CVE-2020-15655

Mozilla: Extension APIs could be used to bypass Same-Origin Policy

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Severity

Important

Red Hat Product Security

6.5

CVSS 3.1

Review impact separately from score.

Published · July 28, 2020

Updated · November 22, 2025

Description

A redirected HTTP request which is observed or modified through a web extension could bypass existing CORS checks, leading to potential disclosure of cross-origin information. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

CWE-829 · Inclusion of Functionality from Untrusted Control Sphere