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CVE-2026-104454— YesWiki before 4.6.7 ReDoS via wakka.php Edit-Preview Endpoint

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 版本之前存在一个算法复杂度拒绝服务漏洞。该漏洞位于 wakka.php 格式化程序中，原因是其处理 Markdown 链接的正则表达式具有 O(n^2) 的时间复杂度。未经身份验证的攻击者可以向页面编辑预览接口提交一个精心构造的、包含少量方括号的请求体，从而导致 PHP-FPM 工作进程被长时间占用，并使整个进程池饱和。

CVSS 5.3 · Medium EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

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-2026-104454

Vulnerability Information
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Vulnerability Title
YesWiki before 4.6.7 ReDoS via wakka.php Edit-Preview Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
YesWiki before 4.6.7 contains an algorithmic-complexity denial of service in the wakka.php formatter due to an O(n^2) markdown-link regex. Unauthenticated attackers can submit a small crafted body of bracket characters to the page-edit preview endpoint to pin PHP-FPM workers and saturate the pool.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
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-2026-104454

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III. Intelligence Information for CVE-2026-104454

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Vendor Advisories for CVE-2026-104454 (2)

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-2026-104445 8.2 HIGH YesWiki before 4.6.7 Authentication Bypass via ActivityPub Inbox Actor Spoofing
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-2026-104462 7.5 HIGH YesWiki before 4.6.7 SQL Injection via nuagetag tags parameter
CVE-2026-104472 7.5 HIGH YesWiki before 4.6.7 Missing Authorization via Attachment Download Handler
CVE-2026-104460 7.5 HIGH YesWiki before 4.6.7 Unauthenticated Blind SQL Injection via newtextsearch
CVE-2026-104470 7.4 HIGH YesWiki before 4.6.7 SSRF and XSS via Bazar valeur Action
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-2026-104450 6.5 MEDIUM YesWiki before 4.6.7 ACL Bypass and Stored XSS via pointimage Action
CVE-2026-104449 6.5 MEDIUM YesWiki before 4.6.7 Unauthenticated Page Overwrite via Bazar id_fiche
CVE-2026-104458 6.5 MEDIUM YesWiki before 4.6.7 SSRF Guard Bypass via IPv6 Transition Addresses
CVE-2026-104446 6.5 MEDIUM YesWiki before 4.6.7 Unauthenticated Open Mail Relay via Contact Mail Handler

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

IV. Related Vulnerabilities

Same product: yeswiki
Same vendor: YesWiki
Same weakness: CWE-1333

V. Comments for CVE-2026-104454

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