Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-61907

Quick assessment

Affected
cyrusimap Cyrus IMAP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Cyrus IMAP 3.12.4 之前的版本中，发现了一个安全问题：JMAP 的“snooze”（延迟/挂起）功能会绕过目标邮箱的访问控制列表（ACL）检查。具体而言，一个经过身份验证的用户，即使没有目标邮箱的插入权限，只要拥有另一个用户处于“snooze”状态邮箱的插入权限，就可以将邮件插入该用户的收件箱（inbox），或者插入该用户其他已知 ID 的邮箱，从而绕过正常的权限控制。

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 3

VendorProduct Version RangeStatus
cyrusimap Cyrus IMAP < 3.8.8 affected
3.9.0< 3.10.4 affected
3.11.0< 3.12.4 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-61907

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
cyrusimap Cyrus IMAP 0 ~ 3.8.8 -

II. Public POCs for CVE-2026-61907

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-61907

请登录查看更多情报信息。

Vendor Pages for CVE-2026-61907 (4)

Same Patch Batch · cyrusimap · 2026-09-09 · 6 CVEs total

CVE-2026-61911 4.3 MEDIUM Cyrus IMAP 3.12.4前Sieve邮箱存在性预言
CVE-2026-61915 4.2 MEDIUM Cyrus IMAP 3.12.4前 认证用户致CalDAV进程崩溃
CVE-2026-61910 3.5 LOW Cyrus IMAP 3.12.4前共享邮箱权限控制缺陷
CVE-2026-61909 3.5 LOW Cyrus IMAP 3.12.4前 CalDAV多获取ACL绕过
CVE-2026-61908 3.1 LOW Cyrus IMAP<3.12.4 JMAP越界读堆内存

IV. Related Vulnerabilities

Same product: Cyrus IMAP
Same vendor: cyrusimap
Same weakness: CWE-863

V. Comments for CVE-2026-61907

No comments yet

Leave a comment