What is CVE-2026-104445?

CVE-2026-104445 is a high-severity vulnerability in Yeswiki, classified under Authentication Bypass by Spoofing. CVSS score: 8.2/10. Published 2026-10-02.

How severe is CVE-2026-104445?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Yeswiki

CVE-2026-104445

YesWiki before 4.6.7 contains an authentication bypass vulnerability in the ActivityPub inbox that fails to bind the verified HTTP signature signer to the activity actor. Unauthenticated attackers with any ActivityPub keypair can send signed Delete or Update activities referencing a mirrored entry's sourceUrl to delete or overwrite other actors' federated entries.

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

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L.

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-290 — Authentication Bypass by Spoofing

References

github.com/YesWiki/yeswiki/security/advisories/GHSA-rm6r-grfg-4v78 (vendor-advisory)
www.vulncheck.com/advisories/yeswiki-before-4.6.7-authentication-bypass-via-act… (third-party-advisory)

Frequently asked questions

What is CVE-2026-104445?: CVE-2026-104445 is a high-severity vulnerability in Yeswiki, classified under Authentication Bypass by Spoofing. CVSS score: 8.2/10. Published 2026-10-02.
How severe is CVE-2026-104445?: High severity. CVSS v3 base score is 8.2 out of 10.