8.8

CVE-2025-6426: mozilla firefox

CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2025-6426CGA-79f3-97x7-mvhwCGA-f9wg-38w2-878f
Published 24-06-2025Last modified 13-04-2026
Open JSON

Vulnerability summary

CVE-2025-6426 is a high (CVSS 8.8) vulnerability in mozilla firefox. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 9.8% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.21%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 14 · Related 15
OPENSUSE-SU-2025-20135-1OPENSUSE-SU-2025:15216-1OPENSUSE-SU-2025:15312-1OPENSUSE-SU-2025:15315-1OPENSUSE-SU-2025:15325-1OPENSUSE-SU-2025:20135-1

Timeline

  1. 24-06-2025
    PublishedVulnerability first disclosed.
  2. 13-04-2026
    Last modifiedVulnerability information updated.

Description

The executable file warning did not warn users before opening files with the `terminal` extension. *This bug only affects Firefox for macOS. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

+0.01 pp

From 0.20% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.21%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu8 products
  • mozjs102All versions (No fix recorded)
  • mozjs115All versions (No fix recorded)
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
  • mozjs68All versions (No fix recorded)
Chainguard2 products
  • firefox< 128.12-r0
  • firefox-esr< 128.12-r0
Mozilla1 product
Wolfi1 product
  • firefox< 128.12-r0

4 vendors · 12 products

References

10 links