VulnerabilityAnalyzed
CVE-2026-27142
This can allow XSS if the meta tag also has an http-equiv attribute with the value "refresh".
MEDIUM 6.1EPSS 0.33%
Does this matter?
Lower severity and a low EPSS score (0.33%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 0.33% probability · 26th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- golang/go
- Source
- security@golang.org
References
- https://go.dev/cl/752081Mailing List
- https://go.dev/issue/77954Issue Tracking
- https://groups.google.com/g/golang-announce/c/EdhZqrQ98hkRelease Notes
- https://pkg.go.dev/vuln/GO-2026-4603Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.