CVE-2026-104458

YesWiki before 4.6.7 SSRF Guard Bypass via IPv6 Transition Addresses

8.3 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: Low
Availability: None

Exploit likelihood

0.32%Unchanged since Oct 3, 2026

What each source reports

CVE List Score used 8.3

YesWiki before 4.6.7 SSRF Guard Bypass via IPv6 Transition Addresses

Record: CVE-2026-104458
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness: CWE-918
Updated: 2026-11-02

EUVDEUVD-2026-91469 8.3

Record: EUVD-2026-91469
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-gg34-f95q-rfgp 8.3

YesWiki before 4.6.7 contains a server-side request forgery vulnerability in validateKeyIdUrl()...

Record: GHSA-gg34-f95q-rfgp
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness: CWE-918
Updated: 2026-11-02

NVD 8.3

Record: CVE-2026-104458
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Weakness: CWE-918
Updated: 2026-11-02

OSV 8.3

YesWiki before 4.6.7 SSRF Guard Bypass via IPv6 Transition Addresses

Record: CVE-2026-104458
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-918
Updated: 2026-11-02

Affected products

yeswiki

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-104458 is a high vulnerability (CVSS 8.3) in Yeswiki, published October 2, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 24th percentile. No source names a fixed version.