Answer in brief
CVE-2026-5090 records a Medium severity (CVSS 6.1) vulnerability in Template::Plugin::HTML versions before 3.103 for Perl allows HTML and JavaScript to be injected. The current sources do not mark it as known exploited. The current feed maps Template-Toolkit (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
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.
The current feed maps Template-Toolkit (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Template-Toolkitgeneric | >=0 <3.103 | 3.103 |
Published upstream
May 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 19, 2026
Template::Plugin::HTML versions before 3.103 for Perl allows HTML and JavaScript to be injected. The html_filter function did not escape single quotes. HTML attributes inside of single quotes could be have code injected. For example, the variable "var" in <a id='ref' title='[% var | html %]'> would not be properly escaped. An attacker could insert some limited HTML and JavaScript, for example, var = " ' onclick='while (true) { alert(1) }'" Note that arbitrary HTML and JavaScript would be difficult to inject, because angle brackets, ampersands and double-quotes would still be escaped.
Quoted source text, attributed separately from HOL analysis.