What’s Vulnerable › Vulnerabilities

CVE-2020-15682

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-22 · updated 2026-06-17
• Weakness: CWE-346

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 products

• Mozilla Firefox: before 82.0 — fixed in 82.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 82.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1636654
• https://www.mozilla.org/security/advisories/mfsa2020-45/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1636654
• https://www.mozilla.org/security/advisories/mfsa2020-45/

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