What’s Vulnerable › Vulnerabilities

CVE-2023-37207

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-07-05 · updated 2026-10-23
• Weakness: CWE-470

Description

A website could have obscured the fullscreen notification by using a URL with a scheme handled by an external program, such as a mailto URL. This could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 115, Firefox ESR < 102.13, and Thunderbird < 102.13.

Affected products

• Debian Linux: 10.0, 11.0, 12.0
• Mozilla Firefox: before 115.0 — fixed in 115.0
• Mozilla Firefox ESR: before 102.13 — fixed in 102.13
• Mozilla Thunderbird: before 102.13 — fixed in 102.13

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.0; Mozilla Firefox ESR 102.13; Mozilla Thunderbird 102.13. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1816287
• https://lists.debian.org/debian-lts-announce/2023/07/msg00006.html
• https://lists.debian.org/debian-lts-announce/2023/07/msg00015.html
• https://www.debian.org/security/2023/dsa-5450
• https://www.debian.org/security/2023/dsa-5451
• https://www.mozilla.org/security/advisories/mfsa2023-22/
• https://www.mozilla.org/security/advisories/mfsa2023-23/
• https://www.mozilla.org/security/advisories/mfsa2023-24/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1816287
• https://lists.debian.org/debian-lts-announce/2023/07/msg00006.html
• https://lists.debian.org/debian-lts-announce/2023/07/msg00015.html
• https://www.debian.org/security/2023/dsa-5450

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