Vulnerability · Published May 27, 2026 · Assigned by GitHub_M

CVE-2026-48149Budibase: Stored XSS in Text component: BASIC users execute JS in admin session via MarkdownViewer innerHTML + CDN+srcdoc CSP bypass

High 8.1

In plain English

A high-severity cross-site scripting in budibase from Budibase. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.2%top 86.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Budibase	budibase	< 3.39.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

https://github.com/Budibase/budibase/security/advisories/GHSA-57p7-9h9w-xqpw x_refsource_CONFIRM