Vulnerability Monitor

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CVE-2020-26956

In some cases, removing HTML elements during sanitization would keep existing SVG event handlers and therefore lead to XSS. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

Published

2020-12-09T01:15:12.957

Last Modified

2024-11-21T05:20:34.537

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=1666300 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=1666300 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)