CVE-2026-12300

MEDIUM

CVSS v3.1: 5.3

NetworkNo privilegesNo user interactionMemory CorruptionVendor advisory ref

Source data as of:

At a glance

Severity
MEDIUM
CVSS
5.3 v3.1 · NVD
EPSS
EPSS not provided by FIRST.org for this CVE
CISA KEV
No
Type
Memory Corruption · NVD CWE
Attack conditions (CVSS vector)
NetworkNo privilegesNo user interaction · Source: NVD Vector
Published
2026-06-16 · Modified: 2026-06-16
References
Jump to references (3)

CVSS / EPSS / KEV

CVSS v3.1 5.3 / 10 MEDIUM Source: NVD
EPSS — EPSS not provided by FIRST.org for this CVE Source: FIRST.org
CISA KEV No Source: CISA

Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources

Description

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

Record details

CVE ID
CVE-2026-12300
CVSS (v3.1)
5.3 (MEDIUM)
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Exploitability subscore
3.9
Impact subscore
1.4
CISA KEV
No
Weakness (CWE)
CWE-119
Affected configurations (CPE)
0
Published
2026-06-16
Modified
2026-06-16
Status
Undergoing Analysis

References

Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.

Related records

Other records sharing a factual facet, for cross-reference. A descriptive neighbourhood — ordering does not imply priority and is not a recommendation.

Same weakness type (CWE)

CVE-2026-12174 HIGH CVSS 8.8 CVE-2026-12305 HIGH CVSS 7.5 CVE-2026-12310 HIGH CVSS 7.5 CVE-2026-12312 HIGH CVSS 7.5

Published the same year

CVE-2026-20127 CRITICAL CVSS 10.0 KEV CVE-2026-20182 CRITICAL CVSS 10.0 KEV CVE-2026-48907 CRITICAL CVSS 10.0 KEV CVE-2026-40750 CRITICAL CVSS 9.9
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