CVE-2020-1766 Improper handling of uploaded inline images

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

Which versions are affected by CVE-2020-1766?

It affects 2 products.

Products include Debian Debian Linux, Otrs Otrs.

How do I fix CVE-2020-1766?

Upgrade to a fixed version.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

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 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2020-1766, GHSA-m842-x755-qmxc, UBUNTU-CVE-2020-1766.