Incorrect authorization in cyrusimap Cyrus IMAP
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Partial Red Hat: 5 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-863.
Summary
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.)
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| cyrusimap | Cyrus IMAP | before 3.8.8; 3.9.0 to before 3.10.4; 3.11.0 to before 3.12.4 | 3.8.8, 3.10.4, 3.12.4 | Patch available | CNA |
- Cyrus IMAP Vendorcyrusimap Affected before 3.8.8; 3.9.0 to before 3.10.4; 3.11.0 to before 3.12.4 Fixed in 3.8.8, 3.10.4, 3.12.4 Patch available CNA
Remediation
- Fix · CNA Cyrus IMAP (cyrusimap) Fixed in 3.8.8, 3.10.4, 3.12.4
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
cyrusimap Cyrus IMAP 3.10.4, 3.12.4, 3.8.8
6 records Highest priority Priority LOW 6 LOW
Other records, highest priority first
- TI-2026-44296 Double free in cyrusimap Cyrus IMAPPriority LOW 31
- TI-2026-44292 Out-of-bounds read in cyrusimap Cyrus IMAPPriority LOW 28
- TI-2026-44295 An issue was discovered in Cyrus IMAP before 3.12.4.Priority LOW 19
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-61910
- 2026-10-03 Alias added: GHSA-4rv6-f2p6-rhx5
References
More cyrusimap vulnerabilities
- TI-2002-01271 Multiple buffer overflows in Cyrus SASL library 2.1.9 and earlier allow remote attackers… CVSS 3.1CRITICAL 9.8
- TI-2022-08283 In Cyrus SASL 2.1.17 through 2.1.27 before 2.1.28, plugins/sql.c does not escape the… CVSS 3.1HIGH 8.8
- TI-2019-14353 cyrus-sasl (aka Cyrus SASL) 2.1.27 has an out-of-bounds write leading to unauthenticated… CVSS 3.1HIGH 7.5
- TI-2026-44296 Double free in cyrusimap Cyrus IMAP CVSS 3.1HIGH 7.1
- TI-2017-09510 Cyrus IMAP before 3.0.3 allows remote authenticated users to write to arbitrary files via… CVSS 3.0MEDIUM 6.5
- TI-2024-22515 Cyrus IMAP before 3.8.3 and 3.10.x before 3.10.0-rc1 allows authenticated attackers to… CVSS 3.1MEDIUM 6.5
Sources
- CVE-2026-61910 · CVE Program
- CVE-2026-61910 · NVD
- FIRST EPSS
- GHSA-4rv6-f2p6-rhx5 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-61910 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences