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    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 during LMTP delivery.

    Published:Sep 9, 2026
    Last Modified:Sep 10, 2026
    EPS:Sep 9, 2026
    EPSS Score:0.00217
    CVSS Score:4.3

    Affected Products

    Vendor
    Cyrusimap
    Product
    Cyrus Imap

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-170 Web Application Fingerprinting
    CAPEC-694 System Location Discovery

    Related CVEs

    CVE-2026-61910 (CVSS 3.5) — An issue was discovered in Cyrus IMAP before 3.12.4. Mailbox/set let a sharee change a special-use role on sha…
    CVE-2026-61907 (CVSS 4.3) — An issue was discovered in Cyrus IMAP before 3.12.4. JMAP snooze bypasses the destination-mailbox ACL. An auth…
    CVE-2026-61909 (CVSS 3.5) — An issue was discovered in Cyrus IMAP before 3.12.4. CalDAV/CardDAV multiget bypasses a per-href ACL. An authe…
    CVE-2026-61908 (CVSS 3.1) — An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bound…
    CVE-2026-61915 (CVSS 4.2) — An issue was discovered in Cyrus IMAP before 3.12.4. There is a VPATCH BYPARAM double-free. An authenticated c…
    CVE-2026-47087 (CVSS 3.5) — An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. URLAUTH does not honor revoked authorizer…
    CVE-2026-47088 (CVSS 3.1) — An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is heap exposure in nested MIME com…
    CVE-2026-47086 (CVSS 3.5) — An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. GENURLAUTH-issued tokens can bypass ACLs.…
    CVE-2026-47089 (CVSS 4.3) — An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. LISTRIGHTS os not limited to users with a…
    CVE-2026-47081 (CVSS 3.1) — An issue was discovered in cyrus-imapd in Cyrus IMAP through 3.12.2. There is an XAPPLEPUSHSERVICE folder exis…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-61911 — Cyrusimap (Medium 4.3) | CVE-DB