CVE-2026-82019 TripleLift video-bundle.js DOM-based XSS via postMessage
Attackers can execute arbitrary JavaScript on publisher sites via unvalidated postMessage in TripleLift's video-bundle.js, enabling session hijacking.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-82019?
CVE-2026-82019 is a low-severity cross-site scripting vulnerability in TripleLift video-bundle.js, published on 14 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-82019?
How do I fix CVE-2026-82019?
No fix has been published for CVE-2026-82019 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-82019 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82019 exists.
Sources
Also known as GHSA-cf92-q3x8-658f.