CVE-2026-86347

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 allow any authenticated user to access TemplatesController::uploadFile() because the ACL entry for templates/uploadFile used the wildcard *. This bypasses the intended role restrictions applied to neighboring template-management operations.

The upload handler accepts arbitrary content with only minimal checks and writes it into app/tmp/files/. A low-privileged or read-only user can therefore repeatedly upload files and consume server disk space without requiring perm_add or perm_template. The fix changes the ACL requirement from * to perm_add.

The commit also rules out stronger impacts: uploaded files receive random names, path traversal/predictable overwrite is not available, the temporary directory is outside the web root, and the files are not directly served over HTTP. Therefore, the issue should not be described as arbitrary file overwrite, stored XSS, or RCE.

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
35%
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 8e8885971 (MISP/MISP)

Fix landed in MISP/MISP commit 8e8885971 — awaiting tagged release

https://github.com/MISP/MISP/commit/8e8885971

Vendor Advisories for CVE-2026-86347(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 / 58× 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 02:11 UTCEG score recompute
  2. 2026-09-25 02:11 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 01:34 UTCEG score recompute
  5. 2026-09-24 01:34 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 00:58 UTCEG score recompute
  8. 2026-09-23 00:58 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 00:22 UTCEG score recompute
  11. 2026-09-22 00:22 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-20 23:46 UTCEG score recompute
  14. 2026-09-20 23:46 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-19 23:09 UTCEG score recompute
  17. 2026-09-19 23:08 UTCGHSA enrichment
  18. 2026-09-18 22:31 UTCEG score recompute
  19. 2026-09-18 22:31 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-17 21:55 UTCEG score recompute
  22. 2026-09-17 21:55 UTCGHSA enrichment
  23. 2026-09-17 19:32 UTCEPSS rescore
  24. 2026-09-16 21:18 UTCEG score recompute
  25. 2026-09-16 21:18 UTCGHSA enrichment
Show 33 more
  1. 2026-09-16 14:09 UTCEPSS rescore
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-15 19:54 UTCEG score recompute
  4. 2026-09-15 19:54 UTCGHSA enrichment
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-14 19:18 UTCGHSA enrichment
  8. 2026-09-13 18:41 UTCEG score recompute
  9. 2026-09-13 18:41 UTCGHSA enrichment
  10. 2026-09-12 18:04 UTCEG score recompute
  11. 2026-09-12 18:04 UTCGHSA enrichment
  12. 2026-09-11 17:25 UTCEG score recompute
  13. 2026-09-11 17:25 UTCGHSA enrichment
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-10 16:15 UTCEG score recompute
  17. 2026-09-10 16:14 UTCGHSA enrichment
  18. 2026-09-09 15:31 UTCEG score recompute▼ 0.60
  19. 2026-09-09 15:31 UTCGHSA enrichment
  20. 2026-09-09 15:26 UTCNVD updateCVSS v3 → 6.5 · severity → MEDIUM
  21. 2026-09-09 15:22 UTCGHSA enrichment
  22. 2026-09-09 03:41 UTCEG score recompute
  23. 2026-09-09 03:41 UTCGHSA enrichment
  24. 2026-09-08 22:01 UTCEPSS rescore
  25. 2026-09-08 16:01 UTCEG score recompute
  26. 2026-09-08 16:00 UTCGHSA enrichment
  27. 2026-09-08 15:00 UTCEG score recompute
  28. 2026-09-08 14:59 UTCGHSA enrichment
  29. 2026-09-08 09:57 UTCGHSA enrichment
  30. 2026-09-07 22:01 UTCGHSA enrichment
  31. 2026-09-07 10:20 UTCEG score recompute
  32. 2026-09-07 09:38 UTCEG score recompute
  33. 2026-09-07 09:36 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86347?
CVE-2026-86347 is a medium vulnerability published on September 7, 2026. Affected versions of MISP allow any authenticated user to access TemplatesController::uploadFile() because the ACL entry for templates/uploadFile used the wildcard *. This bypasses the intended role restrictions applied to neighboring template-management operations. The upload handler accepts…
When was CVE-2026-86347 disclosed?
CVE-2026-86347 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-2026-86347 actively exploited?
CVE-2026-86347 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 65.5% of all scored CVEs.
What is the CVSS score of CVE-2026-86347?
CVE-2026-86347 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-86347?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86347, 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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