What is the CVSS score of EUVD-2026-31466?

EUVD-2026-31466 has a CVSS 3.1 base score of 8.7 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

Which versions of Typebot are affected by EUVD-2026-31466?

Typebot's SaaS chatbot builder platform (versions 3.15.2 and prior) contains a vulnerability enabling attackers to compromise authenticated builder accounts through shared or imported bot files,…. A patch is available.

How to fix or mitigate EUVD-2026-31466?

Within 24 hours: Identify all Typebot users and document collaborative chatbot workflows within your organization. Within 7 days: Contact Typebot support to request patch timeline and interim security measures; if unavailable, restrict bot imports to internally-created sources and disable external collaboration pending a fix. Within 30 days: Apply patch immediately upon vendor release, or formally document and maintain the recommended compensating controls indefinitely.

Typebot EUVD-2026-31466

| CVE-2026-28445 HIGH

Cross-site Scripting (XSS) (CWE-79)

2026-05-22 GitHub_M

GHSA-6m7c-xfhp-p9fh

XSS Privilege Escalation Typebot Io

8.7

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

8.7 HIGH

AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Lifecycle Timeline

Patch available

May 26, 2026 - 18:02 EUVD

Source Code Evidence Fetched

May 22, 2026 - 16:45 vuln.today

Analysis Generated

May 22, 2026 - 16:45 vuln.today

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

1 npm packages depend on @typebot.io/js (1 direct, 0 indirect)

Ecosystem-wide dependent count for version 0.10.1.

DescriptionGitHub Advisory

Typebot is a chatbot builder tool. In versions 3.15.2 and prior, the RatingButton component in the embed package renders the user-controlled customIcon.svg field directly via Solid's innerHTML directive without any sanitization, even though DOMPurify is already a dependency and is used elsewhere in the codebase (e.g., StreamingBubble.tsx). Because rating blocks are not flagged as isUnsafe by the import sanitizer and the builder preview renders bots inline on the builder's own origin (builder.typebot.io) under a CSP permitting 'unsafe-inline', a malicious imported or collaborator-crafted typebot can execute arbitrary HTML/JS in the builder's authenticated context, bypassing the Web Worker sandbox that protects Script blocks during preview. This allows session hijacking and privilege escalation within the builder application. This issue has been fixed in version 3.16.0.

AnalysisAI

Stored cross-site scripting in Typebot chatbot builder versions 3.15.2 and prior allows a malicious imported or collaborator-crafted bot to execute arbitrary HTML/JavaScript in the authenticated builder context via the RatingButton component's customIcon.svg field. Because the builder preview renders bots inline on builder.typebot.io under a CSP permitting 'unsafe-inline', successful exploitation enables session hijacking and privilege escalation within the SaaS builder, with no public exploit identified at time of analysis.

Technical ContextAI

Typebot is an open-source chatbot builder (CPE cpe:2.3:a:baptistearno:typebot.io) whose embed package uses SolidJS, where the RatingButton component passes the user-controlled customIcon.svg string directly to Solid's innerHTML directive - a sink equivalent to React's dangerouslySetInnerHTML. This is a textbook CWE-79 (Improper Neutralization of Input During Web Page Generation) where DOMPurify was already a project dependency and used in StreamingBubble.tsx, but was never invoked on the rating block's SVG payload. Compounding the sink exposure, the import sanitizer did not flag rating blocks as isUnsafe, and the builder origin's CSP permits 'unsafe-inline' scripts, which neutralizes the Web Worker sandbox that normally isolates Script blocks during preview rendering.

RemediationAI

Vendor-released patch: upgrade Typebot to version 3.16.0 or later, available at https://github.com/baptisteArno/typebot.io/releases/tag/v3.16.0; the fix commit 474ecbf46bc47a75265bada2599f12b2179de375 adds DOMPurify-based sanitizeSvgFragment and sanitizeHtmlFragment helpers and applies sanitizeSvgFragment to rating-block customIcon.svg and sanitizeHtmlFragment to file-block placeholder labels inside the import sanitizer. For self-hosted operators who cannot immediately upgrade, restrict who can import typebots or invite collaborators (disable open imports, gate collaborator add to verified workspace admins), and review existing typebots for rating blocks containing <script>, on*= handlers, or javascript: URIs in customIcon.svg before opening them in the builder - note this manual review does not scale and will miss obfuscated payloads. Tightening the builder CSP to remove 'unsafe-inline' is the strongest compensating control but will break legitimate inline-script features of the builder preview, so it should only be applied if you can validate the builder still functions; consult the GHSA-6m7c-xfhp-p9fh advisory for vendor guidance.