What is CVE-2026-104458?

CVE-2026-104458 is a medium-severity vulnerability in Yeswiki, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2026-10-02.

How severe is CVE-2026-104458?

Medium severity. CVSS v3 base score is 6.5 out of 10.

SSRF in Yeswiki

CVE-2026-104458

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2026-10-02 · last modified 2026-10-02.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Yeswiki

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

github.com/YesWiki/yeswiki/security/advisories/GHSA-85f2-5r47-2pwm (vendor-advisory)
www.vulncheck.com/advisories/yeswiki-before-4.6.7-ssrf-guard-bypass-via-ipv6-tr… (third-party-advisory)

Frequently asked questions

What is CVE-2026-104458?: CVE-2026-104458 is a medium-severity vulnerability in Yeswiki, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2026-10-02.
How severe is CVE-2026-104458?: Medium severity. CVSS v3 base score is 6.5 out of 10.