7.5

CVE-2026-8945: mozilla firefox Protection Mechanism Failure

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2026-8945CGA-m4rr-r9gv-89hpCGA-ppm8-2qm6-fwcg
Published 19-05-2026Last modified 15-07-2026
Open JSON

Vulnerability summary

CVE-2026-8945 is a high (CVSS 7.5) Protection Mechanism Failure vulnerability in mozilla firefox. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 32.5% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.40%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 3
OPENSUSE-SU-2026:10863-1OPENSUSE-SU-2026:11373-1CGA-RQ46-F9C3-P8G5

Timeline

  1. 19-05-2026
    PublishedVulnerability first disclosed.
  2. 15-07-2026
    Last modifiedVulnerability information updated.

Description

Sandbox escape in Firefox and Firefox Focus for Android. This vulnerability was fixed in Firefox 151.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

+0.03 pp

From 0.37% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.40%

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)
Mozilla2 products
Chainguard1 product
  • firefox< 151-r0
Wolfi1 product
  • firefox< 151-r0

4 vendors · 12 products

References

8 links