k8s-webhook-abuse

k8s-webhook-abuse is a skill for Claude Code, Codex from wgpsec/AboutSecurity. It costs 102 tokens per session (1,193 once invoked), scanned A, original, no licence file.

A guide to assessing Kubernetes admission webhooks and policy engines. These components inspect or modify requests before Kubernetes accepts them; examples include Kyverno, OPA Gatekeeper, and custom webhooks.

In plain words
What is it for?
Use it when webhook or policy-engine services are present, including situations involving Kyverno, Gatekeeper, custom webhooks, or Secrets added by mutating webhooks.
Why use it?
It helps investigate whether webhook services or policy rules can be misused to alter admission requests or expose injected configuration data.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/wgpsec/aboutsecurity/k8s-webhook-abuse
Any agent
npx skills add wgpsec/AboutSecurity --skill k8s-webhook-abuse
Clone the repo
git clone --depth 1 https://github.com/wgpsec/AboutSecurity

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for k8s-webhook-abuse

README.md
[![agentmods](https://agentmods.dev/badge/skills/wgpsec/aboutsecurity/k8s-webhook-abuse.svg)](https://agentmods.dev/skills/wgpsec/aboutsecurity/k8s-webhook-abuse)
Your own site
<a href="https://agentmods.dev/skills/wgpsec/aboutsecurity/k8s-webhook-abuse"><img src="https://agentmods.dev/badge/skills/wgpsec/aboutsecurity/k8s-webhook-abuse.svg" alt="Measured on agentmods" height="20"></a>
Per session 102 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,193 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00102 $0.01193
Opus 5 $0.00051 $0.00596
Sonnet 5 $0.00020 $0.00239
Haiku 4.5 $0.00010 $0.00119

Measured 6d ago against content hash 9a939b9bb1e0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

k8s-webhook-abuse scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -k https://kyverno-svc.kyverno.svc.cluster.local/mutate
skills/cloud/k8s-webhook-abuse/SKILL.md · 123 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 6d ago First seen · 123 lines · 102 tokens per session scan A 9a939b9bb1e0

Subscribe to this mod's changes

k8s-webhook-abuse is a skill published in the GitHub repository wgpsec/AboutSecurity (1,716 stars, last pushed 6d ago), with no licence file. It adds 102 tokens to every session and 1,193 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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