Vulnerability · Published Oct 2, 2026 · Assigned by VulnCheck

CVE-2026-104463YesWiki before 4.6.7 Unauthenticated SSRF via ActivityPub Inbox

High 7.0

In plain English

A high-severity server-side request forgery in yeswiki from YesWiki. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 3.1)7.0High

Exploit odds (30 days)0.3%top 83.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
YesWiki	yeswiki	0 – before 4.6.7

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L

References

GitHub Security Advisory (GHSA-x623-wwf6-f6wp) vendor-advisory
VulnCheck Advisory: YesWiki before 4.6.7 Unauthenticated SSRF via ActivityPub Inbox third-party-advisory