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CVE Vulnerability Details :
CVE-2026-39823
PUBLISHED
More InfoOfficial Page
Assigner-Go
Assigner Org ID-1bb62c36-49e3-4200-9d77-64a1400537cc
View Known Exploited Vulnerability (KEV) details
Published At-07 May, 2026 | 19:41
Updated At-08 May, 2026 | 14:05
Rejected At-
▼CVE Numbering Authority (CNA)
Bypass of meta content URL escaping causes XSS in html/template

CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS.

Affected Products
Vendor
Go standard library
Product
html/template
Collection URL
https://pkg.go.dev
Package Name
html/template
Program Routines
  • tMetaContent
  • Template.Execute
  • Template.ExecuteTemplate
Default Status
unaffected
Versions
Affected
  • From 0 before 1.25.10 (semver)
  • From 1.26.0-0 before 1.26.3 (semver)
Problem Types
TypeCWE IDDescription
N/AN/ACWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Type: N/A
CWE ID: N/A
Description: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Samy Ghannad
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://go.dev/issue/78913
N/A
https://go.dev/cl/769920
N/A
https://groups.google.com/g/golang-announce/c/qcCIEXso47M
N/A
https://pkg.go.dev/vuln/GO-2026-4982
N/A
Hyperlink: https://go.dev/issue/78913
Resource: N/A
Hyperlink: https://go.dev/cl/769920
Resource: N/A
Hyperlink: https://groups.google.com/g/golang-announce/c/qcCIEXso47M
Resource: N/A
Hyperlink: https://pkg.go.dev/vuln/GO-2026-4982
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
3.16.1MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Version: 3.1
Base score: 6.1
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found