CVE-2026-39823 — MEDIUM (6.1)

Vulnerability Description

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.

CVSS Score

6.1

MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Affected Products

Vendor	Product	Versions
Golang	Go	< 1.25.10

Related Weaknesses (CWE)

CWE-79

References

https://go.dev/cl/769920Patch
https://go.dev/issue/78913Issue Tracking
https://groups.google.com/g/golang-announce/c/qcCIEXso47MRelease Notes
https://pkg.go.dev/vuln/GO-2026-4982Vendor Advisory

FAQ

What is CVE-2026-39823?

CVE-2026-39823 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 insi...

How severe is CVE-2026-39823?

CVE-2026-39823 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-39823?

Check the references section above for vendor advisories and patch information. Affected products include: Golang Go.