Advisory Published
CVE Published
Updated

CVE-2020-15655

First published: Tue Jul 28 2020(Updated: )

A redirected HTTP request which is observed or modified through a web extension could bypass existing CORS checks, leading to potential disclosure of cross-origin information. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.

Credit: security@mozilla.org security@mozilla.org

Affected SoftwareAffected VersionHow to fix
Mozilla Firefox ESR<78.1
78.1
Mozilla Thunderbird<78.1
78.1
Mozilla Firefox<79
79
Mozilla Firefox<79.0
Mozilla Firefox ESR<78.1
Mozilla Thunderbird<78.1
openSUSE Leap=15.2
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=20.04
debian/firefox
132.0-1
debian/thunderbird
1:115.12.0-1~deb11u1
1:115.16.0esr-1~deb11u1
1:115.12.0-1~deb12u1
1:115.16.0esr-1~deb12u1
1:128.3.2esr-1
1:128.4.0esr-1

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Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the vulnerability ID for this vulnerability?

    The vulnerability ID for this vulnerability is CVE-2020-15655.

  • Who discovered this vulnerability?

    Mozilla Developer Rob Wu discovered this vulnerability.

  • What is the impact of this vulnerability?

    This vulnerability could bypass existing CORS checks, leading to potential disclosure of cross-origin information.

  • Which software products are affected by this vulnerability?

    Firefox ESR 78.1, Thunderbird 78.1, and Firefox 79 are affected by this vulnerability.

  • What is the severity of CVE-2020-15655?

    The severity of CVE-2020-15655 is high (7.0).

  • How can I fix this vulnerability?

    Update Firefox ESR to version 78.1, Thunderbird to version 78.1, or Firefox to version 79 to fix this vulnerability.

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