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CVE-2026-52769— YesWiki: Unauthenticated Server-Side Request Forgery via ActivityPub `Signature.keyId`

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 是一个用 PHP 编写的 Wiki 系统。从版本 4.6.2 到早于 4.6.6 的版本中， 路由以 对外公开暴露。该路由接受一个 方法会解析该头部，并在进行任何密码学验证或 URL 校验之前，立即向 参数指定的 URL 发起服务器端 HTTP GET 请求。因此，未认证的远程攻击者可以诱导 YesWiki 向服务器能够访问的任意主机发起任意外部 HTTP 请求——例如内部服务、云元数据端点（169.254.169.254）、仅限内网的管理面板等——并通过时序差异和错误信息作为提示（oracle），

CVSS 8.3 · High EPSS 0.07% · P21

Possible ATT&CK Techniques 2 AI

T1522 T1021 · Remote Services
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I. Basic Information for CVE-2026-52769

Vulnerability Information
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Vulnerability Title
YesWiki: Unauthenticated Server-Side Request Forgery via ActivityPub `Signature.keyId`
Source: CVE Program / CVE List V5
Vulnerability Description
YesWiki is a wiki system written in PHP. From version 4.6.2 to before version 4.6.6, the POST /api/forms/{formId}/actor/inbox route - exposed publicly with acl:"public" - accepts an HTTP Signature header whose keyId parameter is a URL. HttpSignatureService::verifySignature() parses the header and immediately makes a server-side HTTP GET to that URL, before any cryptographic verification or URL validation. An unauthenticated remote attacker can therefore make YesWiki issue arbitrary outbound HTTP requests to any host the server can reach - internal services, cloud-metadata endpoints (169.254.169.254), intranet-only admin panels, etc. - and read enough back via timing and error-message oracles to scan ports, enumerate services, and (on a real cloud instance) reach IAM metadata. The only deployment-side precondition is that ActivityPub be enabled on at least one Bazar form. 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:N/UI:N/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
YesWiki yeswiki >= 4.6.2, < 4.6.6 -

II. Public POCs for CVE-2026-52769

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III. Intelligence Information for CVE-2026-52769

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Patches & Fixes for CVE-2026-52769 (1)

Vendor Advisories for CVE-2026-52769 (1)

Other References for CVE-2026-52769 (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-2026-52771 8.3 HIGH YesWiki: Second-Order SQL Injection in Page Delete API via Unescaped Page Tag (`ApiControl
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-918

V. Comments for CVE-2026-52769

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