CVE-2026-61910
published 2026-09-09CVE-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…
PriorityP427medium5CVSS 3.1
AVNACLPRLUINSCCLINAN
EPSS
0.19%
8.6th percentile
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.)
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| cyrus | imap | < 3.8.8 | 3.8.8 |
| cyrus | imap | >= 3.11.0 < 3.12.4 | 3.12.4 |
| cyrus | imap | >= 3.9.0 < 3.10.4 | 3.10.4 |
| cyrusimap | cyrus_imap | < 3.8.8 | 3.8.8 |
| cyrusimap | cyrus_imap | >= 3.11.0 < 3.12.4 | 3.12.4 |
| cyrusimap | cyrus_imap | >= 3.9.0 < 3.10.4 | 3.10.4 |
| debian | cyrus-imapd | — | — |
CVSS provenance
nvdv3.15.0MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
vendor_redhat3.5LOW
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GHSA
An issue was discovered in Cyrus IMAP before 3.12.4.
ghsa_unreviewed·2026-09-09
CVE-2026-61910 [LOW] CWE-863 An issue was discovered in Cyrus IMAP before 3.12.4.
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.)
VulDB
Cyrus IMAP up to 3.8.7/3.10.3/3.12.3 Mailbox Mailbox/set privileges management (EUVD-2026-75130)
vuldb·2026-09-09·CVSS 3.5
CVE-2026-61910 [LOW] Cyrus IMAP up to 3.8.7/3.10.3/3.12.3 Mailbox Mailbox/set privileges management (EUVD-2026-75130)
A vulnerability described as critical has been identified in Cyrus IMAP up to 3.8.7/3.10.3/3.12.3. Impacted is the function Mailbox/set of the component Mailbox. The manipulation results in improper privilege management.
This vulnerability was named CVE-2026-61910. The attack may be performed from remote. There is no available exploit.
Upgrading the affected component is recommended.
Red Hat
cyrus-imapd: cyrus-imapd: Mailbox/set let sharee change special-use role on shared mailboxes
vendor_redhat·2026-09-10·CVSS 3.5
CVE-2026-61910 [LOW] CWE-863 cyrus-imapd: cyrus-imapd: Mailbox/set let sharee change special-use role on shared mailboxes
cyrus-imapd: cyrus-imapd: Mailbox/set let sharee change special-use role on shared mailboxes
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.)
A flaw was found in cyrus-imapd. An authenticated user with speci
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-61910 cyrus-imapd: cyrus-imapd: Mailbox/set let sharee change special-use role on shared mailboxes [fedora-all]
bugzilla·2026-09-10·CVSS 3.5
CVE-2026-61910 [LOW] CVE-2026-61910 cyrus-imapd: cyrus-imapd: Mailbox/set let sharee change special-use role on shared mailboxes [fedora-all]
CVE-2026-61910 cyrus-imapd: cyrus-imapd: Mailbox/set let sharee change special-use role on shared mailboxes [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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
Bugzilla
CVE-2026-61910 cyrus-imapd: cyrus-imapd: Mailbox/set let sharee change special-use role on shared mailboxes
bugzilla·2026-08-31·CVSS 3.5
CVE-2026-61910 [LOW] CVE-2026-61910 cyrus-imapd: cyrus-imapd: Mailbox/set let sharee change special-use role on shared mailboxes
CVE-2026-61910 cyrus-imapd: cyrus-imapd: Mailbox/set let sharee change 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.
2026-09-09
Published