CVE-2026-5090Medium· 6.1▾ Sunlit

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

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, t…

▾ Sunlit zone — Low / medium · no exploitation signal

Depth score34/ 100 · Low

impact 33.6 · likelihood 0.1 · exploitation 0

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Proof of concept

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Published

May 19, 2026

Updated

Sep 19, 2026

CVSS

6.1

Vendor

—

Product

Template-Toolkit

CWE

CWE-79

Depth score

34 · Low

EPSS

0.29% · p22

Platforms

—

Source

NVD

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

decided 2026-05-20

Exploitation: none
Automatable: no
Technical impact: partial

Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.

EPSS history

Exploit-prediction probability, daily snapshots since Sep 19.

0.3% → 0.3%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

4 events · 124 days

May 19, 2026Published
Disclosed via NVD
Sep 19, 2026Record revised
Last analysed / modified upstream
Sep 19, 2026EPSS first tracked
0.3%
Sep 20, 2026EPSS peak
0.3% → 0.3%

CWE-79 #nvd #cve.org

Affected

Template-Toolkit < 3.103

Full technical detail▾

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#cve.org

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