CVE-2021-23956

Public Exploit

Description

An ambiguous file picker design could have confused users who intended to select and upload a single file into uploading a whole directory. This was addressed by adding a new prompt. This vulnerability affects Firefox < 85.

6.5

CVSS

Severity: Medium

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.28%

Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Firefox

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2021-03/	release notes vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1338637	issue tracking patch vendor advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-23956?: CVE-2021-23956 has been scored as a medium severity vulnerability.
How to fix CVE-2021-23956?: To fix CVE-2021-23956, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-23956 being actively exploited in the wild?: It is possible that CVE-2021-23956 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-23956?: CVE-2021-23956 affects Mozilla Firefox.

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