CVE-2026-48149 Cross-site scripting in budibase
Stored XSS in Budibase Text component allows BASIC users to execute JavaScript in admin sessions via unsanitized Markdown rendering.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-48149?
CVE-2026-48149 is a high-severity cross-site scripting vulnerability in budibase, published on 27 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Budibase is an open-source low-code platform. Prior to 3.39.0, the Budibase Text component renders markdown by assigning marked.parse(markdown) straight to innerHTML with no sanitizer (packages/bbui/src/Markdown/MarkdownViewer.svelte:22). Any column a builder binds to a Text component in Markdown mode is a stored-XSS sink writable by every BASIC app user with WRITE on the underlying table. This vulnerability is fixed in 3.39.0.
Weakness: CWE-79
Which versions are affected by CVE-2026-48149?
How do I fix CVE-2026-48149?
No fix has been published for CVE-2026-48149 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-48149 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48149 exists.
Sources
Also known as GHSA-57p7-9h9w-xqpw.