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.
git clone --depth 1 https://github.com/briiirussell/cybersecurity-skillsWrote 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/rules/briiirussell/cybersecurity-skills/vuln-research)<a href="https://agentmods.dev/rules/briiirussell/cybersecurity-skills/vuln-research"><img src="https://agentmods.dev/badge/rules/briiirussell/cybersecurity-skills/vuln-research/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/rules/briiirussell/cybersecurity-skills/vuln-research"><img src="https://agentmods.dev/badge/rules/briiirussell/cybersecurity-skills/vuln-research.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 | $0.00117 | $0.02490 |
| Opus 5.5 | $0.00047 | $0.00996 |
| Sonnet 5.5 | $0.00023 | $0.00498 |
| Haiku 4.5 | $0.00012 | $0.00249 |
Grade A, and why
vuln-research scanned grade A with 0 findings 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 today.
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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 200 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Vuln Research — CVE Deep-Dive and Applicability Assessment
When a CVE drops, the question isn't "do we have this package?" — dependency-audit answers that. The questions are:
- Is the vulnerable code path actually invoked in our usage?
- Is there a public proof-of-concept making this easy to exploit?
- Is there a patch? When? What's our exposure window if we can't deploy in 24 hours?
- If we can't patch, what's the mitigation?
- Is CISA tracking it as actively exploited?
This skill walks that workflow end-to-end. Pairs with dependency-audit (which surfaces the CVE in the first place) and finding-triage (which closes the disposition loop).
Authorization
Research vulnerabilities in code, dependencies and systems the user owns or is authorized to assess. Reading advisories, patches and public write-ups is fine. Reproduce a vulnerability only in an isolated environment the user controls, never against a live system you aren't authorized to test. Pre-disclosure details stay with the people entitled to them (see Boundaries).
Workflow
Step 1 — Pull the canonical sources
Start with the authoritative descriptions; everything downstream is summarized or sometimes wrong.
- NVD record —
https://nvd.nist.gov/vuln/detail/CVE-YYYY-NNNNN - Vendor advisory — search the vendor's security page; this is usually the most accurate description of which versions are affected and what the fix is
- GitHub Security Advisory —
https://github.com/advisories/GHSA-...(often more concise than NVD, sometimes has detail NVD lacks; check the parent project's security tab) - CISA Known Exploited Vulnerabilities catalog —
https://www.cisa.gov/known-exploited-vulnerabilities-catalog. If the CVE is here, treat as actively exploited — patch within CISA's stated due date - EPSS score —
https://www.first.org/epss/— Exploit Prediction Scoring System; a 30-day probability of exploitation. Useful tiebreaker between high-CVSS-low-EPSS vs medium-CVSS-high-EPSS
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.
- today Changed · +4 lines a1bd97dc5c27
- 1mo ago First seen · 196 lines · 117 tokens per session scan A 78a6307e5b64
vuln-research is a cursor rule published in the GitHub repository briiirussell/cybersecurity-skills (435 stars, last pushed today), licensed MIT. It adds 117 tokens to every session and 2,490 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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