CVE-2020-15682

MEDIUM
6.5
CVSS Score
Published: October 22, 2020 at 08:32 PM UTC
Updated: June 17, 2026 at 02:57 AM UTC
1 product affected across 1 vendorFirefox

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.5%

Description

When a link to an external protocol was clicked, a prompt was presented that allowed the user to choose what application to open it in. An attacker could induce that prompt to be associated with an origin they didn't control, resulting in a spoofing attack. This was fixed by changing external protocol prompts to be tab-modal while also ensuring they could not be incorrectly associated with a different origin. This vulnerability affects Firefox < 82.

Affected

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

v < 82
Affected range stops below 82, so it looks safe — our inference, not a vendor statement
Affected range stops below 82.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (2)

x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1636654
x_refsource_MISCRelease NotesVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-45/

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-346

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