HOMEVULNERABILITIESCVE-2026-40868
HIGH

CVE-2026-40868

CWE-922Published: April 21, 2026· Updated: Apr 27, 2026

8.1
CVSS v3.1
EPSS:0.03%probability of exploitation in 30 daysPercentile:8.8th

Official Description

Kyverno is a policy engine designed for cloud native platform engineering teams. Prior to 1.16.4, kyverno’s apiCall servicecall helper implicitly injects Authorization: Bearer ... using the kyverno controller serviceaccount token when a policy does not explicitly set an Authorization header. Because context.apiCall.service.url is policy-controlled, this can send the kyverno serviceaccount token to an attacker-controlled endpoint (confused deputy). Namespaced policies are blocked from servicecall usage by the namespaced urlPath gate in pkg/engine/apicall/apiCall.go, so this report is scoped to ClusterPolicy and global context usage. This vulnerability is fixed in 1.16.4.

NVD Source

Technical Analysis

CVE-2026-40868 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), with a CVSS base score of 8.1.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected Vendors & Products

kyverno1 product
kyverno
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/kyverno/kyverno/security/advisories/GHSA-q93q-v844-jrqp
ADVISORYhttps://github.com/kyverno/kyverno/security/advisories/GHSA-q93q-v844-jrqp

All References (2)

→
https://github.com/kyverno/kyverno/security/advisories/GHSA-q93q-v844-jrqpExploit · Mitigation · Vendor Advisory
→
https://github.com/kyverno/kyverno/security/advisories/GHSA-q93q-v844-jrqpExploit · Mitigation · Vendor Advisory

Quick Facts

CVE IDCVE-2026-40868
CVSS Score8.1 / 10
SeverityHIGH
WeaknessCWE-922
CISA KEVNo
EPSS (30d)0.03%
Affected1 vendor
PublishedApr 21, 2026

Related CVEs (CWE-922)

CVE-2026-26152
7.0
CVE-2025-32751
5.5
CVE-2025-32746
5.5
CVE-2025-10734
5.3
CVE-2026-7257
4.4

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-40868 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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