What’s Vulnerable › Vulnerabilities

CVE-2023-25734

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-06-02 · updated 2026-10-24
• Weakness: CWE-601

Description

After downloading a Windows <code>.url</code> shortcut from the local filesystem, an attacker could supply a remote path that would lead to unexpected network requests from the operating system. This also had the potential to leak NTLM credentials to the resource.<br>*This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.

Affected products

• Mozilla Firefox: before 110.0 — fixed in 110.0
• Mozilla Firefox ESR: before 102.8 — fixed in 102.8
• Mozilla Thunderbird: before 102.8 — fixed in 102.8

How to fix

Upgrade to a fixed version: Mozilla Firefox 110.0; Mozilla Firefox ESR 102.8; Mozilla Thunderbird 102.8. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1784451
• https://bugzilla.mozilla.org/show_bug.cgi?id=1809923
• https://bugzilla.mozilla.org/show_bug.cgi?id=1810143
• https://bugzilla.mozilla.org/show_bug.cgi?id=1812338
• https://www.mozilla.org/security/advisories/mfsa2023-05/
• https://www.mozilla.org/security/advisories/mfsa2023-06/
• https://www.mozilla.org/security/advisories/mfsa2023-07/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1784451
• https://bugzilla.mozilla.org/show_bug.cgi?id=1809923
• https://bugzilla.mozilla.org/show_bug.cgi?id=1810143
• https://bugzilla.mozilla.org/show_bug.cgi?id=1812338
• https://www.mozilla.org/security/advisories/mfsa2023-05/

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