CVE-2026-27142

MEDIUM

Go html/template - Meta Refresh URL Cross-Site Scripting

Title source: manual

Description

Actions which insert URLs into the content attribute of HTML meta tags are not escaped. This can allow XSS if the meta tag also has an http-equiv attribute with the value "refresh". A new GODEBUG setting has been added, htmlmetacontenturlescape, which can be used to disable escaping URLs in actions in the meta content attribute which follow "url=" by setting htmlmetacontenturlescape=0.

References (4)

Core 4

Core References

Various Sources

https://go.dev/cl/752081

Issue Tracking

https://go.dev/issue/77954

Mailing List

https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk

Various Sources

https://pkg.go.dev/vuln/GO-2026-4603

Scores

CVSS v3 6.1

EPSS 0.0001

EPSS Percentile 2.1%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-79

Status published

Products (4)

Go standard library/html/template < 1.25.8

Go standard library/html/template 1.26.0-0 - 1.26.1

golang/go 1.26.0

golang/go < 1.25.8

Published Mar 06, 2026

Tracked Since Mar 07, 2026