CVE-2025-59427Public exploitNetwork attack vector

Secret disclosure via missing dev-server deny rules

Published Sep 19, 2025 · Updated Sep 19, 2025

Information disclosure in Cloudflare Workers SDK's Vite plugin before 1.6.0 allows remote attackers to read project files. The cloudflare() Vite configuration supplies no server.fs.deny rules, so dev-server routing serves root files instead of limiting requests to configured assets. Reachability requires a development server exposed to a local network or the internet, and the bounded consequence is read-only disclosure of secrets and internal files.

CVSS severityUnavailable
Unscored
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Cloudflare Workers SDK's Vite plugin before 1.6.0 allows remote attackers to read project files. The cloudflare() Vite configuration supplies no server.fs.deny rules, so dev-server routing serves root files instead of limiting requests to configured assets. Reachability requires a development server exposed to a local network or the internet, and the bounded consequence is read-only disclosure of secrets and internal files.

The record

CVE
CVE-2025-59427
Published
Sep 19, 2025
Updated
Sep 19, 2025
Vendor
Cloudflare
Product
Cloudflare Workers SDK
Classifications
CWE-200, T1552.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 2025Record 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=< 1.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cloudflare · Cloudflare Workers SDKversion=< 1.6.0

Published CVSS scores

6.9GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1552.001Unsecured Credentials: Credentials In Files

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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