Collected research

XSS to RCE in the Opera Browser

$8,000 Bug Bounty Highlight: XSS to RCE in the Opera Browser

Renwa · Opera Security · 24 September 2021

Opera's My Flow page assigned dropped drag-and-drop HTML data to innerHTML, giving script execution on a page privileged to message a hidden Opera Touch Background extension. Its SEND_FILE and OPEN_FILE calls write an arbitrary file to the user's Downloads folder and then open it, turning a single drag gesture into remote code execution.

Record

Document

$8,000 Bug Bounty Highlight: XSS to RCE in the Opera Browser

Researcher

Renwa

Published by

Opera Security

Date

24 September 2021

Topic

XSS

In the archive

• Collected in the 2021 research round

Tags

• xss
• rce
• browser-extension
• privilege-escalation
• attack-chain
• postmessage
• dom
• bug-bounty
• owasp-a01-2021
• owasp-a03-2021

This page is the archive's own catalogue record. The research is the work of Renwa, first published at the original source. Preserved copies are kept so the citation survives its host; this one was last captured on 16 August 2026.