CVE-2026-61907

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-09-09. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
4.3
EG Score
4.3(high)
EG Risk
19(Track)
EG Risk 19/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 14, 2026

Advisory Details (4)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

Cyrus IMAP 3.8.8 Release Notes — Cyrus IMAP 3.12.4 documentation

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

Cyrus IMAP 3.10.4 Release Notes — Cyrus IMAP 3.12.4 documentation

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

Cyrus IMAP 3.12.4 Release Notes — Cyrus IMAP 3.12.4 documentation

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

What is Cyrus IMAP? — Cyrus IMAP 3.12.4 documentation

https://cyrusimap.org

Vendor Advisories for CVE-2026-61907(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-25 01:46 UTCEG score recompute
  2. 2026-09-25 01:46 UTCGHSA enrichment
  3. 2026-09-24 01:01 UTCEG score recompute
  4. 2026-09-24 01:01 UTCGHSA enrichment
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-23 00:18 UTCEG score recompute
  7. 2026-09-23 00:18 UTCGHSA enrichment
  8. 2026-09-21 23:34 UTCEG score recompute
  9. 2026-09-21 23:34 UTCGHSA enrichment
  10. 2026-09-20 22:48 UTCEG score recompute
  11. 2026-09-20 22:48 UTCGHSA enrichment
  12. 2026-09-20 20:16 UTCEPSS rescore
  13. 2026-09-19 22:04 UTCEG score recompute
  14. 2026-09-19 22:04 UTCGHSA enrichment
  15. 2026-09-18 21:21 UTCEG score recompute
  16. 2026-09-18 21:20 UTCGHSA enrichment
  17. 2026-09-18 19:28 UTCEPSS rescore
  18. 2026-09-17 20:16 UTCEG score recompute
  19. 2026-09-17 20:16 UTCGHSA enrichment
  20. 2026-09-16 18:15 UTCEG score recompute
  21. 2026-09-16 18:15 UTCGHSA enrichment
  22. 2026-09-16 14:08 UTCEPSS rescore
  23. 2026-09-16 05:15 UTCEPSS rescore
  24. 2026-09-15 17:10 UTCEG score recompute
  25. 2026-09-15 17:10 UTCGHSA enrichment
Show 17 more
  1. 2026-09-14 16:26 UTCEG score recompute
  2. 2026-09-14 16:26 UTCGHSA enrichment
  3. 2026-09-14 15:50 UTCEG score recompute
  4. 2026-09-14 15:50 UTCGHSA enrichment
  5. 2026-09-13 23:09 UTCEG score recompute
  6. 2026-09-13 23:09 UTCGHSA enrichment
  7. 2026-09-12 22:25 UTCEG score recompute
  8. 2026-09-12 22:25 UTCGHSA enrichment
  9. 2026-09-11 21:40 UTCEG score recompute
  10. 2026-09-11 21:40 UTCGHSA enrichment
  11. 2026-09-11 14:53 UTCEPSS rescore
  12. 2026-09-11 09:37 UTCEPSS rescore
  13. 2026-09-10 20:56 UTCEG score recompute
  14. 2026-09-10 20:56 UTCGHSA enrichment
  15. 2026-09-09 19:29 UTCEG score recompute
  16. 2026-09-09 19:10 UTCEG score recompute
  17. 2026-09-09 19:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-61907?
CVE-2026-61907 is a medium vulnerability published on September 9, 2026. 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,…
When was CVE-2026-61907 disclosed?
CVE-2026-61907 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-61907 actively exploited?
CVE-2026-61907 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 72.4% of all scored CVEs.
What is the CVSS score of CVE-2026-61907?
CVE-2026-61907 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-61907?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-61907, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-61907

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