CVEvulnerability
CVE-2020-26951
6.1 MEDIUM
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- Status
- Modified
- Published
- 2020-12-09
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.1 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CVSS 2.0 ([email protected])
- 4.3 MEDIUM — AV:N/AC:M/Au:N/C:N/I:P/A:N
- Weaknesses
- CWE-79
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.
Affected configurations
• mozilla firefox (< 83.0)
• mozilla firefox esr (< 78.5)
• mozilla thunderbird (< 78.5)
Related
Weakness · CWE (1)
- CWE-79 Improper Neutralization of Input During Web Page Generation weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1667113 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-50/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-51/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-52/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1667113 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-50/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-51/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-52/ Vendor Advisory