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 handler. This allowed an attacker to successfully probe whether an external protocol handler was registered. This vulnerability affects Firefox < 82.

• https://bugzilla.mozilla.org/show_bug.cgi?id=1658881Issue Tracking, Permissions Required, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-45/Release Notes, Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1658881Issue Tracking, Permissions Required, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2020-45/Release Notes, Vendor Advisory

Published

Oct 22, 2020

Last Modified

Jun 17, 2026

Status

Modified

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