Bug bounty reports15,219
Publicly disclosed HackerOne reports, with the platform's own outcome and severity.
| Report | Status | Weakness | Severity | Disclosed | Bounty | Votes |
|---|---|---|---|---|---|---|
| Private circle can be added to another circle via API despite visibility restrictionAnalysed#3511998 | Valid | Insecure Direct Object Reference | Low | 2026-05-08 | $150 | 87 |
| WebAuthn app was updated based on public keyAnalysed#3360354 | Valid | Insecure Direct Object Reference | Low | 2026-02-06 | – | 84 |
| Files drop share links for end-to-end encrypted folders allowed to drop files into other folders of the share ownerAnalysed#3304830 | Valid | Insecure Direct Object Reference | Low | 2026-05-08 | – | 60 |
| Calendar app allowed booking appointments without the generated tokenAnalysed#3275810 | Valid | Insecure Direct Object Reference | Low | 2025-12-05 | – | 57 |
| Ability to read any emails through IDOR on Nextcloud MailAnalysed#1784681 | Valid | Insecure Direct Object Reference | Medium | 2023-04-12 | – | 34 |
| Share information of Tables app is not limited to affected usersAnalysed#2705507 | Valid | Insecure Direct Object Reference | Low | 2024-11-18 | – | 31 |
Status and severity are HackerOne's. “Access stated” is what the title says; “Access needed” and techniques come from CyberSIXT's analysis of the public report, where there is one, which can be wrong. Data as of 2026-11-15.