---
id: "CVE-2026-126269"
page: "https://infrastack.ai/live/CVE-2026-126269"
kind: "vulnerability"
aliases: ["CVE-2026-126269"]
title: "NocoDB: stored XSS via attachment MIME types steals session tokens"
severity: "critical"
cvss: 9.3
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["nocodb", "other", "self-hosted"]
not_affected_if: ["no-editor-users", "version-2026.09.0-or-later"]
published_at: "2026-11-13T10:17:29+00:00"
first_seen_at: "2026-11-13T10:47:12+00:00"
updated_at: "2026-11-13T10:48:24+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126269", "first_seen_at": "2026-11-13T10:47:12+00:00"}]
exploit_sources: []
---

# NocoDB: stored XSS via attachment MIME types steals session tokens

Link for people: https://infrastack.ai/live/CVE-2026-126269 (this .md is for agents)

NocoDB before 2026.09.0 lets an authenticated Editor store a crafted attachment MIME type such as text/html;image/png, so the /dltemp signed URL serves HTML inline. Script running in that page can read session tokens from localStorage and impersonate other users.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the NocoDB version in use; it is affected below `2026.09.0`.

## Fix

- Move to `2026.09.0` or later, per the NVD range.

## Timeline

- 2026-11-13T10:47:12+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126269

## Documents

- [advisory] Vendor advisory: github.com https://github.com/nocodb/nocodb/security/advisories/GHSA-3f7w-wqf7-786q
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/nocodb-before-2026.09.0-stored-xss-via-attachment-mime-type

## From the sources

NocoDB before 2026.09.0 contains a stored cross-site scripting vulnerability that allows authenticated Editor users to execute scripts by storing crafted attachment MIME types like text/html;image/png. Attackers can write the value through the records API so the /dltemp signed URL serves HTML inline, stealing session tokens from localStorage to impersonate victims.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_