CVE-2026-48818Network attack vectorHinoki check available

NTLM credential disclosure via UNC path resolution

Published Jun 17, 2026 · Updated Jun 17, 2026

SSRF in Starlette StaticFiles before 1.1.0 allows remote attackers to disclose Windows service-account NTLMv2 credentials via UNC paths. StaticFiles.lookup_path joins the request path to the served directory and calls os.path.realpath before containment validation, so an absolute UNC path discards the directory and initiates SMB authentication. The default follow_symlink=False setting is required; the request returns 404 after credentials are exposed for offline cracking or relay, while POSIX systems are unaffected.

CVSS severity7.5
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in Starlette StaticFiles before 1.1.0 allows remote attackers to disclose Windows service-account NTLMv2 credentials via UNC paths. StaticFiles.lookup_path joins the request path to the served directory and calls os.path.realpath before containment validation, so an absolute UNC path discards the directory and initiates SMB authentication. The default follow_symlink=False setting is required; the request returns 404 after credentials are exposed for offline cracking or relay, while POSIX systems are unaffected.

The record

CVE
CVE-2026-48818
Published
Jun 17, 2026
Updated
Jun 17, 2026
Vendor
Kludex
Product
Starlette
Classifications
CWE-918, T1187
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Kludex · Starletteversion=< 1.1.0

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1187Forced Authentication

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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