CVE-2026-104463

YesWiki before 4.6.7 Unauthenticated SSRF via ActivityPub Inbox

8.3 High

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.

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: Low

Exploit likelihood

0.25%Unchanged since Oct 3, 2026

What each source reports

CVE List Score used 8.3

YesWiki before 4.6.7 Unauthenticated SSRF via ActivityPub Inbox

Record: CVE-2026-104463
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS 3.1: 7.0 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
Weakness: CWE-918
Updated: 2026-11-02

EUVDEUVD-2026-91474 8.3

Record: EUVD-2026-91474
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-9xvr-55wh-mcjh 8.3

YesWiki before 4.6.7 contains a server-side request forgery vulnerability that allows...

Record: GHSA-9xvr-55wh-mcjh
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/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: 7.0 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
Weakness: CWE-918
Updated: 2026-11-02

NVD 8.3

Record: CVE-2026-104463
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/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: 7.0 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:L
Weakness: CWE-918
Updated: 2026-11-02

OSV 8.3

YesWiki before 4.6.7 Unauthenticated SSRF via ActivityPub Inbox

Record: CVE-2026-104463
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/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-2026-104463 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 0.25%, the 16th percentile. No source names a fixed version.