---
title: "CVE-2026-104445: YesWiki - Authentication Bypass"
description: "YesWiki < 4.6.7 contains an authentication bypass caused by failure to bind verified HTTP signature signer to activity actor in ActivityPub inbox, letting unauthenticated attackers delete or overwrite federated entries, exploit requires attacker to have any ActivityPub keypair."
url: https://panop.io/threat-heartbeat/CVE-2026-104445/
---

# CVE-2026-104445 YesWiki - Authentication Bypass

YesWiki < 4.6.7 contains an authentication bypass caused by failure to bind verified HTTP signature signer to activity actor in ActivityPub inbox, letting unauthenticated attackers delete or overwrite federated entries, exploit requires attacker to have any ActivityPub keypair.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.40% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-104445)

## Details

Type

Authentication Bypass

Impact

Broken Access Control, Data Tampering

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

Published

2 October 2026

Updated

15 October 2026

Weakness

[CWE-290](https://cwe.mitre.org/data/definitions/290.html)

## Vendor fix

Update to version 4.6.7 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-104445](https://nvd.nist.gov/vuln/detail/CVE-2026-104445)
- [https://github.com/YesWiki/yeswiki/security/advisories/GHSA-rm6r-grfg-4v78](https://github.com/YesWiki/yeswiki/security/advisories/GHSA-rm6r-grfg-4v78)
- [https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-authentication-bypass-via-activitypub-inbox-actor-spoofing](https://www.vulncheck.com/advisories/yeswiki-before-4.6.7-authentication-bypass-via-activitypub-inbox-actor-spoofing)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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