CVE-2026-104463 YesWiki before 4.6.7 Unauthenticated SSRF via ActivityPub Inbox
Unauthenticated attackers can trigger server-side requests to internal hosts or cloud metadata via the ActivityPub Inbox in YesWiki.
- 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-2026-104463?
CVE-2026-104463 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 that allows unauthenticated attackers to trigger server requests by sending signed Follow activities to the public forms actor inbox route. Attackers sign requests with their own keyId while supplying internal actor URLs in the body, reaching internal hosts or cloud metadata via blind GET and POST requests.
Weakness: CWE-918
Which versions are affected by CVE-2026-104463?
How do I fix CVE-2026-104463?
No fix has been published for CVE-2026-104463 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-2026-104463 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104463 exists.
Sources
Also known as GHSA-9xvr-55wh-mcjh, GHSA-x623-wwf6-f6wp.