CVE-2026-108398: .NET Framework Security Feature Bypass Vulnerability
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-01 19:19 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
Untrusted search path in .NET Framework allows an authorized attacker to bypass a security feature locally.
Description quoted from the CVE record (assigned by microsoft, published 2026-10-13).
Weakness: CWE-426: Untrusted Search Path
How it can be exploited
Exploitable with local access with low attack complexity needing low privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. 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
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: no. Technical impact: total.
Public exploit evidence (Exploit Observer)
Exploit Observer evidence for this CVE has not been fetched yet.
Live scores
- EPSS
- 0.008
low predicted chance of attack - VEDAS
- 0.053
little exploit evidence - On CISA KEV
- Not listed
- Detection rule
- None yet
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 | from 3.0.0.0 before 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 | Not stated |
| Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 | from 4.7.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 | Not stated |
| Microsoft Microsoft .NET Framework 3.5 AND 4.8 | from 4.8.0 before 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 | Not stated |
| Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 | from 4.8.1 before 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 | Not stated |
| Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 | from 4.7.0 before 4.7.4150.0 | Not stated |
| Microsoft Microsoft .NET Framework 4.8 | from 4.8.0 before 4.8.4811.0 | Not stated |
| Microsoft Microsoft .NET Framework 4.8.1 | from 4.8.0.0 before 4.8.9363.0 | Not stated |
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
Fixed versions stated in the CVE record: 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0, 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0, 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0, 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0, 4.7.4150.0, 4.8.4811.0, 4.8.9363.0.
Vendor guidance:
- .NET Framework Security Feature Bypass Vulnerability (vendor-advisory, patch)
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
Advisories on this CVE
- Microsoft October 2026 Patch Tuesday: exploited Windows Shell MOTW bypass (CVE-2026-96951) and two disclosed .NET flaws (full advisory)
- Microsoft October Patch Tuesday: exploited Windows Shell bypass and a disclosed .NET Framework WDAC bypass (CVE-2026-96951, CVE-2026-108398, CVE-2026-92707) (13 Oct 2026)
References
Vendor advisories and patches
- .NET Framework Security Feature Bypass Vulnerability (vendor-advisory, patch)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS). Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.