CVE-2026-61526 AdonisJS HTTP Server is vulnerable to reflected XSS through its exception handler
Attackers can execute arbitrary JavaScript via reflected XSS in the default exception handler when debug mode is disabled and no custom error page is configured.
- 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-2026-61526?
CVE-2026-61526 is a medium-severity cross-site scripting vulnerability in adonisjs http-server, published on 30 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
AdonisJS HTTP Server is a package for handling HTTP requests in the AdonisJS framework. In versions 8.0.0-next.0 through 8.2.0 and 9.0.0 through 9.0.2, the error.message is interpolated into the default HTML exception response without escaping, allowing a crafted missing-route URL to execute attacker-controlled JavaScript when a victim opens it and no custom status page or JSON response handles the error. When debug mode is disabled and no custom status page handles the error, the default HTML renderer interpolates error.message directly into an HTML response. This issue is fixed in versions 8.2.1 and 9.1.0.
Weakness: CWE-79
Which versions are affected by CVE-2026-61526?
How do I fix CVE-2026-61526?
No fix has been published for CVE-2026-61526 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-2026-61526 being exploited?
There is no known exploitation of CVE-2026-61526 in the wild and no public exploit code.
Sources
Also known as GHSA-cwm9-gfhc-46f6.