Bug bounty reports15,219
Publicly disclosed HackerOne reports, with the platform's own outcome and severity.
| Report | Status | Weakness | Severity | Disclosed | Bounty | Votes |
|---|---|---|---|---|---|---|
| Facebook Takeover using Slack using 302 from files.slack.com with access_tokenAnalysed#6017 | Valid | Open Redirect | – | 2015-01-11 | – | 17 |
| Stored XSS in Slack.com#6002 | Valid | Cross-site Scripting | – | 2015-03-09 | – | 5 |
| Stored XSS in Slack (weird, trial and error)#96337 | Valid | Cross-site Scripting | – | 2015-11-10 | – | 4 |
| Reflective XSS can be triggered in IE#2497 | Valid | Cross-site Scripting | – | 2015-03-15 | $150 | 4 |
| Team admin can add billing contacts#47940 | Valid | Access Control | – | 2015-04-03 | $200 | 3 |
| Team admin can change unauthorized team setting (allow_message_deletion)#46750 | Valid | Access Control | – | 2015-05-30 | $100 | 3 |
| Team admin can change unauthorized team setting (require_at_for_mention)#46747 | Valid | Access Control | – | 2015-04-30 | $200 | 3 |
| Reflected Self-XSS in Slack#97683 | Valid | Cross-site Scripting | – | 2015-11-10 | – | 2 |
| Self-XSS in posts by formatting text as code#89505 | Valid | Cross-site Scripting | – | 2015-11-10 | – | 2 |
| Logout any user of same team#54610 | Valid | Cross-Site Request Forgery | – | 2015-05-05 | – | 2 |
| File upload XSS (Java applet) on http://slackatwork.com/#97657 | Valid | Command and Code Injection | – | 2015-11-11 | $200 | 1 |
| Link vulnerability leads to phishing attacks#66994 | Informative | No weakness recorded | – | 2015-07-13 | – | 1 |
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.