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 mailbox to perform the archived, snoozed, or other role, which might cause mail mail to be written to the shared mailbox, sharing more content than intended. (This is likely to be an unusual situation, made more unusual because if the target already has an non-shared mailbox with that role, role duplication suppression will prevent the update.)

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21929-1 advisory.

    Changes in cyrus-imapd:

    Update to 3.8.8 (bugfix release):

    - CVE-2026-61907: JMAP snooze bypasses destination-mailbox ACL (bsc#1279908)
    - CVE-2026-61908: JMAP email-header blob ID out-of-bounds index (bsc#1279975)
    - CVE-2026-61909: CalDAV/CardDAV multiget bypasses per-href ACL (bsc#1279976)
    - CVE-2026-61910: Mailbox/set let sharee change special-use role on shared mailboxes (bsc#1279977)
    - CVE-2026-61911: Sieve mailbox existence oracle (bsc#1279978)
    - CVE-2026-61915: VPATCH BYPARAM double-free (bsc#1279979)

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-3bf3e31ef4 advisory.

    - New version 3.12.4 (rhbz#2500822)



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-97a7ec5786 advisory.

    - New version 3.10.4 (rhbz#2500822)



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-740bc1c6fa advisory.

    - New version 3.12.4 (rhbz#2500822)



Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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 mailbox to perform the     archived, snoozed, or other role, which might cause mail mail to be written to the shared mailbox, sharing     more content than intended. (This is likely to be an unusual situation, made more unusual because if the     target already has an non-shared mailbox with that role, role duplication suppression will prevent the     update.) (CVE-2026-61910)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
350143	openSUSE 16: cyradm / cyrus-imapd / cyrus-imapd-devel / cyrus-imapd-snmp / etc (openSUSE-SU-2026:21929-1)	Nessus	SuSE Local Security Checks	Local	high
349129	Fedora 45 : cyrus-imapd (2026-3bf3e31ef4)	Nessus	Fedora Local Security Checks	Local	high
349123	Fedora 43 : cyrus-imapd (2026-97a7ec5786)	Nessus	Fedora Local Security Checks	Local	high
349116	Fedora 44 : cyrus-imapd (2026-740bc1c6fa)	Nessus	Fedora Local Security Checks	Local	high
344531	Linux Distros Unpatched Vulnerability : CVE-2026-61910	Nessus	Misc.	Local	medium

Detections

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CVE-2026-61910

medium

Tenable Plugins

high

high

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medium