CVE-2023-4051: Mozilla Firefox · Vulnerability
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited : upgrade to 116 or 115.2 when convenient.
Data as of 26 Oct 2026, 06:26 UTC
Rated Medium by the CNA (mozilla) · No CVSS score from NVD or the CNA
- EPSS
- 0.6% chance of exploitation in 30 days – higher than 51% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 116, 115.2
Exploitation evidence
Disclosed: evidence found.
CVE published 1 Aug 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.
What to do
Upgrade Mozilla Firefox to 116 or 115.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Firefox | Affected
| Fixed in
|
AI-suggested
A fix for this vulnerability is available in Firefox 116 and Firefox ESR 115.2. Users and administrators should update to these versions or later to mitigate the risk. No additional mitigation steps are indicated by the vendor advisory.
Description
CVE-2023-4051 is a vulnerability in Mozilla Firefox versions prior to 116 and Firefox ESR versions prior to 115.2. It involves a scenario where a website could obscure the full screen notification by using the file open dialog, potentially causing user confusion and enabling spoofing attacks. This vulnerability has been fixed in Firefox 116 and Firefox ESR 115.2.