Vulnerability

CVE-2026-45491

Medium· 6.2CVSS6.2EPSS0%

.rules3/5

Improper link resolution before file access ('link following') in .NET allows an unauthorized attacker to perform tampering locally.

Threat signal

62/100

Elevated

Severity

medium

CVSS

6.2

EPSS

Active

CVSS

v3.1via NVDOpen in FIRST calculator →

6.2/ 10MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack VectorLocalRequires local access — shell, console, or local app.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactNoneNo confidentiality impact.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactNoneNo availability impact.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

0.09%

probability of exploitation in next 30 days

p26

higher than 26% of all CVEs

3-day trend↑ 0pp

Low exploitation likelihood — defer if no other signals fire.

Vendor VEX

No VEX statements published for CVE-2026-45491. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCDefer

No exploitation, limited impact or prevalence

exploitation: none
automatable: no
impact: partial
mission: support

Lifecycle

2026-06-09Vendor advisory · microsoftCVE-2026-45491 — .NET Tampering Vulnerability
2026-06-09Published
2026-06-09Last modified1 source
2026-06-11Vendor advisory · ubuntuUSN-8420-1 — .NET vulnerabilities

Entity graph

3 nodes · 2 edges · click to pivot

CVEActorVendor advisoryIOCNews

Vendor advisories

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45491

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.