---
title: "CVE-2026-28792: TinaCMS CLI Dev Server Vulnerable to Cross-Origin File Exfiltration via CORS Misconfiguration + Path Traversal in TinaCMS"
url: https://erroneo.us/security/cve/CVE-2026-28792/
description: "CVE-2026-28792 (@tinacms/cli (npm)): Tina is a headless content management system. Prior to 2.1.8 , the TinaCMS CLI dev server combines a permissive CORS…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-12
date_modified: 2026-03-13
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-28792"
kev: false
cvss: 9.7
epss: 0.00652
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-28792: TinaCMS CLI Dev Server Vulnerable to Cross-Origin File Exfiltration via CORS Misconfiguration + Path Traversal in TinaCMS

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.7% , percentile 51: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 51% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
- Only applies if your dependency tree includes @tinacms/cli (npm) < 2.1.8, fixed in 2.1.8 . Check your lockfile, including transitive dependencies.

## What it is

Tina is a headless content management system. Prior to 2.1.8 , the TinaCMS CLI dev server combines a permissive CORS configuration (Access-Control-Allow-Origin: ) with the path traversal vulnerability (previously reported) to enable a browser-based drive-by attack. A remote attacker can enumerate the filesystem, write arbitrary files, and delete arbitrary files on developer's machines by simply tricking them into visiting a malicious website while tinacms dev is running. This vulnerability is fixed in 2.1.8.

## Affected packages

- npm `@tinacms/cli` < 2.1.8 → fixed: 2.1.8

## Affected products (CVE record)

- @tinacms cli: < 2.1.8

## Severity

- GitHub_M CVSS 3.1: 9.7 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.65% probability of exploitation activity in the next 30 days; percentile 51.

## Sources

- [GitHub Advisory GHSA-8pw3-9m7f-q734](https://github.com/advisories/GHSA-8pw3-9m7f-q734)
- [CVE.org record CVE-2026-28792](https://www.cve.org/CVERecord?id=CVE-2026-28792)
- [NVD entry CVE-2026-28792](https://nvd.nist.gov/vuln/detail/CVE-2026-28792)
- [github.com](https://github.com/tinacms/tinacms/security/advisories/GHSA-8pw3-9m7f-q734)
- [github.com](https://github.com/tinacms/tinacms/pull/6450)
- [github.com](https://github.com/tinacms/tinacms/commit/56d533e610a520ba66b3e58f3a0dc03487d5d5d7)
- [github.com](https://github.com/tinacms/tinacms/releases/tag/%40tinacms%2Fcli%402.1.8)

---
Source page: https://erroneo.us/security/cve/CVE-2026-28792/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt