How severe is CVE-2026-100798?

CVE-2026-100798 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-100798 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-100798?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-100798 published?

CVE-2026-100798 was published on 2026-09-29 and last updated on 2026-10-01.

CVE-2026-100798

CVE-2026-100798 is a high-severity vulnerability with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-325.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-325
Published: 2026-09-29
Last modified: 2026-10-01

Description

Cryptography misuse in Storage: Quota Manager component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

Frequently asked questions

What is CVE-2026-100798?: Cryptography misuse in Storage: Quota Manager component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
How severe is CVE-2026-100798?: CVE-2026-100798 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-100798 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-100798?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-100798 published?: CVE-2026-100798 was published on 2026-09-29 and last updated on 2026-10-01.

References

Other CWE-325 vulnerabilities

CVE-2026-17666 — Critical (CVSS 9.1): Cryptographic Flaw in Enterprise in Google Chrome prior to 151.0.7922.72 allowed an attacker in a privileged network…
CVE-2026-16000 — High (CVSS 8.7): Missing cryptographic step in the DSTU 7624 CCM mode implementation (KCcmBlockCipher) in Legion of the Bouncy Castle…
CVE-2026-76784 — High (CVSS 8.7): Multiple TP-Link Kasa smart home devices contain insufficient cryptographic protections in the local device…
CVE-2026-4601 — High (CVSS 8.7): Versions of the package jsrsasign before 11.1.1 are vulnerable to Missing Cryptographic Step via the…
CVE-2025-30147 — High (CVSS 8.7): Besu Native contains scripts and tooling that is used to build and package the native libraries used by the Ethereum…
CVE-2026-81235 — High (CVSS 8.0): Dell Wyse Management Suite, versions prior to 2605.0.3.683, contain a Missing Cryptographic Step vulnerability. A high…

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