Bug bounty reports15,219
Publicly disclosed HackerOne reports, with the platform's own outcome and severity.
| Report | Status | Weakness | Severity | Disclosed | Bounty | Votes |
|---|---|---|---|---|---|---|
| Code injection possible with malformed Nextcloud Talk chat commandsAnalysed#851807 | Valid | Command and Code Injection | High | 2020-06-02 | – | 317 |
| Attacker can obtain write access to any federated share/public linkAnalysed#1170024 | Valid | Authentication | High | 2021-06-10 | $4,000 | 142 |
| Missing ownership check on remote wipe endpointAnalysed#819807 | Valid | Insecure Direct Object Reference | High | 2020-04-19 | $500 | 141 |
| Remote Code Execution via Extract App PluginAnalysed#546753 | Valid | Command and Code Injection | High | 2019-05-30 | – | 124 |
| Two-factor authentication enforcement bypassAnalysed#1050244 | Valid | No weakness recorded | High | 2021-07-31 | $750 | 64 |
| Basic auth header on WebDAV requests is not bruteforce protectedAnalysed#1879549 | Valid | Authentication | High | 2023-06-02 | – | 53 |
| Delete external storage of any userAnalysed#2212627 | Valid | Access Control | High | 2023-11-21 | – | 45 |
| End-to-end encrypted file-drops can be made inaccessibleAnalysed#1914115 | Valid | Access Control | High | 2023-06-22 | $400 | 43 |
| Remote code execution via path traversal in Zip extraction in the Extract appAnalysed#765291 | Valid | File and Path Handling | High | 2020-03-07 | – | 40 |
| Scoped apptokens can be changed by that very apptokenAnalysed#1193321 | Valid | Access Control | High | 2021-07-15 | $1,000 | 39 |
| Group admins can remove arbitrary data from "data" directory (including admin data)Analysed#508493 | Valid | Access Control | High | 2019-08-12 | – | 32 |
| bypass of 2FAAnalysed#248656 | Valid | Authentication | High | 2018-07-29 | $750 | 20 |
| Missing server side controls when editing the board’s sharing permissions per userAnalysed#827816 | Valid | Access Control | High | 2020-09-28 | – | 16 |
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.