CVE-2022-26386

Name: CVE-2022-26386
Creator: NVD / NIST
Published: 2022-12-22T20:15:22.137+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.68%

Last modified Jun 17, 2026

CVE-2022-26386 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.68% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS Probability

0.68%

47.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-377

Affected Software

Vendor	Product	Versions
Mozilla	Firefox Esr	< 91.7
Mozilla	Thunderbird	< 91.7

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1752396Exploit, Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-11/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-12/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1752396Exploit, Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-11/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-12/Vendor Advisory

Timeline

Published: Dec 22, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-26386?

How severe is CVE-2022-26386?

CVE-2022-26386 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.68% probability of exploitation in the next 30 days.

How do I fix CVE-2022-26386?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-26386?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST