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CVE-2020-26951

Mozilla: Parsing mismatches could confuse and bypass security sanitizer for chrome privileged code

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Severity

Important

Red Hat Product Security

6.1

CVSS 3.1

Review impact separately from score.

Published · November 17, 2020

Updated · November 22, 2025

Description

A parsing and event loading mismatch in Firefox's SVG code could have allowed load events to fire, even after sanitization. An attacker already capable of exploiting an XSS vulnerability in privileged internal pages could have used this attack to bypass our built-in sanitizer. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

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 · 6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE-354 · Improper Validation of Integrity Check Value