Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (CWE-79)
OpenReplay is a self-hosted session replay suite. From 1.24.0 before 1.25.0, the OpenReplay tracking SDK accepts custom event names and captured page URLs from any visitor using a public project key, stores them in ClickHouse without output encoding, and later renders them in the authenticated dashboard through TextEllipsis and the event-details modal, allowing an unauthenticated attacker to store script that executes in the dashboard origin, reads the session JWT from localStorage, and takes over a dashboard account. This issue is fixed in version 1.25.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
NVD published the first details for CVE-2026-55879
A CVSS base score of 9.3 has been assigned.
Feedly found the first article mentioning CVE-2026-55879 . See article
CVE-2026-55879 - OpenReplay: Unauthenticated stored XSS leads to dashboard account takeover
CVE-2026-55879 | OpenReplay up to 1.24.0 Tracking SDK encoding error
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