CVE-2026-12284

LOWPre-NVD 3.73.7—
EchelonGraph scoreHIGH confidence

Score 3.7 from GitHub Security Advisory (severity: LOW) published 2026-09-17. a secondary CVSS source baseline 3.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 5 sources updated this week
3.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 3.7Exploit: None knownExposed: 0

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

Mattermost Desktop App versions <=6.2 6.2.2.0 fails to validate the IPC sender in the leaveCall handler which allows a malicious or compromised Mattermost server (or a user with script access to a connected server view) to disconnect an active call belonging to a different connected server via the desktopAPI.leaveCall IPC message. Mattermost Advisory ID: MMSA-2026-00699

CVSS v3
3.7
EG Score
3.7(high)
EG Risk
17(Track)
EG Risk 17/100SSVC: 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
Severity37% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

September 17, 2026

Last Modified

September 18, 2026

References (1)

Vendor Advisories for CVE-2026-12284(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 12× in last 7d / 12× 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. 2026-09-18 19:27 UTCEPSS rescore
  2. 2026-09-18 14:00 UTCGHSA enrichment
  3. 2026-09-17 20:18 UTCEG score recompute▼ 0.10
  4. 2026-09-17 20:18 UTCGHSA enrichment
  5. 2026-09-17 20:17 UTCNVD updateCVSS v3 → 3.7
  6. 2026-09-17 19:30 UTCEG score recompute▲ 0.10
  7. 2026-09-17 19:30 UTCGHSA enrichment
  8. 2026-09-17 19:29 UTCMITRE cvelistV5CVSS v3 → 3.8
  9. 2026-09-17 17:57 UTCEG score recompute▼ 0.10
  10. 2026-09-17 16:23 UTCNVD updateCVSS v3 → 3.7
  11. 2026-09-17 15:25 UTCEG score recompute
  12. 2026-09-17 15:24 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-12284?
CVE-2026-12284 is a low vulnerability published on September 17, 2026. Mattermost Desktop App versions <=6.2 6.2.2.0 fails to validate the IPC sender in the leaveCall handler which allows a malicious or compromised Mattermost server (or a user with script access to a connected server view) to disconnect an active call belonging to a different connected server via the…
When was CVE-2026-12284 disclosed?
CVE-2026-12284 was first published in the National Vulnerability Database on September 17, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12284 actively exploited?
CVE-2026-12284 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 96.9% of all scored CVEs.
What is the CVSS score of CVE-2026-12284?
CVE-2026-12284 has a CVSS v3 base score of 3.7 (NVD).
How do I remediate CVE-2026-12284?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12284, 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

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