CVE-2026-86342

MEDIUMNVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-09-07. NVD baseline CVSS 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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.

Affected versions of MISP contain improper authorization checks in the freetext feed preview functionality. The preview performed correlation lookups against attributes from events without applying the requesting user's ACL, allowing restricted event correlations and associated event information to be exposed to users who could not otherwise access those events. The vulnerable queries were scoped only by attribute values and deletion status rather than MISP's event, organization, sharing-group, attribute, and object-level access controls.

The same preview functionality also returned cross-feed correlation information without properly restricting the feed list to feeds visible to the caller. This exposed metadata for feeds that were not marked lookup_visible; one affected response additionally included the configured feed URL even though that value was not required by the feature.

The fixes apply the caller's ACL to attribute correlation searches, remove feed URLs from correlation results, restrict cross-feed results according to feed visibility, and correct host-organization ID comparison so the authorization rules are applied consistently.

Version affected: ≤2.5.45

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
25%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 9, 2026

Advisory Details (4)

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

commit 1fb622046 (MISP/MISP)

Fix landed in MISP/MISP commit 1fb622046 — awaiting tagged release

https://github.com/MISP/MISP/commit/1fb622046
github_commit

commit dc1a0f7c2 (MISP/MISP)

Fix landed in MISP/MISP commit dc1a0f7c2 — awaiting tagged release

https://github.com/MISP/MISP/commit/dc1a0f7c2
github_commit

commit 4b6916086 (MISP/MISP)

Fix landed in MISP/MISP commit 4b6916086 — awaiting tagged release

https://github.com/MISP/MISP/commit/4b6916086
github_commit

commit dedb4b297 (MISP/MISP)

Fix landed in MISP/MISP commit dedb4b297 — awaiting tagged release

https://github.com/MISP/MISP/commit/dedb4b297

Vendor Advisories for CVE-2026-86342(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 18× in last 7d / 55× 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 00:43 UTCEG score recompute
  2. 2026-09-25 00:43 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-23 22:21 UTCEG score recompute
  5. 2026-09-23 22:21 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-22 19:59 UTCEG score recompute
  8. 2026-09-22 19:59 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-21 21:09 UTCEPSS rescore
  11. 2026-09-21 17:37 UTCEG score recompute
  12. 2026-09-21 17:37 UTCGHSA enrichment
  13. 2026-09-20 20:16 UTCEPSS rescore
  14. 2026-09-20 15:15 UTCEG score recompute
  15. 2026-09-20 15:14 UTCGHSA enrichment
  16. 2026-09-19 12:49 UTCEG score recompute
  17. 2026-09-19 12:49 UTCGHSA enrichment
  18. 2026-09-18 19:28 UTCEPSS rescore
  19. 2026-09-18 10:27 UTCEG score recompute
  20. 2026-09-18 10:27 UTCGHSA enrichment
  21. 2026-09-17 19:32 UTCEPSS rescore
  22. 2026-09-17 08:05 UTCEG score recompute
  23. 2026-09-17 08:05 UTCGHSA enrichment
  24. 2026-09-16 14:09 UTCEPSS rescore
  25. 2026-09-16 05:43 UTCEG score recompute
Show 30 more
  1. 2026-09-16 05:43 UTCGHSA enrichment
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-15 03:20 UTCEG score recompute
  4. 2026-09-15 03:20 UTCGHSA enrichment
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-14 00:59 UTCEG score recompute
  8. 2026-09-14 00:59 UTCGHSA enrichment
  9. 2026-09-12 22:37 UTCEG score recompute
  10. 2026-09-12 22:37 UTCGHSA enrichment
  11. 2026-09-11 20:15 UTCEG score recompute
  12. 2026-09-11 20:15 UTCGHSA enrichment
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-10 17:53 UTCEG score recompute
  16. 2026-09-10 17:53 UTCGHSA enrichment
  17. 2026-09-09 15:31 UTCEG score recompute▼ 1.00
  18. 2026-09-09 15:31 UTCGHSA enrichment
  19. 2026-09-09 15:26 UTCNVD updateCVSS v3 → 4.3
  20. 2026-09-08 22:01 UTCEPSS rescore
  21. 2026-09-08 16:02 UTCEG score recompute
  22. 2026-09-08 16:02 UTCGHSA enrichment
  23. 2026-09-08 15:00 UTCEG score recompute
  24. 2026-09-08 14:59 UTCGHSA enrichment
  25. 2026-09-08 12:43 UTCEG score recompute
  26. 2026-09-08 12:43 UTCGHSA enrichment
  27. 2026-09-07 10:20 UTCGHSA enrichment
  28. 2026-09-07 09:30 UTCEG score recompute
  29. 2026-09-07 09:06 UTCEG score recompute
  30. 2026-09-07 09:06 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86342?
CVE-2026-86342 is a medium vulnerability published on September 7, 2026. Affected versions of MISP contain improper authorization checks in the freetext feed preview functionality. The preview performed correlation lookups against attributes from events without applying the requesting user's ACL, allowing restricted event correlations and associated event information to…
When was CVE-2026-86342 disclosed?
CVE-2026-86342 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-2026-86342 actively exploited?
CVE-2026-86342 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 75.1% of all scored CVEs.
What is the CVSS score of CVE-2026-86342?
CVE-2026-86342 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-86342?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86342, 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.

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