CVE-2026-87987

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 74% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 10.0Exploit: None knownExposed: 0

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

An arbitrary code execution vulnerability in Mistral Vibe allows an attacker to bypass command permission checks using environment variable assignments preceding allowlisted commands. These assignments are excluded from inspection, enabling attacker-controlled environment variables to cause arbitrary code execution without user approval.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity100% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 11, 2026

Advisory Details (1)

Auto-updated Sep 11, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available
https://www.hiddenlayer.com/sai-security-advisory/2026-09-mistral-vibe5

Vendor Advisories for CVE-2026-87987(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 31× in last 7d / 31× 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. 2026-09-15 08:02 UTCGHSA enrichment
  2. 2026-09-15 03:45 UTCEG score recompute
  3. 2026-09-15 03:45 UTCGHSA enrichment
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-14 23:28 UTCGHSA enrichment
  6. 2026-09-14 18:38 UTCGHSA enrichment
  7. 2026-09-14 14:20 UTCGHSA enrichment
  8. 2026-09-14 10:03 UTCGHSA enrichment
  9. 2026-09-14 05:47 UTCGHSA enrichment
  10. 2026-09-14 01:30 UTCGHSA enrichment
  11. 2026-09-13 21:13 UTCGHSA enrichment
  12. 2026-09-13 16:57 UTCEG score recompute
  13. 2026-09-13 16:57 UTCGHSA enrichment
  14. 2026-09-13 16:48 UTCEPSS rescore
  15. 2026-09-13 12:40 UTCGHSA enrichment
  16. 2026-09-13 08:23 UTCGHSA enrichment
  17. 2026-09-13 04:07 UTCGHSA enrichment
  18. 2026-09-12 23:51 UTCGHSA enrichment
  19. 2026-09-12 19:34 UTCGHSA enrichment
  20. 2026-09-12 15:18 UTCEG score recompute
  21. 2026-09-12 15:18 UTCGHSA enrichment
  22. 2026-09-12 15:02 UTCEPSS rescore
  23. 2026-09-12 11:01 UTCGHSA enrichment
  24. 2026-09-12 06:43 UTCGHSA enrichment
  25. 2026-09-12 02:26 UTCGHSA enrichment
Show 6 more
  1. 2026-09-11 22:09 UTCGHSA enrichment
  2. 2026-09-11 17:53 UTCGHSA enrichment
  3. 2026-09-11 15:28 UTCEG score recompute
  4. 2026-09-11 15:04 UTCEG score recompute
  5. 2026-09-11 14:44 UTCEG score recompute
  6. 2026-09-11 14:43 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-87987?
CVE-2026-87987 is a critical vulnerability published on September 11, 2026. An arbitrary code execution vulnerability in Mistral Vibe allows an attacker to bypass command permission checks using environment variable assignments preceding allowlisted commands. These assignments are excluded from inspection, enabling attacker-controlled environment variables to cause…
When was CVE-2026-87987 disclosed?
CVE-2026-87987 was first published in the National Vulnerability Database on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87987 actively exploited?
CVE-2026-87987 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 73.7% of all scored CVEs.
What is the CVSS score of CVE-2026-87987?
CVE-2026-87987 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-87987?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87987, 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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