What’s Vulnerable › Vulnerabilities

CVE-2026-82019: TripleLift video-bundle.js DOM-based XSS via postMessage

• Severity: medium (CVSS 4.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-24
• Weakness: CWE-79

Description

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.

Affected products

• TripleLift video-bundle.js: before 2026-04-28 — fixed in 2026-04-28

How to fix

Upgrade to a fixed version: TripleLift video-bundle.js 2026-04-28. Check the vendor advisory for mitigations.

References

• https://hussein-mahmoud7.medium.com/cve-2026-82019-how-a-random-ad-led-to-dom-xss-while-testing-chess-com-f043584e1e68
• https://triplelift.com/creative-technology/
• https://www.vulncheck.com/advisories/triplelift-video-bundle-js-dom-based-xss-via-postmessage

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