CVE-2026-77811 Stored Cross-Site Scripting via Integration Template Asset in OpenSearch Dashboards
Authenticated users can inject arbitrary JavaScript via saved assets, allowing code execution in other users' browser sessions.
- 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-2026-77811?
CVE-2026-77811 is a medium-severity cross-site scripting vulnerability in AWS Amazon OpenSearch Service, published on 21 Aug 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
Improper input validation in the dashboards-observability plugin in OpenSearch Dashboards allows a remote authenticated user with write permissions to OpenSearch Dashboards saved objects to execute arbitrary JavaScript in the context of other users' browser sessions by uploading a saved asset with arbitrary web content.
Weakness: CWE-79
Which versions are affected by CVE-2026-77811?
How do I fix CVE-2026-77811?
No fix has been published for CVE-2026-77811 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-2026-77811 being exploited?
There is no known exploitation of CVE-2026-77811 in the wild and no public exploit code.
Sources
Also known as GHSA-rmqx-r3wm-3px5.