Bug bounty reports15,219
Publicly disclosed HackerOne reports, with the platform's own outcome and severity.
| Report | Status | Weakness | Severity | Disclosed | Bounty | Votes |
|---|---|---|---|---|---|---|
| SSRF via User-Controlled Push proxyServer in Notifications Push Registration#3623149 | Valid | Server-Side Request Forgery | Medium | 2026-09-30 | – | 48 |
| DNS pin middleware can be tricked into DNS rebinding allowing SSRF#2115212 | Valid | Server-Side Request Forgery | Medium | 2024-01-01 | – | 38 |
| Blind SSRF in Mail App#1869714 | Valid | Server-Side Request Forgery | Low | 2024-01-10 | – | 37 |
| SSRF via filter bypass due to lax checking on IPs#1702864 | Valid | Server-Side Request Forgery | Medium | 2023-02-10 | $250 | 33 |
| SSRF via potential filter bypass with too lax local domain checking#1608039 | Valid | Server-Side Request Forgery | Low | 2022-09-16 | $250 | 30 |
| [nextcloud/mail] Blind SSRF to Internal Network via "List-Unsubscribe" SMTP Header when allow_local_remote_servers is allowed#2902856 | Informative | Server-Side Request Forgery | Medium | 2025-12-23 | – | 25 |
| SSRF protection bypass#736867 | Valid | Server-Side Request Forgery | Medium | 2020-03-14 | $100 | 18 |
| SSRF on Nextcloud Whiteboard Application via Recordings to Unauthorised Access to Whiteboards#3576823 | Valid | Server-Side Request Forgery | Medium | 2026-10-27 | $250 | 17 |
| Unauthenticated SSRF in 3rd party module "cerdic/csstidy"#1595006 | Valid | Server-Side Request Forgery | Medium | 2022-09-03 | $250 | 17 |
| Unauthenticated blind SSRF in Circles signature verification bypasses Nextcloud local-address protections#3303283 | Valid | Server-Side Request Forgery | Medium | 2026-09-17 | – | 15 |
| Responsive Server-side Request Forgery (SSRF)#1895874 | Valid | Server-Side Request Forgery | Medium | 2023-10-19 | – | 15 |
| Blind SSRF as normal user from mailapp#1913095 | Valid | Server-Side Request Forgery | Low | 2023-05-30 | – | 14 |
| Mail app - blind SSRF via imapHost parameter#1736390 | Valid | Server-Side Request Forgery | Low | 2023-02-06 | – | 13 |
| Mail app - blind SSRF via smtpHost parameter#1746582 | Valid | Server-Side Request Forgery | Low | 2023-02-06 | – | 11 |
| Mail app - Blind SSRF via Sierve server fonctionnality and sieveHost parameter#1741525 | Valid | Server-Side Request Forgery | Low | 2023-02-06 | – | 11 |
| Server-Side request forgery in New-Subscription feature of the calendar app#427835 | Valid | Server-Side Request Forgery | Medium | 2019-12-12 | $100 | 11 |
| SSRF on local storage of iOS mobile#746541 | Valid | Server-Side Request Forgery | Medium | 2020-03-01 | – | 7 |
| SSRF at apps.nextcloud.com/developer/apps/releases/new#213358 | Informative | Server-Side Request Forgery | – | 2017-04-20 | – | 4 |
| Possible SSRF in email server settings(SMTP mode)#222667 | Informative | Server-Side Request Forgery | Medium | 2017-05-15 | – | 2 |
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 (1,683 analysed so far), which can be wrong. Data as of 2026-11-15.