Vulnerability in Mozilla Firefox (CVE-2025-6426)
Summary
Vulnerability in Mozilla Firefox (CVE-2025-6426). Successful exploitation can lead to full system takeover. Exploitable via terminal.
Original description
The description as published by the source.
The executable file warning did not warn users before opening files with the terminal extension.
This bug only affects Firefox for macOS. Other versions of Firefox are unaffected.. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2025-6426 has been found in Mozilla Firefox.
Attackers can target a specific entry point like terminal over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Mozilla Firefox CVE-2025-6426" on the vendor's site.
CVE-2025-6426 (Mozilla Firefox) — CWE-345 / CVSS v3 8.8
Attack vector: remote (network-reachable) / unauthenticated
Attack surface: terminal
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-345) exists in Mozilla Firefox. Attackers reach the vulnerable code path via terminal without authentication.
Check the vendor advisory for the affected versions of Mozilla Firefox. Attack surface: terminal.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Firefox' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'Firefox' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Firefoxを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Ubuntu UBUNTU-CVE-2025-6426 mozjs52
References
- patch security@mozilla.org
- patch security@mozilla.org
- web security@mozilla.org
- web security@mozilla.org
- web security@mozilla.org