CVE-2017-1002201 Haml vulnerable to cross-site scripting

What is CVE-2017-1002201?

CVE-2017-1002201 is a medium-severity cross-site scripting vulnerability in Debian Debian Linux, published on 15 Oct 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

In haml versions prior to version 5.0.0.beta.2, when using user input to perform tasks on the server, characters like < > " ' must be escaped properly. In this case, the ' character was missed. An attacker can manipulate the input to introduce additional attributes, potentially executing code.

Weakness: CWE-79

Which versions are affected by CVE-2017-1002201?

2 open source packages ship an affected version, including haml. It affects 2 products.

Products include Debian Debian Linux, Haml Haml.

How do I fix CVE-2017-1002201?

Upgrade haml to 5.0.0 or later.

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-2017-1002201 being exploited?

There is no known exploitation of CVE-2017-1002201 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-2017-1002201, DLA-1986-1, DLA-2864-1, GHSA-r53w-g4xm-3gc6, SNYK-RUBY-HAML-20362, SUSE-SU-2019:2932-1 and 1 more.