# CVE-2026-29519: Lucee CFML Server Reflected XSS via URL Path Parsing

> Unauthenticated attackers can execute arbitrary JavaScript in victims' browsers via crafted URLs, potentially hijacking sessions or compromising the Lucee admin interface.

- **Severity:** Medium 6.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/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:** No
- **Published:** 10 Jul 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-frv8-q5jq-3qhq

## What is CVE-2026-29519?

CVE-2026-29519 is a medium-severity cross-site scripting vulnerability in Lucee, published on 10 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

Lucee CFML Server versions across the 5.3.x, 6.1.x, 6.2.x, and 7.0.x release lines contain a reflected cross-site scripting vulnerability in URL path parsing that allows unauthenticated remote attackers to execute arbitrary JavaScript in a victim's browser by embedding HTML or JavaScript payloads within the request path. Attackers can craft a malicious URL containing injected script content that is reflected in the server's response without proper output encoding, enabling session hijacking or unauthorized actions against the Lucee administrative interface when a victim visits the crafted link.

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

## Which versions are affected by CVE-2026-29519?


## How do I fix CVE-2026-29519?

No fix has been published for CVE-2026-29519 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-29519 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29519 exists.

Public exploit code:

- Proof of Concept for Reflected XSS in Lucee CFML (CVE-2026-29519) (github_poc): https://github.com/L4V4D0/CVE-2026-29519-Lucee-Reflected-XSS

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-29519 and fix it if it is affected.

What it is: CVE-2026-29519 is a medium-severity cross-site scripting vulnerability in Lucee, published on 10 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-29519 exists.

Affected product: Lucee. 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-2026-29519/ (Markdown: https://insights.sbomify.com/CVE-2026-29519/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-29519
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29519
- OSV: https://osv.dev/vulnerability/CVE-2026-29519

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-29519/
Summaries are generated and may contain mistakes; the official description above is the record.