Remember IDOR
Full name: Insecure Direct Object Reference
Memory aid: An ID Opens a Resource without permission as a cue.
Hard-to-guess identifiers do not replace per-object authorization.
Study area: Threats & application security · Batch 8
Relevant study for: CompTIA Security+ SY0-701 · ISC2 CISSP 2024 outline · CompTIA CySA+ · CompTIA PenTest+
Practice with exam flashcards →Cybersecurity & Identity / Knowledge library
IDOR — Insecure Direct Object Reference
Exposes objects through identifiers without appropriate authorization checks.
Why learn IDOR — Insecure Direct Object Reference?
Exposes objects through identifiers without appropriate authorization checks.
Where it came from
Hard-to-guess identifiers do not replace per-object authorization.
- Memory aid (a learning cue, not the expansion): An ID Opens a Resource without permission as a cue.
Build your understanding
Work through these exercises in order. Try the task before opening a reference.
- Without looking, expand IDOR: Insecure Direct Object Reference.
- Recall this memory aid: An ID Opens a Resource without permission as a cue.
- Explain the practical use: Exposes objects through identifiers without appropriate authorization checks.
- Explain this distinction: Hard-to-guess identifiers do not replace per-object authorization.
- Identify IDOR in a device specification, architecture diagram, or system inventory.
Documentation and sources
- OWASP application security cheat sheets (cheatsheetseries.owasp.org)