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CVE-2026-53607— @apostrophecms/file pretty-URL Vulnerable to Unauthenticated SSRF via Host header

Quick assessment

Affected
apostrophecms apostrophe
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.

apostrophecms是Apostrophecms公司开源的一个内容管理系统。 ApostropheCMS 4.30.0及之前版本存在安全漏洞，该漏洞源于当启用prettyUrls功能时，公开的pretty-URL处理器使用原始的Host HTTP请求标头构建上游URL，可能导致未经身份验证的远程攻击者利用此漏洞发起服务端请求伪造攻击。

CVSS 3.7 · Low EPSS 0.32% · P23

Affected Version Matrix 1

VendorProduct Version RangeStatus
apostrophecms apostrophe <= 4.30.0 affected
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I. Basic Information for CVE-2026-53607

Vulnerability Information
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Vulnerability Title
@apostrophecms/file pretty-URL Vulnerable to Unauthenticated SSRF via Host header
Source: CVE Program / CVE List V5
Vulnerability Description
ApostropheCMS is an open-source Node.js content management system. In versions up to and including 4.30.0, when `prettyUrls: true` is enabled on `@apostrophecms/file` (a documented SEO feature for serving uploaded files at clean URLs), the public pretty-URL handler builds the upstream URL using the raw `Host` HTTP request header. That URL is then `fetch`'ed and the response body + headers are streamed straight back to the requester. Because `Host` is fully attacker-controlled, an unauthenticated remote attacker can pivot the apostrophe process to issue outbound HTTP requests against any host it can reach on the private network. The path component is constrained to `/uploads/attachments/<cuid>-<slug>.<ext>` (built from a local-DB lookup), which keeps the impact narrow: cross-instance data exfiltration is neutralized by cuid uniqueness, but blind-SSRF residuals remain (network-topology mapping via response-code / timing differences and verbose proxy/WAF 404 body disclosure). As of time of publication, no known patched versions exist.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/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
ApostropheCMS 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
apostrophecms是Apostrophecms公司开源的一个内容管理系统。 ApostropheCMS 4.30.0及之前版本存在安全漏洞，该漏洞源于当启用prettyUrls功能时，公开的pretty-URL处理器使用原始的Host HTTP请求标头构建上游URL，可能导致未经身份验证的远程攻击者利用此漏洞发起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
apostrophecms apostrophe <= 4.30.0 -

II. Public POCs for CVE-2026-53607

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III. Intelligence Information for CVE-2026-53607

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Vendor Advisories for CVE-2026-53607 (1)

Same Patch Batch · apostrophecms · 2026-06-12 · 10 CVEs total

CVE-2026-44990 9.3 CRITICAL Apostrophe has default XSS via `xmp` raw-text passthrough in `sanitize-html`
CVE-2026-53609 9.1 CRITICAL Apostrophe has Server-Side Prototype Pollution in apos.util.set via patch operators that l
CVE-2026-53608 8.7 HIGH @apostrophecms/seo Vulnerable to Stored XSS via Unsanitized Google Analytics / GTM ID Inje
CVE-2026-45013 8.1 HIGH Apostrophe has a Weak Password Recovery Mechanism for Forgotten Password and Improper Inpu
CVE-2026-45012 7.6 HIGH Apostrophe has authenticated SSRF in rich-text widget import via @apostrophecms/area/valid
CVE-2026-45011 7.3 HIGH Apostrophe has stored XSS via javascript: URL in Image Widget Link
CVE-2026-42853 6.5 MEDIUM @apostrophecms/cli: Command Injection in apos create via Unsanitized Password Input
CVE-2026-53606 5.4 MEDIUM sanitize-html has an incomplete URI scheme validation that allows javascript: URIs through
CVE-2026-45014 Apostrophe Vulnerable to Stored Cross-Site Scripting via Unsanitized User Display Name in

IV. Related Vulnerabilities

Same product: apostrophe
Same vendor: apostrophecms
Same weakness: CWE-918

V. Comments for CVE-2026-53607

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