# CVE-2019-18345: Cross-site scripting in n/a

> Reflected XSS in DAViCal allows attackers to view user data and perform actions, potentially gaining admin access via crafted links.

- **Severity:** Critical 9.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/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:** Yes
- **Published:** 12 Dec 2019
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2019-18345, GHSA-27vg-v28w-gqgh, UBUNTU-CVE-2019-18345

## What is CVE-2019-18345?

CVE-2019-18345 is a critical cross-site scripting vulnerability in Debian Debian Linux, published on 12 Dec 2019. 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

A reflected XSS issue was discovered in DAViCal through 1.1.8. It echoes the action parameter without encoding. If a user visits an attacker-supplied link, the attacker can view all data the attacked user can view, as well as perform all actions in the name of the user. If the user is an administrator, the attacker can for example add a new admin user to gain full access to the application.

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

## Which versions are affected by CVE-2019-18345?

It affects 2 products.


Products: Davical Davical, Debian Debian Linux.

## How do I fix CVE-2019-18345?

Upgrade to a fixed version.

## Is CVE-2019-18345 being exploited?

There is no known exploitation of CVE-2019-18345 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2019-18346](https://insights.sbomify.com/CVE-2019-18346/): Cross-site request forgery in n/a (high 8.8)
- [CVE-2019-18347](https://insights.sbomify.com/CVE-2019-18347/): Cross-site scripting in n/a (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-18345 and fix it if it is affected.

What it is: CVE-2019-18345 is a critical cross-site scripting vulnerability in Debian Debian Linux, published on 12 Dec 2019. 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-2019-18345 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2019-18345/ (Markdown: https://insights.sbomify.com/CVE-2019-18345/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-18345
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-18345
- OSV: https://osv.dev/vulnerability/CVE-2019-18345

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-18345/
Summaries are generated and may contain mistakes; the official description above is the record.