CVE-2026-26055Public exploitNetwork attack vector

Unauthorized WASM execution via unauthenticated webhook requests

Published Feb 12, 2026 · Updated Feb 12, 2026

Authentication bypass in Yoke ATC 0.19.0 and earlier allows remote attackers to trigger WASM execution via AdmissionReview requests. The HTTP handlers decode and process untrusted AdmissionReview bodies without client-certificate verification, source validation, or authentication middleware. Reachability requires access from a pod or other client on the cluster network, and successful requests run the selected WASM module with the ATC controller's authority.

CVSS severity7.5
High
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Yoke ATC 0.19.0 and earlier allows remote attackers to trigger WASM execution via AdmissionReview requests. The HTTP handlers decode and process untrusted AdmissionReview bodies without client-certificate verification, source validation, or authentication middleware. Reachability requires access from a pod or other client on the cluster network, and successful requests run the selected WASM module with the ATC controller's authority.

The record

CVE
CVE-2026-26055
Published
Feb 12, 2026
Updated
Feb 12, 2026
Vendor
YokeCD
Product
Yoke
Classifications
CWE-306, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 0.19.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

YokeCD · Yokeversion=<= 0.19.0

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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