--- title: "CVE-2026-100798: Firefox ESR - Cryptography Misuse" description: "Firefox ESR contains a cryptography misuse vulnerability in the Storage: Quota Manager component, letting attackers potentially compromise data security, exploit requires unspecified conditions." url: https://panop.io/threat-heartbeat/CVE-2026-100798/ --- # CVE-2026-100798 Firefox ESR - Cryptography Misuse Firefox ESR contains a cryptography misuse vulnerability in the Storage: Quota Manager component, letting attackers potentially compromise data security, exploit requires unspecified conditions. CVSS base score 8.1 /10 High CISA KEV Not listed Public exploit None known EPSS 0.20% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-100798) ## Details Type Cryptography Misuse CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N Published 29 September 2026 Updated 15 October 2026 Weakness [CWE-325](https://cwe.mitre.org/data/definitions/325.html) ## Vendor fix Update to Firefox ESR 153.4, 157 or later. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-100798](https://nvd.nist.gov/vuln/detail/CVE-2026-100798) - [https://bugzilla.mozilla.org/show\_bug.cgi?id=2055694](https://bugzilla.mozilla.org/show_bug.cgi?id=2055694) - [https://www.mozilla.org/security/advisories/mfsa2026-100/](https://www.mozilla.org/security/advisories/mfsa2026-100/) - [https://www.mozilla.org/security/advisories/mfsa2026-97/](https://www.mozilla.org/security/advisories/mfsa2026-97/) - [https://www.mozilla.org/security/advisories/mfsa2026-101/](https://www.mozilla.org/security/advisories/mfsa2026-101/) - [https://www.mozilla.org/security/advisories/mfsa2026-103/](https://www.mozilla.org/security/advisories/mfsa2026-103/) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)