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CVE-2026-104445— YesWiki before 4.6.7 Authentication Bypass via ActivityPub Inbox Actor Spoofing

Quick assessment

Affected
YesWiki yeswiki
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

YesWiki 4.6.7 之前的版本中存在一个活动Pub（ActivityPub）收件箱的身份验证绕过漏洞，该漏洞未能将经过验证的HTTP签名者与活动发起者（actor）进行正确绑定。拥有任意 ActivityPub 密钥对的未授权攻击者可以发送带有签名的“删除”或“更新”活动，这些活动引用镜像条目的 sourceUrl，从而删除或覆盖其他活动发起者 federated 条目。

CVSS 8.2 · High EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
YesWiki yeswiki < 4.6.7 affected
4.6.7 unaffected
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I. Basic Information for CVE-2026-104445

Vulnerability Information
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Vulnerability Title
YesWiki before 4.6.7 Authentication Bypass via ActivityPub Inbox Actor Spoofing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
YesWiki yeswiki 0 ~ 4.6.7 -

II. Public POCs for CVE-2026-104445

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III. Intelligence Information for CVE-2026-104445

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Vendor Advisories for CVE-2026-104445 (1)

Other References for CVE-2026-104445 (1)

Same Patch Batch · YesWiki · 2026-10-02 · 36 CVEs total

CVE-2026-104457 8.6 HIGH YesWiki before 4.6.7 SQL Injection via filtertags filterN parameter
CVE-2026-104464 8.6 HIGH YesWiki before 4.6.7 SSRF via Bazar abonnements sync actor parameter
CVE-2026-104448 8.1 HIGH YesWiki before 4.6.7 CSRF Page Deletion via ajaxdeletepage Handler
CVE-2026-104467 8.1 HIGH YesWiki before 4.6.7 Authorization Bypass via Public API Mode
CVE-2026-104443 8.1 HIGH YesWiki before 4.6.7 Scope Bypass via Triples Delete API
CVE-2026-104456 7.6 HIGH YesWiki before 4.6.7 Second-Order SQL Injection via ACL Username
CVE-2026-104460 7.5 HIGH YesWiki before 4.6.7 Unauthenticated Blind SQL Injection via newtextsearch
CVE-2026-104472 7.5 HIGH YesWiki before 4.6.7 Missing Authorization via Attachment Download Handler
CVE-2026-104462 7.5 HIGH YesWiki before 4.6.7 SQL Injection via nuagetag tags parameter
CVE-2026-104471 7.2 HIGH YesWiki before 4.6.7 Unrestricted File Upload via Bazar CSV Import
CVE-2026-104444 7.1 HIGH YesWiki before 4.6.7 Authorization Bypass via Comments API editComment
CVE-2026-104447 7.1 HIGH YesWiki before 4.6.7 CSRF Package Deletion via autoupdate UpdateAction
CVE-2026-104463 7.0 HIGH YesWiki before 4.6.7 Unauthenticated SSRF via ActivityPub Inbox
CVE-2026-104469 6.8 MEDIUM YesWiki before 4.6.7 Session Fixation via Login in AuthController.php
CVE-2026-104459 6.5 MEDIUM YesWiki before 4.6.7 SSRF via ActivityPub WebFinger actor_handle
CVE-2026-104449 6.5 MEDIUM YesWiki before 4.6.7 Unauthenticated Page Overwrite via Bazar id_fiche
CVE-2026-104446 6.5 MEDIUM YesWiki before 4.6.7 Unauthenticated Open Mail Relay via Contact Mail Handler
CVE-2026-104458 6.5 MEDIUM YesWiki before 4.6.7 SSRF Guard Bypass via IPv6 Transition Addresses
CVE-2026-104450 6.5 MEDIUM YesWiki before 4.6.7 ACL Bypass and Stored XSS via pointimage Action
CVE-2026-104473 6.1 MEDIUM YesWiki before 4.5.3 Multiple Reflected XSS via BazaR and listpages

Showing top 20 of 36 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: yeswiki
Same vendor: YesWiki
Same weakness: CWE-290

V. Comments for CVE-2026-104445

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