# CVE-2020-1766: Improper handling of uploaded inline images

> Attackers can execute malicious JavaScript in agents' browsers via crafted SVG files disguised as inline JPG images in OTRS.

- **Severity:** Low 2.0 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 10 Jan 2020
- **Updated:** 17 Sep 2024
- **Also known as:** DEBIAN-CVE-2020-1766, GHSA-m842-x755-qmxc, UBUNTU-CVE-2020-1766

## What is CVE-2020-1766?

CVE-2020-1766 is a low-severity cross-site scripting vulnerability in Debian Debian Linux, published on 10 Jan 2020. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Due to improper handling of uploaded images it is possible in very unlikely and rare conditions to force the agents browser to execute malicious javascript from a special crafted SVG file rendered as inline jpg file. This issue affects: ((OTRS)) Community Edition 5.0.x version 5.0.39 and prior versions; 6.0.x version 6.0.24 and prior versions. OTRS 7.0.x version 7.0.13 and prior versions.

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

## Which versions are affected by CVE-2020-1766?

It affects 2 products.


Products: Debian Debian Linux, Otrs Otrs.

## How do I fix CVE-2020-1766?

Upgrade to a fixed version.

## Is CVE-2020-1766 being exploited?

There is no known exploitation of CVE-2020-1766 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-1766 and fix it if it is affected.

What it is: CVE-2020-1766 is a low-severity cross-site scripting vulnerability in Debian Debian Linux, published on 10 Jan 2020. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-1766 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-2020-1766/ (Markdown: https://insights.sbomify.com/CVE-2020-1766/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-1766
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-1766
- OSV: https://osv.dev/vulnerability/CVE-2020-1766

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-1766/
Summaries are generated and may contain mistakes; the official description above is the record.