CVE-2026-29066Public exploit

Arbitrary file read via disabled filesystem restriction

Published Mar 12, 2026 · Updated Mar 12, 2026

Information disclosure in the TinaCMS @tinacms/cli dev server before 2.1.8 allows remote attackers to read host files via HTTP requests. The Vite setup in packages/@tinacms/cli/src/next/vite/index.ts sets server.fs.strict to false, and unmatched routes fall through to a static handler that resolves absolute paths. Exploitation requires a running dev server reachable on port 4001 and exposes any file readable by its process, including secrets and credentials.

CVSS severity6.2
Medium
EPSS probability1.03%
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 the TinaCMS @tinacms/cli dev server before 2.1.8 allows remote attackers to read host files via HTTP requests. The Vite setup in packages/@tinacms/cli/src/next/vite/index.ts sets server.fs.strict to false, and unmatched routes fall through to a static handler that resolves absolute paths. Exploitation requires a running dev server reachable on port 4001 and exposes any file readable by its process, including secrets and credentials.

The record

CVE
CVE-2026-29066
Published
Mar 12, 2026
Updated
Mar 12, 2026
Vendor
TinaCMS
Product
@tinacms/cli
Classifications
CWE-552, CWE-200, T1005
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 12, 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=< 2.1.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

TinaCMS · @tinacms/cliversion=< 2.1.8

Published CVSS scores

6.2GitHub, Inc.CVSS:3.1/AV:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-552Files or Directories Accessible to External Parties
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1005Data from Local System

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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