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CVE-2020-15676

MEDIUM
6.1
CVSS Score
Published: October 1, 2020 at 06:31 PM UTC
Updated: June 17, 2026 at 02:57 AM UTC
5 products affected across 3 vendorsDebian LinuxFirefoxThunderbird

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Severity
MEDIUM6.1
Exploit prediction
EPSS 2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.09.0
Firefox· Mozilla
95%
v < 81
Affected range stops below 81, so it looks safe — our inference, not a vendor statement
Affected range stops below 81.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 78.3
Affected range stops below 78.3, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 78.3
Affected range stops below 78.3, so it looks safe — our inference, not a vendor statement
Leap· openSUSEdrupal
95%
15.115.2

References (9)

Vendor Advisoryx_refsource_SUSEBroken LinkMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00074.html
Vendor Advisoryx_refsource_SUSEBroken LinkMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00077.html
x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1646140
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/10/msg00020.html
Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202010-02
Vendor Advisoryx_refsource_DEBIANThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2020/dsa-4770
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-42/
x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2020-43/

CVSS

6.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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