Template::Plugin::HTML versions before 3.103 for Perl allows HTML and JavaScript to be injected

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-5090
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-19 22:16:39 UTC
Updated2026-09-19 12:16:39 UTC
DescriptionTemplate::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.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from ADP

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

EPSS: 0.002920000 probability, percentile 0.219830000 (date 2026-09-21)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

References

ReferenceSourceLinkTags
github.com/abw/Template2/issues/327 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
www.openwall.com/lists/oss-security/2026/05/19/40 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/cpan-authors/Template2/commit/ca539f49f6ffd1c2b7d9ef4f48f6b88... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
metacpan.org/release/TODDR/Template-Toolkit-3.103/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
github.com/abw/Template2/pull/337/changes/11c78a7a771d4af505efeb754a0b87... MITRE github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2024-12-01T00:00:00.000ZIssue reported in GitHub.
CNA2026-02-21T00:00:00.000ZPull request submitted.
CNA2026-03-22T00:00:00.000ZPull request merged.
CNA2026-03-22T00:00:00.000ZIssue reported to CPANSec.
CNA2026-03-28T00:00:00.000ZCVE assigned.
CNA2026-05-19T00:00:00.000ZCVE published.
CNA2026-05-21T00:00:00.000ZTemplate-Toolkit version 3.103 released.

Solutions

CNA: Upgrade to version 3.103.

Workarounds

CNA: Attribute values in templates that contain escaped HTML should use double quotes instead of single quotes.

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