Opera cannot properly restrict modifications to cookies established in HTTPS sessions, which allows man-in-the-middle attackers to overwrite or delete arbitrary cookies via a Set-Cookie header in an HTTP response, related to lack of the HTTP Strict Transport Security (HSTS) includeSubDomains feature, aka a cookie forcing issue.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Opera_browser | Opera | * | * |