CVE-2026-56858CWE-79cross-site-scripting

CVE-2026-56858

Medium · published August 14, 2026

CVSS v3.1
6.1
EPSS
0%
Percentile
22.6
In the wild
Unconfirmed
What it is

Previously, pathological inputs could close an unescaped '/' early, allowing for attack-controlled data to inject arbitrary content, potentially leading to XSS.

The record
Technical detail
CVSS v3.1
6.1 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00310 · 22.6th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-08-14T02:17Z
References (4)
https://go.dev/cl/807100 · [email protected]https://go.dev/issue/80435 · [email protected]https://groups.google.com/g/golang-announce/c/94pEornpRlI · [email protected]https://pkg.go.dev/vuln/GO-2026-6091 · [email protected]
EPSS history
Timeline
  • 13 AUG 21:58Z
    Fix Javascript regexp context tracking in html/template
    cvelistv5