Dashboard / CVE-2026-74987

CVE-2026-74987

CRITICAL
INFO Priority: 0.07 BB Relevance: 80/100
Published: 2026-08-18 Modified: 2026-10-28 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: High
I: High
A: High

Description

Internally found bugs present in Firefox ESR 140.13, Firefox ESR 153.0 and Firefox 153. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Weakness Classification (1)

Affected Software (8)

VendorProductVersion
mozilla firefox < 140.14.0
mozilla firefox 141.0 – 153.1.0
mozilla firefox < 140.14.0
mozilla firefox 141.0 – 153.1.0
mozilla thunderbird < 140.14.0
mozilla thunderbird 141.0 – 153.1.0
mozilla thunderbird < 140.14.0
mozilla thunderbird 141.0 – 153.1.0

References & Advisories (9)

Bug Bounty Relevance

80 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

9.8 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploitation Probability

0.71%
Raw Score 0.007150
Percentile 53.6%
Date 2026-10-28

Intelligence Sources

mitre ref →
nvd ref →

External Links