Server-Side Request Forgery in YesWiki Affects Cloud Metadata Access
CVE-2026-104458

8.3HIGH

Key Information:

Vendor

Yeswiki

Status
Yeswiki
Vendor
CVE Published:
2 October 2026

What is CVE-2026-104458?

YesWiki prior to version 4.6.7 is susceptible to a server-side request forgery vulnerability in the validateKeyIdUrl() function. This flaw enables unauthenticated attackers to circumvent server-side request forgery (SSRF) protections by manipulating the Signature keyId. Through various IP address formats, such as 6to4, NAT64, or IPv4-compatible IPv6 addresses, attackers can target the public actor inbox route. This exploitation could lead to unauthorized access to sensitive cloud metadata, loopback services, or even internal hosts, thereby posing a serious risk to the integrity of affected systems.

Affected Version(s)

yeswiki 0 < 4.6.7

yeswiki 4.6.7

References

https://github.com/YesWiki/yeswiki/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/yeswiki-before-4.6.7...
third-party-advisory

CVSS V4

Score:
8.3
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

tonghuaroot
.