CVE-2026-61910: CWE-863 Incorrect Authorization in cyrusimap Cyrus IMAP
CVE-2026-61910 is an authorization vulnerability in Cyrus IMAP before version 3.12.4. It allows an authenticated user with maySetKeywords permission on another user's mailbox to change the mailbox's special-use annotation. This could enable the sharee to assign special roles like archived or snoozed to the shared mailbox, potentially causing mail to be written there and exposing more content than intended. The issue is mitigated by role duplication suppression if the target already has a non-shared mailbox with that role.
AI Analysis
Technical Summary
CVE-2026-61910 is an incorrect authorization vulnerability (CWE-863) in Cyrus IMAP versions prior to 3.12.4. The flaw allows a sharee with maySetKeywords permission on a mailbox to change special-use roles (such as archived or snoozed) on shared mailboxes. This could lead to unintended mail routing or content exposure by altering mailbox roles. The vulnerability requires authentication and low privileges but has a high attack complexity. Role duplication suppression reduces the likelihood of impact if the target mailbox already has the role assigned in a non-shared context.
Potential Impact
An authenticated user with limited privileges can modify special-use annotations on shared mailboxes, potentially causing mail to be delivered to shared mailboxes with altered roles. This may result in unintended sharing of mailbox content. The confidentiality impact is low, and there is no impact on integrity or availability. The scenario is considered unusual and mitigated by role duplication suppression.
Mitigation Recommendations
No official patch or fix is currently confirmed. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict maySetKeywords permissions carefully and monitor mailbox sharing configurations to limit potential misuse.
CVE-2026-61910: CWE-863 Incorrect Authorization in cyrusimap Cyrus IMAP
Description
CVE-2026-61910 is an authorization vulnerability in Cyrus IMAP before version 3.12.4. It allows an authenticated user with maySetKeywords permission on another user's mailbox to change the mailbox's special-use annotation. This could enable the sharee to assign special roles like archived or snoozed to the shared mailbox, potentially causing mail to be written there and exposing more content than intended. The issue is mitigated by role duplication suppression if the target already has a non-shared mailbox with that role.
CVSS v3.1
Score 3.5low
Affected software
pkg:github/cyrusimap/cyrus-imapRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-61910 is an incorrect authorization vulnerability (CWE-863) in Cyrus IMAP versions prior to 3.12.4. The flaw allows a sharee with maySetKeywords permission on a mailbox to change special-use roles (such as archived or snoozed) on shared mailboxes. This could lead to unintended mail routing or content exposure by altering mailbox roles. The vulnerability requires authentication and low privileges but has a high attack complexity. Role duplication suppression reduces the likelihood of impact if the target mailbox already has the role assigned in a non-shared context.
Potential Impact
An authenticated user with limited privileges can modify special-use annotations on shared mailboxes, potentially causing mail to be delivered to shared mailboxes with altered roles. This may result in unintended sharing of mailbox content. The confidentiality impact is low, and there is no impact on integrity or availability. The scenario is considered unusual and mitigated by role duplication suppression.
Mitigation Recommendations
No official patch or fix is currently confirmed. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict maySetKeywords permissions carefully and monitor mailbox sharing configurations to limit potential misuse.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-07-13T00:00:00.000Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6aa1bca9acd9273b49cd3c6b
Added to database: 09/09/2026, 20:08:09 UTC
Last enriched: 09/09/2026, 20:23:12 UTC
Last updated: 09/09/2026, 22:11:47 UTC
Views: 6
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.