CVE-2026-82019

2.3 lowEPSS 0.3%

Low (2.3). EPSS 0.3% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

2.3 low

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS 3.1

4.2 medium

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 21% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-09-14
Modified: 2026-09-24
Record from: the NVD, synced 2026-10-19

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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