What’s Vulnerable › Vulnerabilities

CVE-2022-26386

• 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: yes
• Published: 2022-12-22 · updated 2026-06-17
• Weakness: CWE-377

Description

Previously Firefox for macOS and Linux would download temporary files to a user-specific directory in <code>/tmp</code>, but this behavior was changed to download them to <code>/tmp</code> where they could be affected by other local users. This behavior was reverted to the original, user-specific directory. <br>*This bug only affects Firefox for macOS and Linux. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 91.7 and Thunderbird < 91.7.

Affected products

• Mozilla Firefox ESR: before 91.7 — fixed in 91.7
• Mozilla Thunderbird: before 91.7 — fixed in 91.7

How to fix

Upgrade to a fixed version: Mozilla Firefox ESR 91.7; Mozilla Thunderbird 91.7. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1752396
• https://www.mozilla.org/security/advisories/mfsa2022-11/
• https://www.mozilla.org/security/advisories/mfsa2022-12/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1752396
• https://www.mozilla.org/security/advisories/mfsa2022-11/
• https://www.mozilla.org/security/advisories/mfsa2022-12/

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