# CVE-2026-93981: hono/jsx before 4.13.7 Cross-Site Scripting via Unescaped Strings

> Attackers can inject arbitrary HTML and execute scripts via unescaped strings in Hono's JSX server-side rendering paths.

- **Severity:** Low 2.3 (`CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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:** Yes
- **Published:** 19 Sep 2026
- **Updated:** 21 Sep 2026
- **Also known as:** CLEANSTART-2026-XJ89225, ECHO-5ad5-5923-2065, GHSA-hxh3-vqpv-xpqv, MINI-3ph3-599f-hv8f, MINI-56hv-h475-5428, MINI-67hq-97rc-m3m9, MINI-9pxf-pwr8-6838, MINI-m37q-xf5g-mx5c, MINI-m8mw-4793-f39f, MINI-wvg4-8prv-2cq2, RHSA-2026:73654

## What is CVE-2026-93981?

CVE-2026-93981 is a low-severity cross-site scripting vulnerability in honojs hono, published on 19 Sep 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

hono before 4.13.7 fails to HTML-escape plain strings rendered by hono/jsx as a child or fallback of Suspense, as a string child of ErrorBoundary alongside an asynchronous sibling, as the single child of a Context.Provider, or as the root value passed to renderToString() or renderToReadableStream() from hono/jsx/dom/server. These paths stringify their input and treat the result as already-escaped markup, so an attacker who controls such a string during server-side rendering can inject arbitrary HTML and execute script under the application's origin.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-93981?

2 open source packages ship an affected version, including hono.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `hono` | npm | All versions | 4.13.7 |
| `hono` | npm | All versions | 4.13.7 |
| `grafana12.4` | Red Hat:hummingbird:1 | All versions | 0:12.4.10-0.10.hum1 |

## How do I fix CVE-2026-93981?

Upgrade hono to 4.13.7 or later.

## Is CVE-2026-93981 being exploited?

There is no known exploitation of CVE-2026-93981 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93981 and fix it if it is affected.

What it is: CVE-2026-93981 is a low-severity cross-site scripting vulnerability in honojs hono, published on 19 Sep 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-2026-93981 in the wild and no public exploit code.

Affected packages and fixed versions:
- hono (npm): affected all versions; fixed in 4.13.7
- hono (npm): affected all versions; fixed in 4.13.7

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-2026-93981/ (Markdown: https://insights.sbomify.com/CVE-2026-93981/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93981
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93981
- OSV: https://osv.dev/vulnerability/CVE-2026-93981

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93981/
Summaries are generated and may contain mistakes; the official description above is the record.