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CVE-2026-61910

Cyrus IMAP · Vulnerability

CVSS 3.1 3.5 LOWCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-61910

Published

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.)

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-61910

Published

Cyrus IMAP

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "product": "Cyrus IMAP",
                    "vendor": "cyrusimap",
                    "versions": [
                        {
                            "lessThan": "3.8.8",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        },
                        {
                            "lessThan": "3.10.4",
                            "status": "affected",
                            "version": "3.9.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThan": "3.12.4",
                            "status": "affected",
                            "version": "3.11.0",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON