Is YAFNET.Core affected by CVE-2026-43938?

NuGet YAFNET.Core is affected in >=4.0.0-beta01 <4.0.5, <3.2.12.

Is CVE-2026-43938 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

high

CVE-2026-43938

Q: Is CVE-2026-43938 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

NuGet · YAFNET.Core

Summary

YAFNET has Unauthenticated Stored Second-Order XSS in Admin Event Log via Reflected `User-Agent` Header

Severity: high
EPSS: 0.3% (p20)
Also known as: GHSA-33gv-fc78-qgf5
Published: 2026-05-05

References

https://github.com/YAFNET/YAFNET/security/advisories/GHSA-33gv-fc78-qgf5
https://nvd.nist.gov/vuln/detail/CVE-2026-43938
https://github.com/YAFNET/YAFNET

Related advisories

CVE-2026-43939 — high · NuGet/YAFNET.Core
CVE-2026-43937 — high · NuGet/YAFNET.Core

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.