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Get User A's resource ID while authenticated as A · elementalsouls | DecimalAI

securityby elementalsouls

Get User A's resource ID while authenticated as A

elementalsouls/hunt-idor

Source elementalsouls/claude-bughunter ↗License NOASSERTION

Hunting skill for idor vulnerabilities. Built from 26 public bug bounty reports.

SkillScore86Maintained

Automatic

Security & AppSec pack

Last verified 8/9/2026

What it changes

Passed 18 of 21 test cases with the skill, and 16 of 21 without it.

Without skill77%

With skill86%

Checks it passed that the model alone missed

Searches for request.args.get('id') within Python files
Determines specific attacker actions, victim CIA triad loss, and 10-minute reproducibility
Injects script payloads into the filename parameter of the Content-Disposition response header

3 fixed16 passed either way2 still failing1 broke

Pass-rate lift: +9 pp
Tokens: +257%
Agent turns: 0%
Response time: -19%

Model gemini-3.6-flashMeasured 8/9/2026v119 of 22 cases passed with skill · 21 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/elementalsouls-hunt-idor/SKILL.md https://app.decimal.ai/s/elementalsouls-hunt-idor/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add elementalsouls-hunt-idor, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/elementalsouls-hunt-idor/ and pins it in .decimal/skills.lock

decimalai skills add elementalsouls-hunt-idor

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/elementalsouls-hunt-idor/SKILL.md https://app.decimal.ai/s/elementalsouls-hunt-idor/SKILL.md

Raw file: /s/elementalsouls-hunt-idor/SKILL.md ↗ · machine-readable summary at /s/elementalsouls-hunt-idor.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 2 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 2

Prompt

Before confirming that a direct object reference vulnerability is triaged as valid, what three essential questions must be positively answered according to standard vulnerability gate validation?

What was checked, without and with the skill
Checked	Without skill	With skill
Determines specific attacker actions, victim CIA triad loss, and 10-minute reproducibility	Missed	Passed

case-19 · gemini-3.6-flash · 8/9/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md382 linessingle file

Crown Jewel Targets

Why IDOR pays big:

Direct access to other users' data without authentication bypass — clear, demonstrable impact
Chains easily with privilege escalation, financial fraud, and account takeover
Affects virtually every application with user-owned resources

Highest-value asset types (by payout potential):

Asset Type	Why It Pays
Financial documents / billing APIs	PII + financial data exposure (Shopify, Uber, PayPal)
Private repositories / source code	IP theft, critical data loss (GitHub)
User messages / DMs	Privacy violation at scale (Reddit)
Account management endpoints	User addition, deletion, privilege escalation (PayPal, Mozilla)
Business/org administration	Cross-tenant escalation, employee PII (Uber)
Content moderation/admin actions	Operational sabotage (Reddit mod logs)

Programs that pay most for IDOR:

Platforms with multi-tenancy (SaaS, B2B tools)
Fintech and payment processors
Social platforms with private content
Developer tools with org/repo isolation

Attack Surface Signals

URL patterns that scream IDOR:

/api/v1/users/{id}/
/api/v*/orders/{order_id}
/invoices/download?id=
/reports/{uuid}/
/messages/{thread_id}
/admin/orgs/{org_id}/members
/migration/{migration_id}/files
/graphql (query params with IDs)
/api/business/{business_id}/
/vouchers/{voucher_id}/policy

Track record

Benchmark

18 / 21

test cases passed, vs 16 / 21 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

elementalsouls / claude-bughunter

skills/hunt-idor/SKILL.md

View on GitHub ↗

License NOASSERTIONImported 9/1/2026Version v1

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