CVE-2020-8020 Persistent XSS in markdown parser used by obs-server

What is CVE-2020-8020?

CVE-2020-8020 is a medium-severity cross-site scripting vulnerability in Debian Debian Linux, published on 13 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A Improper Neutralization of Input During Web Page Generation vulnerability in open-build-service allows remote attackers to store arbitrary JS code to cause XSS. This issue affects: openSUSE open-build-service versions prior to 7cc32c8e2ff7290698e101d9a80a9dc29a5500fb.

Weakness: CWE-79

Which versions are affected by CVE-2020-8020?

It affects 2 products.

Products include Debian Debian Linux, Opensuse Open Build Service.

How do I fix CVE-2020-8020?

Apply the vendor's patch.

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-2020-8020 being exploited?

There is no known exploitation of CVE-2020-8020 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-2020-8020, GHSA-mjhp-68j4-wwx7, UBUNTU-CVE-2020-8020.