CVE-2023-4580: Mozilla Firefox · Vulnerability
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited : upgrade to 117 or 115.2 when convenient.
Data as of 25 Oct 2026, 21:28 UTC
Rated Medium by the CNA (mozilla) · No CVSS score from NVD or the CNA
- EPSS
- 0.4% chance of exploitation in 30 days – higher than 36% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 117, 115.2
Exploitation evidence
Disclosed: evidence found.
CVE published 11 Sep 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 2026-10-25.
What to do
Upgrade Mozilla Firefox to 117 or 115.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Firefox | Affected
| Fixed in
|
AI-suggested
Mozilla has released official fixes for this vulnerability in Firefox 117 and Firefox ESR 115.2. Users and administrators should update affected Firefox and Thunderbird installations to these versions or later to remediate the issue. No additional mitigation actions are required beyond applying the official update.
Description
CVE-2023-4580 is a vulnerability in Mozilla Firefox where push notifications stored on disk in private browsing mode were not encrypted. This flaw could potentially allow sensitive information leakage from private browsing sessions. The issue affects Firefox versions prior to 117 and Firefox ESR versions prior to 115.2. Mozilla fixed this vulnerability in Firefox 117 and Firefox ESR 115.2. No public exploits or active exploitation in the wild have been reported. The vulnerability is rated with moderate impact due to the potential exposure of sensitive data.