Access Control & IDOR — The #1 Bug Class

IDOR and Improper Access Control: the bugs that dominate bounty reports in 2026. Ordered from low-hanging fruit (Easy) to large-scale exploitation (Hard) with WAF bypass and PII exfiltration.

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Improper Access Control in `fizzy.do` import flow allows cross-tenant ActionText reference resolution and data disclosure

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IDOR Leading to Plaintext SFTP Credential Disclosure and Unauthorized SFTP Access

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Scaling IDOR: Automated PII Exfiltration via Notification Configuration Endpoints

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2 IDOR’s & WAF Bypass to Expose Full Event Database

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[Vertical Privilege Escalation] User can Unapproved any Approved Translation at [/translations/unapprove/]

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IDOR leads Unauthorized Staff Member Removal via Insufficient Authorization Checks

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Unauthenticated access to private files on app.fizzy.do via Active Storage URLs leads to information disclosure

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Disclose Hidden Comments on Media Section of hub.vroid.com

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[Privilege Escalation] User can Pin|Unpin Any Comment on Any Project or Locale

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Users can change project visibility which requires high subscription by just changing request body

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Easy way to create a new Deck board without permission

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Can download files on Android app without permission

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Lack of Validation in Reward Redemption Allows Unlimited Burp Suite License Abuse

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LogicalBreach Academy

Access Control & IDOR — The #1 Bug Class

Improper Access Control in `fizzy.do` import flow allows cross-tenant ActionText reference resolution and data disclosure

IDOR Leading to Plaintext SFTP Credential Disclosure and Unauthorized SFTP Access

Scaling IDOR: Automated PII Exfiltration via Notification Configuration Endpoints

2 IDOR’s & WAF Bypass to Expose Full Event Database

[Vertical Privilege Escalation] User can Unapproved any Approved Translation at [/translations/unapprove/]

IDOR leads Unauthorized Staff Member Removal via Insufficient Authorization Checks

Unauthenticated access to private files on app.fizzy.do via Active Storage URLs leads to information disclosure

Disclose Hidden Comments on Media Section of hub.vroid.com

[Privilege Escalation] User can Pin|Unpin Any Comment on Any Project or Locale

Users can change project visibility which requires high subscription by just changing request body

Easy way to create a new Deck board without permission

Can download files on Android app without permission

Lack of Validation in Reward Redemption Allows Unlimited Burp Suite License Abuse

User Can Delete Other Users' Personal Access Tokens at /delete-token/{token_id}/ on Mozilla Pontoon