AppSec Glossary -- Security Term Reference

Quick-reference dictionary for security terms, acronyms, vulnerability classes, and framework categories. Returns concise definitions with cross-framework mappings and concrete examples.

Unlike /appsec:explain which provides deep educational content, glossary is a fast lookup -- a few sentences per term, not a full lesson.

This skill runs entirely in the main agent context. It does NOT dispatch subagents.

Supported Modes

Detect the user's intent from their message:

Intent	Mode
Single term ("what is IDOR", "define XSS")	Single Term Lookup
Comparison ("CSRF vs SSRF", "XSS vs injection")	Term Comparison
"security glossary", "list all terms"	Full Glossary

Single Term Lookup

For a single term, output:

<TERM> (<full expansion if acronym>)

Definition: <2-3 sentence plain-language definition>

Framework Mappings:
  OWASP:   <category, e.g., A03:2021 Injection>
  STRIDE:  <letter(s), e.g., T (Tampering)>
  CWE:     <CWE-ID, e.g., CWE-89>
  MITRE:   <technique, e.g., T1190>

Example: <1-2 sentence concrete attack scenario>

Related: <2-3 related terms>

Term Registry

Use these framework reference files to resolve mappings:

Framework	Reference
OWASP Top 10	`../../shared/frameworks/owasp-top10-2021.md`
OWASP API Top 10	`../../shared/frameworks/owasp-api-top10.md`
STRIDE	`../../shared/frameworks/stride.md`
PASTA	`../../shared/frameworks/pasta.md`
LINDDUN	`../../shared/frameworks/linddun.md`
MITRE ATT&CK	`../../shared/frameworks/mitre-attck.md`
SANS/CWE Top 25	`../../shared/frameworks/sans-cwe-top25.md`
DREAD	`../../shared/frameworks/dread.md`

Read the relevant reference file(s) to populate the mappings accurately. Do NOT guess mappings -- if a term does not appear in a framework, omit that mapping rather than fabricating one.

Common Terms

This is not exhaustive. Handle any security term the user asks about using general security knowledge plus the framework references above.

Vulnerability classes: IDOR, XSS, CSRF, SSRF, SQLi, RCE, LFI, RFI, XXE, SSTI, ReDoS, CRLF, HPP, clickjacking, open redirect, mass assignment, insecure deserialization, broken authentication, path traversal, command injection, log injection, race condition, TOCTOU, privilege escalation, session fixation, session hijacking, credential stuffing, brute force, directory traversal

Framework terms: OWASP, STRIDE, PASTA, LINDDUN, DREAD, CVSS, CWE, CVE, MITRE ATT&CK, SANS Top 25, NIST, ISO 27001, SOC 2, PCI DSS, GDPR, CCPA, HIPAA

Security concepts: defense in depth, least privilege, zero trust, separation of concerns, input validation, output encoding, parameterized queries, prepared statements, CSP, CORS, SOP, HSTS, certificate pinning, mTLS, JWT, OAuth, OIDC, SAML, RBAC, ABAC, ACL, MFA, 2FA, TOTP, FIDO2, WebAuthn, salted hash, key derivation, envelope encryption, secret rotation, audit trail

Term Comparison

When the user asks to compare two or more terms, output a side-by-side table:

<TERM_A> vs <TERM_B>

| Aspect      | <TERM_A>                | <TERM_B>                |
|-------------|-------------------------|-------------------------|
| Full Name   | ...                     | ...                     |
| What It Is  | ...                     | ...                     |
| Attack Type | ...                     | ...                     |
| Target      | ...                     | ...                     |
| OWASP       | ...                     | ...                     |
| CWE         | ...                     | ...                     |
| Example     | ...                     | ...                     |

Key Difference: <one sentence explaining the core distinction>

Full Glossary

When the user asks for a full glossary, output an alphabetically sorted table of the most important terms. Limit to 30-40 entries to keep it scannable. Group by category:

APPSEC GLOSSARY

--- Vulnerability Classes ---
| Term   | Definition (brief)              | OWASP  | CWE     |
|--------|---------------------------------|--------|---------|
| CSRF   | Cross-site request forgery ...  | A01    | CWE-352 |
| IDOR   | Insecure direct object ref ...  | A01    | CWE-639 |
| ...    | ...                             | ...    | ...     |

--- Frameworks & Standards ---
| Term       | What It Is                           |
|------------|--------------------------------------|
| OWASP      | Open Worldwide Application Security  |
| STRIDE     | Threat modeling framework (6 cats)   |
| ...        | ...                                  |

--- Security Concepts ---
| Term              | Definition (brief)                     |
|-------------------|----------------------------------------|
| Defense in Depth  | Multiple layers of security controls   |
| Least Privilege   | Minimum necessary access               |
| ...               | ...                                    |

Presentation Rules

Keep definitions SHORT. This is a glossary, not an encyclopedia. Two to three sentences maximum per definition.
Always include at least one framework mapping when one exists.
Always include a concrete example -- "An attacker can..." not abstract descriptions.
For acronyms, always expand them on first use.
If the user asks about a term not in the registry, provide a definition from general security knowledge and note which frameworks it relates to.
After any lookup, offer: "Want to learn more? Try /appsec:explain <term> for an in-depth walkthrough."