CVE-2020-15680
If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol h…
Published: 2020-10-22 · CVSS: Unscored
If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol handler. This allowed an attacker to successfully probe whether an external protocol handler was registered. This vulnerability affects Firefox < 82.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7