CVE-2021-23958 Information disclosure in Firefox
An attacker could trick Firefox into leaking screen sharing state to another tab, exposing unintended information to users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-23958?
CVE-2021-23958 is a medium-severity vulnerability in Mozilla Firefox, published on 26 Feb 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The browser could have been confused into transferring a screen sharing state into another tab, which would leak unintended information. This vulnerability affects Firefox < 85.
Weakness: CWE-668
Which versions are affected by CVE-2021-23958?
It affects 1 product.
Products include Mozilla Firefox.
How do I fix CVE-2021-23958?
Upgrade to a fixed version.
Is CVE-2021-23958 being exploited?
There is no known exploitation of CVE-2021-23958 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as GHSA-h8m9-2c4v-j2jx, UBUNTU-CVE-2021-23958.