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VulnerabilityPublished

CVE-2026-28793: @tinacms cli · Path Traversal

Affects @tinacms cliSource CVE Database V5

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Not known to be exploited · CVSS 8.4 High : upgrade to 2.1.8 soon.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
8.4High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 11% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 2.1.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade @tinacms cli to 2.1.8.

Affected software

ProductAffectedFixed in
@tinacmscliAffected
  • <2.1.8
Fixed in
  • 2.1.8

AI-suggested

To mitigate this vulnerability, organizations should immediately upgrade the @tinacms CLI to version 2.1.8 or later, where the path traversal flaw is fixed by enforcing strict validation that resolved paths remain within the media directory. Until upgrading is possible, restrict access to the development server by binding it to localhost only and using firewall rules or network segmentation to prevent unauthorized network access. Developers should avoid exposing the tinacms dev server on public or untrusted networks. Additionally, implement monitoring and alerting for unexpected file system changes in development environments. Review and audit file permissions to minimize the impact of potential unauthorized file writes. Educate development teams about the risks of running vulnerable versions in accessible environments. Finally, incorporate secure coding practices for path handling in custom extensions or integrations with TinaCMS to prevent similar issues.

Description

CVE-2026-28793 is a high-severity path traversal vulnerability in the @tinacms CLI development server versions prior to 2.1.8. The vulnerability allows attackers to exploit improperly validated pathname inputs in media-related HTTP endpoints, enabling arbitrary file read and write outside the intended media directory. This occurs because the CLI server uses decodeURI() and path.join() without ensuring the resolved path remains within the restricted directory. The flaw affects the local HTTP server started by the tinacms dev command, typically on port 4001, exposing endpoints like /media/list/*, /media/upload/*, and /media/*. No authentication or user interaction is required to exploit this vulnerability. The issue is fixed in version 2.1.

References

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