Medium [CVE-2026-61910] Mailbox/set let sharee change special-use role on shared mailboxes
This medium-severity Red Hat Linux advisory covers CVE-2026-61910 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
A flaw was found in cyrus-imapd. An authenticated user with specific permissions on another user's mailbox could alter its special-use annotation.
This manipulation might allow the user to change the shared mailbox's role, potentially causing unintended mail content to be written to it and shared beyond the original intent. Red Hat severity: Moderate — CVSS 4.2 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N).
Weakness: CWE-863. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: cyrus-imapd.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- To reduce exposure, administrators should review and restrict `maySetKeywords` permissions on shared mailboxes within cyrus-imapd deployments. Ensuring that only authorized and trusted users possess these specific permissions will limit the ability to alter special-use annotations and prevent unintended mail routing.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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