XSS in Triplelift Video-Bundle.js
CVE-2026-82019
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (21.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 21.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- hussein-mahmoud7.medium.com/cve-2026-82019-how-a-random-ad-led-to-dom-xss-while… (technical-description, exploit)
- triplelift.com/creative-technology/ (product)
- www.vulncheck.com/advisories/triplelift-video-bundle-js-dom-based-xss-via-postm… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82019?
- CVE-2026-82019 is a medium-severity vulnerability in Triplelift Video-Bundle.js, classified under Cross-site Scripting. CVSS score: 4.2/10. Published 2026-09-14.
- How severe is CVE-2026-82019?
- Medium severity. CVSS v3 base score is 4.2 out of 10.