CVE-2026-104445 YesWiki before 4.6.7 Authentication Bypass via ActivityPub Inbox Actor Spoofing
Unauthenticated attackers can delete or overwrite federated entries in YesWiki by spoofing ActivityPub actors due to missing signature binding.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104445?
CVE-2026-104445 is a high-severity authentication bypass vulnerability in yeswiki, published on 2 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-290
Which versions are affected by CVE-2026-104445?
How do I fix CVE-2026-104445?
No fix has been published for CVE-2026-104445 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-104445 being exploited?
There is no known exploitation of CVE-2026-104445 in the wild and no public exploit code.
Sources
Also known as GHSA-px48-25j6-h73c, GHSA-rm6r-grfg-4v78.