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CVE-2026-52771— YesWiki: Second-Order SQL Injection in Page Delete API via Unescaped Page Tag (`ApiController::deletePage`)

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是法国YesWiki组织开源的一个面向团队的协作式内容管理平台。 YesWiki 4.2.0版本至4.6.6之前版本存在SQL注入漏洞，该漏洞源于ApiController::deletePage()函数在构造DELETE FROM …_links WHERE to_tag = '$tag'查询时未对页面标签进行转义，攻击者可利用POST /api/pages/{tag} API创建包含SQL片段的标签，并调用删除接口在wiki数据库中执行任意SQL，可能导致时间型盲注数据泄露。

CVSS 8.3 · High EPSS 0.51% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
YesWiki yeswiki >= 4.2.0, < 4.6.6 affected
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I. Basic Information for CVE-2026-52771

Vulnerability Information
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Vulnerability Title
YesWiki: Second-Order SQL Injection in Page Delete API via Unescaped Page Tag (`ApiController::deletePage`)
Source: CVE Program / CVE List V5
Vulnerability Description
YesWiki is a wiki system written in PHP. From version 4.2.0 to before version 4.6.6, ApiController::deletePage() interpolates a page tag retrieved from the database into a DELETE FROM …_links WHERE to_tag = '$tag' query without escaping. The page tag is attacker-controlled — the POST /api/pages/{tag} API accepts arbitrary URL-encoded values, including single quotes, and stores them. A low-privilege authenticated user can therefore create a page whose tag is a SQL fragment, make the page non-orphaned via the standard {{include page="…"}} link mechanism, and then invoke the delete endpoint to execute arbitrary SQL inside the wiki database - including time-based blind data exfiltration from any table. This issue has been patched in version 4.6.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
SQL命令中使用的特殊元素转义处理不恰当(SQL注入)
Source: CVE Program / CVE List V5
Vulnerability Title
YesWiki SQL注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
YesWiki是法国YesWiki组织开源的一个面向团队的协作式内容管理平台。 YesWiki 4.2.0版本至4.6.6之前版本存在SQL注入漏洞，该漏洞源于ApiController::deletePage()函数在构造DELETE FROM …_links WHERE to_tag = '$tag'查询时未对页面标签进行转义，攻击者可利用POST /api/pages/{tag} API创建包含SQL片段的标签，并调用删除接口在wiki数据库中执行任意SQL，可能导致时间型盲注数据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
YesWiki yeswiki >= 4.2.0, < 4.6.6 -

II. Public POCs for CVE-2026-52771

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III. Intelligence Information for CVE-2026-52771

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Patches & Fixes for CVE-2026-52771 (1)

Vendor Advisories for CVE-2026-52771 (1)

Other References for CVE-2026-52771 (1)

Same Patch Batch · YesWiki · 2026-09-04 · 12 CVEs total

CVE-2026-52777 9.4 CRITICAL YesWiki: Authenticated PHP Object Injection in BazarImportAction via unserialize
CVE-2026-52766 9.1 CRITICAL YesWiki: Unauthenticated arbitrary page deletion via `{{erasespamedcomments}}` action
CVE-2026-52775 8.8 HIGH YesWiki Authenticated SQL Injection in ReactionManager
CVE-2026-52769 8.3 HIGH YesWiki: Unauthenticated Server-Side Request Forgery via ActivityPub `Signature.keyId`
CVE-2026-52767 8.2 HIGH YesWiki: Unauthenticated ActivityPub Signature-Verification Bypass via `!openssl_verify(..
CVE-2026-52770 7.5 HIGH Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') in ye
CVE-2026-52762 7.1 HIGH YesWiki: Authenticated (Admin) Server-Side Template Injection to Remote Code Execution via
CVE-2026-52763 6.5 MEDIUM YesWiki: SQL injection via the `recentchanges` action `period` argument leading to arbitra
CVE-2026-52773 6.1 MEDIUM Reflected XSS via Unescaped Archived-Revision `time` Parameter in `handlers/page/show.php`
CVE-2026-52774 6.1 MEDIUM Reflected XSS via Unescaped `id` Parameter in Bazar Widget HTML Attributes in YesWiki
CVE-2026-52772 5.5 MEDIUM YesWiki: Bazar form-field templates still apply `|raw('html')` to `field.label` / `field.h

IV. Related Vulnerabilities

Same product: yeswiki
Same vendor: YesWiki
Same weakness: CWE-89