CVE-2026-28445Public exploitNetwork attack vector

Stored XSS via unsanitized rating icon SVG

Published May 22, 2026 · Updated May 22, 2026

Stored XSS in Typebot 3.15.2 and earlier allows remote authenticated users to execute JavaScript when a victim previews a crafted bot. The RatingButton component passes the user-controlled customIcon.svg string to Solid's innerHTML directive without sanitization, so rating blocks evade the import sanitizer's isUnsafe flag and execute in the builder origin. A victim must import the crafted bot or share a workspace with an editor and then preview it, exposing the victim's authenticated builder session to token theft and unauthorized workspace actions.

CVSS severity8.7
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Typebot 3.15.2 and earlier allows remote authenticated users to execute JavaScript when a victim previews a crafted bot. The RatingButton component passes the user-controlled customIcon.svg string to Solid's innerHTML directive without sanitization, so rating blocks evade the import sanitizer's isUnsafe flag and execute in the builder origin. A victim must import the crafted bot or share a workspace with an editor and then preview it, exposing the victim's authenticated builder session to token theft and unauthorized workspace actions.

The record

CVE
CVE-2026-28445
Published
May 22, 2026
Updated
May 22, 2026
Vendor
Typebot
Product
Typebot
Classifications
CWE-79, T1539, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 22, 2026CVE publishedPublication date reported by the CVE source.
  2. May 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.16.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Typebot · Typebotversion=< 3.16.0

Published CVSS scores

8.7GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1539Steal Web Session Cookie
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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