# CVE-2026-6486: classroombookings User Display Name layout.php read cross site scripting

> Remote attackers can inject malicious scripts via the user display name field in classroombookings, potentially leading to session hijacking or code execution.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 17 Apr 2026
- **Updated:** 18 Apr 2026
- **Also known as:** GHSA-376w-pjjp-jrvj

## What is CVE-2026-6486?

CVE-2026-6486 is a medium-severity cross-site scripting vulnerability in classroombookings, published on 17 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

A vulnerability was detected in classroombookings up to 2.17.0. This impacts the function read of the file crbs-core/application/views/layout.php of the component User Display Name Handler. The manipulation of the argument displayname results in cross site scripting. The attack can be executed remotely. The exploit is now public and may be used. Upgrading to version 2.17.1 will fix this issue. The patch is identified as 69c3c9bb8a17f1ea572d8f4502bf238f0214c98a. It is suggested to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-6486?


## How do I fix CVE-2026-6486?

No fix has been published for CVE-2026-6486 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-6486 being exploited?

There is no known exploitation of CVE-2026-6486 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-6486 and fix it if it is affected.

What it is: CVE-2026-6486 is a medium-severity cross-site scripting vulnerability in classroombookings, published on 17 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-6486 in the wild and no public exploit code.

Affected product: classroombookings. 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-2026-6486/ (Markdown: https://insights.sbomify.com/CVE-2026-6486/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-6486
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6486
- OSV: https://osv.dev/vulnerability/CVE-2026-6486

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-6486/
Summaries are generated and may contain mistakes; the official description above is the record.