CVE-2026-61910

MEDIUMNVD 5.05.0—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.0 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 91% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.0Exploit: 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. 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.)

CVSS v3
5.0
EG Score
5.0(medium)
EG Risk
23(Track)
EG Risk 23/100SSVC: 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
Severity50% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 16, 2026

Advisory Details (4)

Auto-updated Sep 16, 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 3.12.4 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

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

What is Cyrus IMAP? — Cyrus IMAP 3.12.4 documentation

https://cyrusimap.org

Vendor Advisories for CVE-2026-61910(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 / 34× 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. 2026-09-24 13:05 UTCEG score recompute
  2. 2026-09-24 13:05 UTCGHSA enrichment
  3. 2026-09-23 17:54 UTCEPSS rescore
  4. 2026-09-23 13:26 UTCEG score recompute
  5. 2026-09-23 13:26 UTCGHSA enrichment
  6. 2026-09-22 13:46 UTCEG score recompute
  7. 2026-09-22 13:46 UTCGHSA enrichment
  8. 2026-09-21 14:08 UTCEG score recompute
  9. 2026-09-21 14:07 UTCGHSA enrichment
  10. 2026-09-20 20:16 UTCEPSS rescore
  11. 2026-09-20 14:28 UTCEG score recompute
  12. 2026-09-20 14:28 UTCGHSA enrichment
  13. 2026-09-19 14:49 UTCEG score recompute
  14. 2026-09-19 14:49 UTCGHSA enrichment
  15. 2026-09-18 19:28 UTCEPSS rescore
  16. 2026-09-18 15:10 UTCEG score recompute
  17. 2026-09-18 15:10 UTCGHSA enrichment
  18. 2026-09-17 15:30 UTCGHSA enrichment
  19. 2026-09-16 15:43 UTCEG score recompute▲ 1.50
  20. 2026-09-16 15:43 UTCGHSA enrichment
  21. 2026-09-16 15:43 UTCNVD updateCVSS v3 → 5 · severity → MEDIUM
  22. 2026-09-16 14:08 UTCEPSS rescore
  23. 2026-09-16 05:15 UTCEPSS rescore
  24. 2026-09-14 16:26 UTCEG score recompute
  25. 2026-09-14 16:26 UTCGHSA enrichment
Show 9 more
  1. 2026-09-14 15:50 UTCEG score recompute
  2. 2026-09-14 15:50 UTCGHSA enrichment
  3. 2026-09-13 00:37 UTCEG score recompute
  4. 2026-09-13 00:37 UTCGHSA enrichment
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 09:37 UTCEPSS rescore
  7. 2026-09-09 20:48 UTCEG score recompute
  8. 2026-09-09 20:00 UTCEG score recompute
  9. 2026-09-09 19:59 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-61910?
CVE-2026-61910 is a medium vulnerability published on September 9, 2026. 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…
When was CVE-2026-61910 disclosed?
CVE-2026-61910 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-61910 actively exploited?
CVE-2026-61910 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 77.0% of all scored CVEs.
What is the CVSS score of CVE-2026-61910?
CVE-2026-61910 has a CVSS v3 base score of 5.0 (NVD).
How do I remediate CVE-2026-61910?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-61910, 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-2026-61910

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