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The vulnerability of the “Copy as” function in Mozilla Firefox and Thunderbird’s email client allows a hacker to execute arbitrary code.

🗓️ 12 May 2025 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec
 bdu_fstec🔗 bdu.fstec.ru👁 6 Views

Copy as function in Firefox and Thunderbird can allow arbitrary code execution due to cleaning gaps.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
FreeBSD		Mozilla -- insufficient character escaping
29 Apr 202500:00
–freebsd
ATTACKERKB		CVE-2025-4089
29 Apr 202514:15
–attackerkb
AlpineLinux		CVE-2025-4089
29 Apr 202514:15
–alpinelinux
AstraLinux		Astra Linux – Vulnerability in Firefox
16 Jun 202511:28
–astralinux
Chainguard		CVE-2025-4089 vulnerabilities
1 Jul 202614:16
–cgr
Circl		CVE-2025-4089
29 Apr 202515:50
–circl
CNNVD		Mozilla Firefox 安全漏洞
29 Apr 202500:00
–cnnvd
CVE		CVE-2025-4089
29 Apr 202513:13
–cve
Cvelist		CVE-2025-4089 Potential local code execution in "copy as cURL" command
29 Apr 202513:13
–cvelist
Debian CVE		CVE-2025-4089
29 Apr 202513:13
–debiancve
Rows per page
Vulners
Node
mozillafirefoxRange<138
OR
mozillathunderbirdRange<138
SourceLink
mozillawww.mozilla.org/security/advisories/mfsa2025-28/
mozillawww.mozilla.org/security/advisories/mfsa2025-31/
wikiwww.wiki.astralinux.ru/astra-linux-se17-bulletin-2025-0923SE17
altspwww.altsp.su/obnovleniya-bezopasnosti/
xn--80ahaefyxhnwww.xn--80ahaefyxhn.xn--j1afgaq.xn--p1ai/bin/view/%D0%9E%D0%A1%D0%BD%D0%BE%D0%B2%D0%B0/%D0%9E%D0%B1%D0%BD%D0%BE%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D1%8F/2.14/
wikiwww.wiki.astralinux.ru/astra-linux-se47-bulletin-2025-1020SE47
wikiwww.wiki.astralinux.ru/astra-linux-se16-bulletin-20251225SE16
xn--80ahaefyxhnwww.xn--80ahaefyxhn.xn--j1afgaq.xn--p1ai/bin/view/%D0%9E%D0%A1%D0%BD%D0%BE%D0%B2%D0%B0/%D0%9E%D0%B1%D0%BD%D0%BE%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D1%8F/3.1/
webwww.web.nvd.nist.gov/view/vuln/detail
mozillawww.mozilla.org/security/advisories/mfsa2025-28.html
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04 Mar 2026 00:00Current
6.4Medium risk
Vulners AI Score6.4
CVSS 23.6
CVSS 35.1
EPSS0.00156
Copy as functionFirefoxThunderbirdarbitrary code execution
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