What’s Vulnerable › Vulnerabilities

CVE-2020-15652

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-08-10 · updated 2026-06-17
• Weakness: CWE-346

Description

By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a cross-origin redirect. This applied only to content that can be parsed as script. This vulnerability affects Firefox < 79, Firefox ESR < 68.11, Firefox ESR < 78.1, Thunderbird < 68.11, and Thunderbird < 78.1.

Affected products

• Canonical Ubuntu Linux: 16.04, 18.04, 20.04
• Mozilla Firefox: before 79.0; from 78.0 before 78.1 — fixed in 78.1, 79.0
• Mozilla Firefox ESR: before 68.11 — fixed in 68.11
• Mozilla Thunderbird: before 68.11; from 78.0 before 78.1 — fixed in 68.11, 78.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 78.1, 79.0; Mozilla Firefox ESR 68.11; Mozilla Thunderbird 68.11, 78.1. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00022.html
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.html
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00032.html
• https://bugzilla.mozilla.org/show_bug.cgi?id=1634872
• https://usn.ubuntu.com/4443-1/
• https://www.mozilla.org/security/advisories/mfsa2020-30/
• https://www.mozilla.org/security/advisories/mfsa2020-31/
• https://www.mozilla.org/security/advisories/mfsa2020-32/
• https://www.mozilla.org/security/advisories/mfsa2020-33/
• https://www.mozilla.org/security/advisories/mfsa2020-35/
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00022.html
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.html

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