CVE-2023-6206

Name: CVE-2023-6206
Creator: NVD / NIST
Published: 2023-11-21T15:15:07.787+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 0.56%

Last modified Jun 17, 2026

CVE-2023-6206 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. The black fade animation when exiting fullscreen is roughly the length of the anti-clickjacking delay on permission prompts. It was possible to use this fact to surprise users by luring them to click where the permission grant button would be about to appear. EPSS estimates a 0.56% chance of exploitation in the next 30 days.

Description

The black fade animation when exiting fullscreen is roughly the length of the anti-clickjacking delay on permission prompts. It was possible to use this fact to surprise users by luring them to click where the permission grant button would be about to appear. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

0.56%

42.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1021

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 120.0
Mozilla	Firefox Esr	< 115.5.0
Mozilla	Thunderbird	< 115.5
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0
Debian	Debian Linux	12.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1857430Issue Tracking, Permissions Required
https://lists.debian.org/debian-lts-announce/2023/11/msg00017.htmlMailing List
https://lists.debian.org/debian-lts-announce/2023/11/msg00030.html
https://www.debian.org/security/2023/dsa-5561Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2023-49/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-50/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-52/Release Notes, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1857430Issue Tracking, Permissions Required
https://lists.debian.org/debian-lts-announce/2023/11/msg00017.htmlMailing List
https://lists.debian.org/debian-lts-announce/2023/11/msg00030.html
https://www.debian.org/security/2023/dsa-5561Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2023-49/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-50/Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-52/Release Notes, Vendor Advisory

Timeline

Published: Nov 21, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-6206?

How severe is CVE-2023-6206?

CVE-2023-6206 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.

How do I fix CVE-2023-6206?

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-2023-6206?

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

Scan your code now

Source: NVD / NIST