CVE-2026-86408

MEDIUMNVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-07. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

Affected versions of MISP do not enforce parent-event visibility when serving cryptographic keys through CryptographicKeysController::view().

The vulnerable handler queried CryptographicKey directly using the supplied key ID and selected sensitive fields such as:

* type

* key_data

* fingerprint

but did not fetch or authorize the associated parent event first.

The upstream commit explicitly states that cryptographicKeys/view could return a protected event’s signing key to any authenticated user.

The fix adds parent_id and parent_type to the lookup and then enforces authorization through the associated event using fetchSimpleEvent($user, parent_id). If the parent is not an Event, access is limited to site administrators.

Version affected: ≤2.5.45

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
10%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 9, 2026

Advisory Details (1)

Auto-updated Sep 7, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit 2edde619b (MISP/MISP)

Fix landed in MISP/MISP commit 2edde619b — awaiting tagged release

https://github.com/MISP/MISP/commit/2edde619b

Vendor Advisories for CVE-2026-86408(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 45× 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. 2026-09-21 05:39 UTCEG score recompute
  2. 2026-09-21 05:39 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 04:23 UTCEG score recompute
  5. 2026-09-20 04:23 UTCGHSA enrichment
  6. 2026-09-19 03:08 UTCEG score recompute
  7. 2026-09-19 03:08 UTCGHSA enrichment
  8. 2026-09-18 19:28 UTCEPSS rescore
  9. 2026-09-18 01:53 UTCEG score recompute
  10. 2026-09-18 01:53 UTCGHSA enrichment
  11. 2026-09-17 19:32 UTCEPSS rescore
  12. 2026-09-17 00:38 UTCEG score recompute
  13. 2026-09-17 00:38 UTCGHSA enrichment
  14. 2026-09-16 14:09 UTCEPSS rescore
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 23:22 UTCEG score recompute
  17. 2026-09-15 23:22 UTCGHSA enrichment
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-15 03:12 UTCEPSS rescore
  20. 2026-09-14 21:48 UTCGHSA enrichment
  21. 2026-09-13 20:33 UTCEG score recompute
  22. 2026-09-13 20:33 UTCGHSA enrichment
  23. 2026-09-12 19:18 UTCEG score recompute
  24. 2026-09-12 19:18 UTCGHSA enrichment
  25. 2026-09-11 18:03 UTCEG score recompute
Show 20 more
  1. 2026-09-11 18:03 UTCGHSA enrichment
  2. 2026-09-11 14:53 UTCEPSS rescore
  3. 2026-09-11 14:53 UTCEPSS rescore
  4. 2026-09-10 16:47 UTCEG score recompute
  5. 2026-09-10 16:47 UTCGHSA enrichment
  6. 2026-09-09 15:31 UTCEG score recompute▼ 0.60
  7. 2026-09-09 15:31 UTCGHSA enrichment
  8. 2026-09-09 15:26 UTCNVD updateCVSS v3 → 6.5 · severity → MEDIUM
  9. 2026-09-09 14:31 UTCGHSA enrichment
  10. 2026-09-09 03:13 UTCEG score recompute
  11. 2026-09-09 03:13 UTCGHSA enrichment
  12. 2026-09-08 22:01 UTCEPSS rescore
  13. 2026-09-08 15:57 UTCEG score recompute
  14. 2026-09-08 15:57 UTCGHSA enrichment
  15. 2026-09-08 14:51 UTCGHSA enrichment
  16. 2026-09-08 12:10 UTCGHSA enrichment
  17. 2026-09-08 00:51 UTCGHSA enrichment
  18. 2026-09-07 13:35 UTCEG score recompute
  19. 2026-09-07 12:29 UTCEG score recompute
  20. 2026-09-07 12:26 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86408?
CVE-2026-86408 is a medium vulnerability published on September 7, 2026. Affected versions of MISP do not enforce parent-event visibility when serving cryptographic keys through CryptographicKeysController::view(). The vulnerable handler queried CryptographicKey directly using the supplied key ID and selected sensitive fields such as: type key_data fingerprint but did…
When was CVE-2026-86408 disclosed?
CVE-2026-86408 was first published in the National Vulnerability Database on September 7, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86408 actively exploited?
CVE-2026-86408 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 89.7% of all scored CVEs.
What is the CVSS score of CVE-2026-86408?
CVE-2026-86408 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-86408?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86408, 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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