---
id: CVE-2026-104458
title: >-
  YesWiki before 4.6.7 contains a server-side request forgery vulnerability in
  validateKeyIdUrl() that allows unauthenticated attackers to bypass the SSRF
  guard using 6to4, NAT64, or IPv4-compatible IPv6 addresses
summary: >-
  YesWiki before 4.6.7 contains a server-side request forgery vulnerability in
  validateKeyIdUrl() that allows unauthenticated attackers to bypass the SSRF
  guard using 6to4, NAT64, or IPv4-compatible IPv6 addresses. Attackers can send
  a cra…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-918
vendor: YesWiki
product: yeswiki
affected:
  - yeswiki < 4.6.7
published: '2026-10-02'
updated: '2026-10-02'
sourceUpdated: '2026-10-02T12:17:17.927'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-104458'
references:
  - url: 'https://github.com/YesWiki/yeswiki/security/advisories/GHSA-85f2-5r47-2pwm'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-ssrf-guard-bypass-via-ipv6-transition-addresses
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-02T12:17:44.342Z'
---

## Overview

YesWiki before 4.6.7 contains a server-side request forgery vulnerability in validateKeyIdUrl() that allows unauthenticated attackers to bypass the SSRF guard using 6to4, NAT64, or IPv4-compatible IPv6 addresses. Attackers can send a crafted Signature keyId to the public actor inbox route to reach cloud metadata, loopback services, or internal hosts.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.