CVE-2026-28792Public exploitNetwork attack vector

Arbitrary file read, write, and deletion via CORS

Published Mar 12, 2026 · Updated Mar 12, 2026

Path traversal in the @tinacms/cli dev server before 2.1.8 allows remote attackers to read, write, and delete arbitrary local files. Wildcard CORS middleware in server.ts and plugins.ts accepts any web origin, letting browser JavaScript reach traversal-capable media routes beyond the media directory. Exploitation requires the developer to run tinacms dev and visit an attacker-controlled page; the server can remain bound to localhost.

CVSS severity9.6
Critical
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in the @tinacms/cli dev server before 2.1.8 allows remote attackers to read, write, and delete arbitrary local files. Wildcard CORS middleware in server.ts and plugins.ts accepts any web origin, letting browser JavaScript reach traversal-capable media routes beyond the media directory. Exploitation requires the developer to run tinacms dev and visit an attacker-controlled page; the server can remain bound to localhost.

The record

CVE
CVE-2026-28792
Published
Mar 12, 2026
Updated
Mar 12, 2026
Vendor
TinaCMS
Product
@tinacms/cli
Classifications
CWE-22, CWE-942, T1189
Attack vector
network
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 vectornetwork
Required privilegesunauthenticated

What is affected?

TinaCMS · @tinacms/cliversion=< 2.1.8

Published CVSS scores

9.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

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 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 exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-942Permissive Cross-domain Security Policy with Untrusted Domains
T1189Drive-by Compromise

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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