Vulnerability Monitor

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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.

Published

2020-12-09T01:15:12.643

Last Modified

2024-11-21T05:20:33.943

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.1 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:P/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Primary
CWE-79

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	mozilla	firefox	< 83.0	Yes
Application	mozilla	firefox_esr	< 78.5	Yes
Application	mozilla	thunderbird	< 78.5	Yes

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1667113 Issue Tracking, Permissions Required, Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2020-50/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2020-51/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2020-52/ Vendor Advisory ([email protected])
https://bugzilla.mozilla.org/show_bug.cgi?id=1667113 Issue Tracking, Permissions Required, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.mozilla.org/security/advisories/mfsa2020-50/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.mozilla.org/security/advisories/mfsa2020-51/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.mozilla.org/security/advisories/mfsa2020-52/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)