9.9

CVE-2026-100706: kyverno before 1.19.1 Privilege Escalation via Policy apiCall urlPath

Awaiting analysis
AliasesCGA-3f7q-v97c-27j3CGA-8346-p8rx-56jfCGA-f346-jpv9-qxfw
Published 26-09-2026Last modified 26-09-2026

Vulnerability summary

CVE-2026-100706 is a critical (CVSS 9.9) Unintended Proxy or Intermediary vulnerability in kyverno. EPSS estimates a 0.61% chance of exploitation in the next 30 days, higher than 49.3% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 9.4 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
9.9/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.61%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 26-09-2026
    PublishedVulnerability first disclosed.
  2. 26-09-2026
    Last modifiedVulnerability information updated.

Description

kyverno before 1.19.1 fails to properly validate URL-encoded path segments in Policy apiCall urlPath, allowing namespace tenants to bypass the per-namespace clamp and create objects in other namespaces as the admission-controller ServiceAccount. Attackers can exploit this by using percent-encoded directory traversal sequences to create MutatingWebhookConfiguration objects cluster-wide or PolicyException objects in the kyverno namespace, enabling privilege escalation to cluster admin.

CVSS metrics

4 scores · 2 sources · 2 versions

EPSS trend

Probability

0.61%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.61% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard4 products
  • kyverno-1.15All versions (No fix recorded)
  • kyverno-1.16All versions (No fix recorded)
  • kyverno-1.17All versions (No fix recorded)
  • kyverno-1.18All versions (No fix recorded)
Wolfi2 products
  • kyverno-1.17All versions (No fix recorded)
  • kyverno-1.18All versions (No fix recorded)
Kyverno1 product

3 vendors · 7 products

References

2 links