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CVE-2026-27567— Payload has Server-Side Request Forgery (SSRF) in External File URL Uploads

Quick assessment

Affected
payloadcms payload
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.

Payload CMS是Payload开源的一个内容管理系统。 Payload CMS 3.75.0之前版本存在代码问题漏洞，该漏洞源于外部文件上传功能中对HTTP重定向的验证不足，可能导致服务端请求伪造攻击。

CVSS 6.5 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-27567

Vulnerability Information
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Vulnerability Title
Payload has Server-Side Request Forgery (SSRF) in External File URL Uploads
Source: CVE Program / CVE List V5
Vulnerability Description
Payload is a free and open source headless content management system. Prior to 3.75.0, a Server-Side Request Forgery (SSRF) vulnerability exists in Payload's external file upload functionality. When processing external URLs for file uploads, insufficient validation of HTTP redirects could allow an authenticated attacker to access internal network resources. The Payload environment must have at least one collection with `upload` enabled and a user who has `create` access to that upload-enabled collection in order to be vulnerable. An authenticated user with upload collection write permissions could potentially access internal services. Response content from internal services could be retrieved through the application. This vulnerability has been patched in v3.75.0. As a workaround, one may mitigate this vulnerability by disabling external file uploads via the `disableExternalFile` upload collection option, or by restricting `create` access on upload-enabled collections to trusted users only.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Payload CMS 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Payload CMS是Payload开源的一个内容管理系统。 Payload CMS 3.75.0之前版本存在代码问题漏洞，该漏洞源于外部文件上传功能中对HTTP重定向的验证不足，可能导致服务端请求伪造攻击。
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
payloadcms payload < 3.75.0 -

II. Public POCs for CVE-2026-27567

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III. Intelligence Information for CVE-2026-27567

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Patches & Fixes for CVE-2026-27567 (1)

IV. Related Vulnerabilities

Same product: payload
Same vendor: payloadcms
Same weakness: CWE-918

V. Comments for CVE-2026-27567

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