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.
npx skills add allsmog/vuln-scout --skill cache-poisoninggit clone --depth 1 https://github.com/allsmog/vuln-scoutWrote 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.
[](https://agentmods.dev/skills/allsmog/vuln-scout/cache-poisoning)<a href="https://agentmods.dev/skills/allsmog/vuln-scout/cache-poisoning"><img src="https://agentmods.dev/badge/skills/allsmog/vuln-scout/cache-poisoning/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/allsmog/vuln-scout/cache-poisoning"><img src="https://agentmods.dev/badge/skills/allsmog/vuln-scout/cache-poisoning.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00064 | $0.03188 |
| Opus 5 | $0.00032 | $0.01594 |
| Sonnet 5 | $0.00013 | $0.00638 |
| Haiku 4.5 | $0.00006 | $0.00319 |
Grade A, and why
Cache Poisoning 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 11d 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.
grep -rniE "requests\.get|http\.Get|fetch\(|axios\.|urllib" --include="*.py" --include="*.go" --include="*.js" --include="*.ts" How it starts
The opening of the file, as written. The whole thing — 409 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cache Poisoning & Web Cache Deception
Purpose
Provide detection patterns for HTTP cache poisoning and web cache deception vulnerabilities, including proxy cache misconfigurations, cache key manipulation, and authenticated response caching.
OWASP Top 10 Mapping
Category: Related to A01 (Broken Access Control), A05 (Security Misconfiguration)
CWEs:
- CWE-524: Use of Cache Containing Sensitive Information
- CWE-525: Use of Web Browser Cache Containing Sensitive Information
- CWE-444: Inconsistent Interpretation of HTTP Requests
- CWE-436: Interpretation Conflict
When to Use
Activate this skill when:
- Reviewing proxy/CDN configurations (Nginx, Varnish, Cloudflare, etc.)
- Analyzing SSRF vulnerabilities for exfiltration vectors
- Auditing applications with static file caching
- Looking for authenticated content exposure
- Checking cache key construction for manipulation
Web Cache Deception
Overview
Web cache deception occurs when:
- Proxy caches responses based on file extension (e.g.,
.png,.css) - Application serves dynamic content regardless of path extension
- Attacker tricks victim into visiting
/profile.png - Proxy caches authenticated response
- Attacker retrieves cached sensitive data
Detection Patterns
Nginx Cache Configuration
# Find proxy cache configurations
grep -rniE "proxy_cache|proxy_cache_valid|proxy_cache_key" --include="*.conf" --include="nginx.conf"
# Check cache rules for static extensions (HIGH RISK)
grep -rniE "location.*\.(css|js|png|jpg|jpeg|gif|ico|svg|woff)" -A10 --include="*.conf" | grep -iE "proxy_cache|cache"
# Cache key analysis - look for missing user identification
grep -rniE "proxy_cache_key" --include="*.conf"
# Caching authenticated responses (CRITICAL if no Vary header)
grep -rniE "proxy_cache_valid\s+200" --include="*.conf"
Varnish Cache Configuration
# VCL cache rules
grep -rniE "vcl_recv|vcl_hash|vcl_backend_response" --include="*.vcl"
# Static extension caching
grep -rniE "req\.url.*\.(css|js|png|jpg|jpeg|gif|ico)" --include="*.vcl"
# Cache TTL settings
grep -rniE "set beresp\.ttl|beresp\.grace" --include="*.vcl"
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.
- 11d ago First seen · 409 lines · 64 tokens per session scan A 7602987c0982
Cache Poisoning is a skill published in the GitHub repository allsmog/vuln-scout (24 stars, last pushed 3mo ago), licensed MIT. It adds 64 tokens to every session and 3,188 once invoked, about $0.0003 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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