Vulnerability Details : CVE-2020-26951
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.
Vulnerability category: Cross site scripting (XSS)
Exploit prediction scoring system (EPSS) score for CVE-2020-26951
Probability of exploitation activity in the next 30 days: 0.09%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 35 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2020-26951
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST |
|
6.1
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
2.8
|
2.7
|
NIST |
CWE ids for CVE-2020-26951
-
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-26951
-
https://www.mozilla.org/security/advisories/mfsa2020-52/
Vendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2020-51/
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
Products affected by CVE-2020-26951
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*