CVE-2026-104458 YesWiki before 4.6.7 SSRF Guard Bypass via IPv6 Transition Addresses
Unauthenticated attackers can bypass SSRF protections in YesWiki using IPv6 transition addresses to access internal services and cloud metadata.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104458?
CVE-2026-104458 is a high-severity server-side request forgery vulnerability in yeswiki, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-104458?
How do I fix CVE-2026-104458?
No fix has been published for CVE-2026-104458 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-104458 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104458 exists.
Sources
Also known as GHSA-85f2-5r47-2pwm, GHSA-gg34-f95q-rfgp.