CVE-2026-61907

MEDIUM

4.3

CVSS Score

Published: September 9, 2026 at 12:00 AM UTC

Updated: September 14, 2026 at 04:17 PM UTC

2 products affected across 1 vendorCyrusimapCyrus IMAP

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Severity

MEDIUM4.3

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

An issue was discovered in Cyrus IMAP before 3.12.4. JMAP snooze bypasses the destination-mailbox ACL. An authenticated user with insert permissions on another user's snoozed mailbox could cause insertion of mail to that user's inbox, or any other of their mailboxes whose id was known to the user, despite having no insert permissions to the target mailbox.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cyrusimap · Cyrusimap

95%

v < 3.8.83.11.0 ≤ v < 3.12.43.9.0 ≤ v < 3.10.4

Affected range stops below 3.10.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.12.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.8.8, so it looks safe — our inference, not a vendor statement

Cyrus IMAP · Cyrusimap

60%

v < 3.8.83.11.0 ≤ v < 3.12.43.9.0 ≤ v < 3.10.43.11.0 3.9.0

Affected range stops below 3.10.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.12.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 3.8.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

Source: cverecord

https://cyrusimap.org

Source: cverecord

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.12/x/3.12.4.html

Source: cverecord

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.10/x/3.10.4.html

Source: cverecord

https://www.cyrusimap.org/3.12/imap/download/release-notes/3.8/x/3.8.8.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMmitre

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-863

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