CVE-2026-4995 wandb OpenUI Window Message Event index.html cross site scripting
Remote attackers can execute arbitrary scripts via a cross-site scripting vulnerability in the OpenUI window message event handler.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-4995?
CVE-2026-4995 is a medium-severity cross-site scripting vulnerability in wandb OpenUI, published on 28 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
A vulnerability was determined in wandb OpenUI up to 1.0. Affected by this vulnerability is an unknown functionality of the file frontend/public/annotator/index.html of the component Window Message Event Handler. This manipulation causes cross site scripting. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-4995?
How do I fix CVE-2026-4995?
No fix has been published for CVE-2026-4995 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-2026-4995 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4995 exists.
Sources
Also known as GHSA-mqr9-jj39-7x6x.