CVE-2023-23599: Mozilla Firefox · Vulnerability
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited : upgrade to 109 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 48% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 109
Exploitation evidence
Disclosed: evidence found.
CVE published 2 Jun 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 109.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Mozilla Firefox | Affected
| Fixed in
|
AI-suggested
Mozilla has released official fixes for this vulnerability in Firefox 109 and Thunderbird 102.7. Users and administrators should update to these versions or later to remediate this issue. No additional mitigation steps are required beyond applying the official patches.
Description
CVE-2023-23599 is a moderate-impact vulnerability in Mozilla Firefox and Thunderbird where copying a network request as a curl command from the developer tools panel on Windows does not properly sanitize the output. This flaw could allow arbitrary commands to be hidden within the copied curl command. The issue affects Firefox versions prior to 109 and Thunderbird versions prior to 102.7. Mozilla fixed this vulnerability in Firefox 109 and Thunderbird 102.7.