenticated user can install a Sieve script to determine if another user's private mailbox exists or read the value of shared mailbox annotation...

CVE-2026-61911

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired...

CVE-2026-61911

Cyrus IMAP before 3.12.4 is affected by a Sieve mailbox existence oracle . An authenticated user can install a Sieve script that probes whether another user's private mailbox exists, or read the value of shared mailbox annotations , by observing which fileinto branch fires during LMTP delivery. T...

CVE-2026-61908

An out-of-bounds read vulnerability in Cyrus IMAP before 3.12.4 (also fixed in 3.10.4 and 3.8.8) allows an authenticated user to download a crafted JMAP email-header blob ID of the form H-, which reads past the end of the internal blob_headers array, potentially exposing adjacent heap memory . NV...