Haml vulnerable to cross-site scripting

Answer in brief

CVE-2017-1002201 records a Medium severity (CVSS 6.1) vulnerability in Haml vulnerable to cross-site scripting. The current sources do not mark it as known exploited. The current feed maps haml (rubygems). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 21, 2019Updated Sep 10, 2026Source checked Sep 10, 2026First seen by HOL Aug 7, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps haml (rubygems). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
hamlrubygems	>=0 <5.0.0	5.0.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for haml.
Review the reported fix. Update haml to 5.0.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 21, 2019
Evidence: source:osv:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:record
First seen by HOL
Aug 7, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.