Vulnerability · Published Sep 14, 2026 · Assigned by VulnCheck

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

Medium 4.2

In plain English

A medium-severity cross-site scripting in video-bundle.js from TripleLift. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)4.2Medium

Exploit odds (30 days)0.3%top 78.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
TripleLift	video-bundle.js	0 – before 2026-04-28

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

References

Researcher Blog technical-description, exploit
Vendor Webpage product
https://www.vulncheck.com/advisories/triplelift-video-bundle-js-dom-based-xss-via-postmessage third-party-advisory