# 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.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **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 available:** No
- **Published:** 30 Jul 2026
- **Updated:** 31 Jul 2026
- **Also known as:** GHSA-cwm9-gfhc-46f6

## 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 (Improper Neutralization of Input During Web Page Generation)

## 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.

## Is CVE-2026-61526 being exploited?

There is no known exploitation of CVE-2026-61526 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-61526 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-61526 in the wild and no public exploit code.

Affected product: adonisjs http-server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-61526/ (Markdown: https://insights.sbomify.com/CVE-2026-61526/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-61526
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-61526
- OSV: https://osv.dev/vulnerability/CVE-2026-61526

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-61526/
Summaries are generated and may contain mistakes; the official description above is the record.