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The vulnerability of Mozilla Firefox, Firefox ESR, and the email client Thunderbird lies in the absence of a “Secure” flag in HTTPS session cookie files. This allows attackers to compromise the privacy and integrity of the protected information.

🗓️ 29 Aug 2025 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec
 bdu_fstec
🔗 bdu.fstec.ru👁 2 Views

Firefox, Firefox ESR, and Thunderbird lack Secure flag on session cookies, enabling remote attackers to compromise confidentiality and integrity.

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04 Mar 2026 00:00Current
7.3High risk
Vulners AI Score7.3
CVSS 39.1
CVSS 29.4
EPSS0.00219
2