Skip to content
Fencer Vulns
high 8.8

CVE-2026-108398 json

.NET Framework Security Feature Bypass Vulnerability

published 2026-10-13 26 d ago modified 2026-10-31 8 d ago also EUVD-2026-99069

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

Untrusted search path in .NET Framework allows an authorized attacker to bypass a security feature locally.

Patch / fix

  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0
  • Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.4150.0
  • Microsoft Microsoft .NET Framework 4.8 4.8.4811.0
  • Microsoft Microsoft .NET Framework 4.8.1 4.8.9363.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-108398 updated cvss 8.8

dotnet: .NET Framework: Security feature bypass via untrusted search path

  • Red Hat Hardened Images dotnet8.0 8.0.132-0.1.hum1
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
26 d ago

Exploit prediction

0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2
  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.2
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8
  • Microsoft Microsoft .NET Framework 3.5 AND 4.8.1
  • Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2
  • Microsoft Microsoft .NET Framework 4.8
  • Microsoft Microsoft .NET Framework 4.8.1

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.