CVE-2026-55879 OpenReplay: Unauthenticated stored XSS leads to dashboard account takeover
Unauthenticated attackers can inject scripts via custom events to steal session tokens and take over OpenReplay dashboard accounts.
- 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-2026-55879?
CVE-2026-55879 is a critical cross-site scripting vulnerability in openreplay, published on 10 Jul 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
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-55879?
How do I fix CVE-2026-55879?
No fix has been published for CVE-2026-55879 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-2026-55879 being exploited?
There is no known exploitation of CVE-2026-55879 in the wild and no public exploit code.
Sources
Also known as GHSA-3mfc-7hf4-jfxh.