4.3

CVE-2026-61907: cyrusimap cyrus_imap Incorrect Authorization

CVSS: 4.3v3.1MediumDeferred
AliasesUBUNTU-CVE-2026-61907DEBIAN-CVE-2026-61907
Published 09-09-2026Last modified 14-09-2026
Open JSON

Vulnerability summary

CVE-2026-61907 is a medium (CVSS 4.3) Incorrect Authorization vulnerability in cyrusimap cyrus_imap. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 11% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.21%
0%100%
Low · -0.14 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:21929-1

Timeline

  1. 09-09-2026
    PublishedVulnerability first disclosed.
  2. 14-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

11%

Versus all other CVEs

30-day change

-0.14 pp

From 0.35% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.21%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cyrusimap1 product
  • cyrus_imap< 3.8.8 | ≥ 3.9.0, < 3.10.4 | ≥ 3.11.0, < 3.12.4
Debian1 product
  • cyrus-imapdAll versions (No fix recorded) | < 3.12.4-1
Ubuntu1 product
  • cyrus-imapdAll versions (No fix recorded)

3 vendors · 3 products

References

7 links