---
id: CVE-2026-82019
title: >-
  TripleLift's ad rendering script (video-bundle.js) contains a DOM-based
  cross-site scripting vulnerability that allows unauthenticated attackers to
  execute arbitrary JavaScript in a publisher's domain by sending crafted
  postMessage paylo…
summary: >-
  TripleLift's ad rendering script (video-bundle.js) contains a DOM-based
  cross-site scripting vulnerability that allows unauthenticated attackers to
  execute arbitrary JavaScript in a publisher's domain by sending crafted
  postMessage paylo…
severity: medium
cvss: 4.2
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: TripleLift
product: video-bundle.js
affected:
  - video-bundle.js < 2026-04-28
published: '2026-09-14'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:28:01.780'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82019'
references:
  - url: >-
      https://hussein-mahmoud7.medium.com/cve-2026-82019-how-a-random-ad-led-to-dom-xss-while-testing-chess-com-f043584e1e68
    label: disclosure@vulncheck.com
  - url: 'https://triplelift.com/creative-technology/'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/triplelift-video-bundle-js-dom-based-xss-via-postmessage
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00289
epssPercentile: 0.19052
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T15:29:39.237880Z'
ingestedAt: '2026-09-14T15:23:07.424Z'
---

## Overview

TripleLift's ad rendering script (video-bundle.js) contains a DOM-based cross-site scripting vulnerability that allows unauthenticated attackers to execute arbitrary JavaScript in a publisher's domain by sending crafted postMessage payloads without origin validation. Attackers can cause a victim to visit an attacker-controlled page that sends malicious postMessage events to a publisher page running the ad script, enabling session hijacking and unauthorized DOM manipulation.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.