Is CVE-2026-48818 actively exploited?

No active exploitation of CVE-2026-48818 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-48818 be exploited remotely?

Yes. CVE-2026-48818 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-48818?

CVE-2026-48818 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-48818

HIGH

CVE-2026-48818

CWE-918Published: June 17, 2026· Updated: Jun 22, 2026

7.5

CVSS v3.1

Official Description

Starlette is a lightweight ASGI framework/toolkit. In versions 1.0.1 and earlier, StaticFiles on Windows is vulnerable to SSRF. An UNC path such as \\attacker.com\share can cause os.path.realpath to initiate an outbound SMB connection before the path is rejected, exposing the service account’s NTLMv2 credentials for offline cracking or relay even though the HTTP response is only a 404. The issue affects default follow_symlink=False deployments, including frameworks built on Starlette such as FastAPI; POSIX systems and follow_symlink=True are unaffected. The issue is fixed in 1.1.0.

NVD Source

Technical Analysis

CVE-2026-48818 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.