Description
Firefox sometimes ran the onload handler for SVG elements that the DOM sanitizer decided to remove, resulting in JavaScript being executed after pasting attacker-controlled data into a contenteditable element. This vulnerability affects Firefox < 81, Thunderbird < 78.3, and Firefox ESR < 78.3.
Metrics
CVSS 3.1 6.1/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | >= unspecified, < 81 |
| Mozilla | Thunderbird | >= unspecified, < 78.3 |
| Mozilla | Firefox ESR | >= unspecified, < 78.3 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.htmlBroken Link, Mailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.htmlBroken Link, Mailing List, Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1646140Issue Tracking, Permissions Required, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/10/msg00020.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202010-02Third Party Advisory
- https://www.debian.org/security/2020/dsa-4770Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-42/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-43/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-44/Release Notes, Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.htmlBroken Link, Mailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.htmlBroken Link, Mailing List, Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1646140Issue Tracking, Permissions Required, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/10/msg00020.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202010-02Third Party Advisory
- https://www.debian.org/security/2020/dsa-4770Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-42/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-43/Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-44/Release Notes, Vendor Advisory
Timeline
- Published
- Oct 1, 2020
- Last modified
- Jun 17, 2026
- NVD status
- Modified