CVE-2026-100707

HIGHPre-NVD 7.77.7—
EchelonGraph scoreHIGH confidence

Score 7.7 from GitHub Security Advisory (severity: HIGH) published 2026-09-26. A secondary CVSS source baseline 7.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.7Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Kyverno before 1.19.1 contains a namespace isolation bypass in the apiCall context entry of namespaced Policy resources due to inconsistent path interpretation between validation and execution. A low-privilege tenant can use percent-encoded dot-segments in urlPath to bypass namespace checks and read resources from other namespaces using the Kyverno admission controller's ServiceAccount credentials.

CVSS v3
7.7
EG Score
7.7HIGHhigh confidence
EG Risk
51
EG Risk 51/100CISA SSVC

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
Severity77% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
37th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 26, 2026

Last Modified

September 28, 2026

Advisory Details (2)

Auto-updated Sep 26, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Kyverno before 1.19.1 Namespace Isolation Bypass via Percent-Encoded Path | Advisories | VulnCheck

https://www.vulncheck.com/advisories/kyverno-before-1.19.1-namespace-isolation-bypass-via-percent-encoded-path
github Patch Available🟡 PoC Available

Namespace isolation bypass in namespaced Policy `apiCall` via percent-encoded path segments · Advisory · kyverno/kyverno · GitHub

https://github.com/kyverno/kyverno/security/advisories/GHSA-c5qq-7g2q-cpqp

Vendor Advisories for CVE-2026-100707(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 32× in last 7d / 40× 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. 2026-10-04 23:21 UTCEPSS rescore
  2. 2026-10-04 22:14 UTCGHSA enrichment
  3. 2026-10-04 10:56 UTCGHSA enrichment
  4. 2026-10-03 23:39 UTCEG score recompute
  5. 2026-10-03 23:39 UTCGHSA enrichment
  6. 2026-10-03 14:25 UTCEPSS rescore
  7. 2026-10-03 12:20 UTCGHSA enrichment
  8. 2026-10-03 01:02 UTCEG score recompute
  9. 2026-10-03 01:02 UTCGHSA enrichment
  10. 2026-10-02 13:44 UTCGHSA enrichment
  11. 2026-10-02 02:23 UTCEG score recompute
  12. 2026-10-02 02:23 UTCGHSA enrichment
  13. 2026-10-01 19:49 UTCEPSS rescore
  14. 2026-10-01 14:52 UTCGHSA enrichment
  15. 2026-10-01 03:34 UTCGHSA enrichment
  16. 2026-09-30 16:17 UTCEG score recompute
  17. 2026-09-30 16:17 UTCGHSA enrichment
  18. 2026-09-30 15:02 UTCEPSS rescore
  19. 2026-09-30 04:17 UTCGHSA enrichment
  20. 2026-09-29 16:59 UTCEG score recompute
  21. 2026-09-29 16:59 UTCGHSA enrichment
  22. 2026-09-29 15:20 UTCEPSS rescore
  23. 2026-09-29 05:38 UTCEG score recompute
  24. 2026-09-29 05:38 UTCGHSA enrichment
  25. 2026-09-28 18:21 UTCEG score recompute
Show 15 more
  1. 2026-09-28 18:21 UTCGHSA enrichment
  2. 2026-09-28 17:49 UTCEG score recompute
  3. 2026-09-28 17:49 UTCGHSA enrichment
  4. 2026-09-28 15:27 UTCEG score recompute
  5. 2026-09-28 15:26 UTCGHSA enrichment
  6. 2026-09-28 13:50 UTCEPSS rescore
  7. 2026-09-28 11:42 UTCGHSA enrichment
  8. 2026-09-28 00:23 UTCEG score recompute
  9. 2026-09-28 00:23 UTCGHSA enrichment
  10. 2026-09-27 13:05 UTCGHSA enrichment
  11. 2026-09-27 01:48 UTCEG score recompute
  12. 2026-09-27 01:47 UTCGHSA enrichment
  13. 2026-09-26 14:26 UTCEG score recompute
  14. 2026-09-26 13:34 UTCEG score recompute
  15. 2026-09-26 13:30 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-100707?
CVE-2026-100707 is a high vulnerability published on September 26, 2026. Kyverno before 1.19.1 contains a namespace isolation bypass in the apiCall context entry of namespaced Policy resources due to inconsistent path interpretation between validation and execution. A low-privilege tenant can use percent-encoded dot-segments in urlPath to bypass namespace checks and…
When was CVE-2026-100707 disclosed?
CVE-2026-100707 was first published on September 26, 2026, with the most recent update on September 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-100707 actively exploited?
CVE-2026-100707 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100707?
CVE-2026-100707 has a CVSS base score of 7.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100707?
A fix for CVE-2026-100707 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-100707 are linked in the Vendor Advisories panel on this page.

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