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yaklangSkillyaklang/hack-skills/skills/email-header-injection/SKILL.md
Email header injection and spoofing playbook. Use when testing contact forms, email APIs, password reset flows, or any feature that constructs SMTP messages with user-controlled fields. Covers CRLF injection in headers, SPF/DKIM/DMARC bypass, and phishing amplification.
3 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/expression-language-injection/SKILL.md
Expression Language injection playbook. Use when Java EL, SpEL, OGNL, or MVEL expressions may evaluate attacker-controlled input in Spring, Struts2, Confluence, or similar frameworks.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/file-access-vuln/SKILL.md
Entry P1 category router for file access and upload workflows. Use when testing download endpoints, file paths, local file inclusion, upload flows, preview pipelines, archive extraction, or storage and sharing boundaries.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/format-string-exploitation/SKILL.md
Format string exploitation playbook. Use when printf-family functions receive user-controlled format strings, enabling arbitrary stack reads (%p/%s), arbitrary memory writes (%n/%hn/%hhn), GOT/hook overwrites, and canary/libc/PIE leaks.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/ghost-bits-cast-attack/SKILL.md
Java "Ghost Bits" / Cast Attack playbook (Black Hat Asia 2026). Use when attacking Java services where 16-bit char is silently narrowed to 8-bit byte to bypass WAF/IDS for SQL injection, deserialization RCE, file upload (Webshell), path traversal, CRLF injection, request smuggling, and SMTP injection. Affects Tomcat, Spring, Jetty, Undertow, Vert.x, Jackson, Fastjson, Apache Commons BCEL, Apache HttpClient, Angus Mail, JDK HttpServer, Lettuce, Jodd, XMLWriter and re-enables many "patched" CVEs through WAF bypass.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/graphql-and-hidden-parameters/SKILL.md
GraphQL and hidden parameter testing playbook. Use when exploring introspection, batching, undocumented fields, hidden parameters, schema abuse, and GraphQL authorization gaps.
2 projects use a version of this
yaklangReads credentialsSkillyaklang/hack-skills/skills/hack/SKILL.md
Entry P0 primary router and operating doctrine for HackSkills. Use when the task involves web application testing, API security assessment, recon, vulnerability triage, exploit path planning, authorized pentest, code audit, source-leak mining, middleware audit, SOC triage, detection engineering, incident response, or choosing the right next category skill before any deep topic skill. Also use when the user mentions 安全工程师, 渗透测试, 红队, 蓝队, 代码审计, 源码泄露, SRC. Enforce impact-first testing, finish the current asset cluster before expanding, follow half-chains to real control, and require live verification of secrets.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/hash-attack-techniques/SKILL.md
Hash attack playbook. Use when exploiting length extension, MD5/SHA1 collisions, HMAC timing leaks, birthday attacks, or hash-based proof of work in CTF and authorized testing scenarios.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/heap-exploitation/SKILL.md
Heap exploitation playbook. Use when targeting ptmalloc2/glibc heap vulnerabilities including UAF, double free, overflow, off-by-one/null, and leveraging tcache/fastbin/unsortedbin attacks for arbitrary write or code execution.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/http2-specific-attacks/SKILL.md
HTTP/2 protocol-specific attack playbook. Use when the target supports HTTP/2 and you need to exploit binary framing, HPACK compression, h2c upgrade smuggling, pseudo-header injection, stream multiplexing abuse, or H2→H1 downgrade translation flaws.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/http-host-header-attacks/SKILL.md
HTTP Host header injection and routing abuse playbook. Use when the application trusts the Host header for generating URLs, routing requests, or access control — enabling password reset poisoning, web cache poisoning, SSRF via routing, and virtual host bypass.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/http-parameter-pollution/SKILL.md
HTTP Parameter Pollution (HPP): duplicate query/body keys parsed differently by servers, proxies, WAFs, and app frameworks. Use when filters and application layers disagree on which value wins, enabling bypass, SSRF second URL, logic abuse, or CSRF token confusion.
3 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/idor-broken-object-authorization/SKILL.md
IDOR and broken object authorization testing playbook. Use when requests expose object identifiers, tenant boundaries, writable fields, or missing object-level authorization checks.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/injection-checking/SKILL.md
Entry P1 category router for injection testing. Use when routing between XSS, SQLi, SSRF, XXE, SSTI, command injection, and NoSQL injection workflows based on how attacker-controlled input is consumed.
2 projects use a version of this
yaklangReads credentialsSkillyaklang/hack-skills/skills/insecure-source-code-management/SKILL.md
Source control and artifact exposure (.git, .svn, .hg, backups, .env). Use when recon finds VCS paths, 403 on hidden dirs, or backup/config leaks during authorized testing.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/ios-pentesting-tricks/SKILL.md
iOS pentesting playbook. Use when testing iOS applications for keychain extraction, URL scheme hijacking, Universal Links exploitation, runtime manipulation, binary protection analysis, data storage issues, and transport security bypass during authorized mobile security assessments.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/jndi-injection/SKILL.md
JNDI injection playbook. Use when Java applications perform JNDI lookups with attacker-controlled names, especially via Log4j2, Spring, or any code path reaching InitialContext.lookup().
3 projects use a version of this
yaklangReads credentialsSkillyaklang/hack-skills/skills/jwt-oauth-token-attacks/SKILL.md
JWT and OAuth token attack playbook. Use when validating token trust, signing algorithms, key handling, claim abuse, bearer flows, and OAuth account-binding weaknesses.
2 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/kernel-exploitation/SKILL.md
Linux kernel exploitation playbook. Use when exploiting kernel vulnerabilities (UAF, OOB, race condition, type confusion) for privilege escalation via commit_creds, modprobe_path overwrite, or kernel ROP chains in CTF and real-world scenarios.
3 projects use a version of this
yaklangSkillyaklang/hack-skills/skills/kubernetes-pentesting/SKILL.md
Kubernetes penetration testing playbook. Use when targeting Kubernetes clusters via API server, RBAC enumeration, service account abuse, etcd access, Kubelet API, pod escape, cloud-specific metadata, admission webhook bypass, and registry secrets.
2 projects use a version of this
Plain text files in a repository that tell a coding agent how the project works: commands to run, conventions to follow and things to avoid. CLAUDE.md, AGENTS.md, cursor rules and skills are the common kinds.
CLAUDE.md is read by Claude Code. AGENTS.md is an open format that Codex, Cursor and other agents read. Many projects keep one and point the other at it.
A folder with a SKILL.md that describes one capability, such as filling PDFs or reviewing code. The agent loads it only when the task calls for it.
Your agents already can, over MCP, limited to the files you're allowed to read. Searching them from this page is coming.
