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CVE-2026-73629— Serendipity before 2.6.0 SSRF via hex IPv4 and IPv6 addresses

Quick assessment

Affected
s9y Serendipity
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

s9y serendipity是s9y个人开发者开源的一款博客发布平台软件。 s9y serendipity 2.6.0之前版本存在服务端请求伪造漏洞，该漏洞源于serendipity_url_allowed()过滤器未能阻止十六进制编码的IPv4地址、IPv6字面量和链路本地范围，可能导致具有adminImagesAdd权限的认证用户绕过过滤器，使用备用地址格式请求内部服务并通过公共上传目录检索响应体。

CVSS 8.5 · High EPSS 0.32% · P25

Affected Version Matrix 2

VendorProduct Version RangeStatus
s9y Serendipity < 2.6.0 affected
2.6.0 unaffected
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I. Basic Information for CVE-2026-73629

Vulnerability Information
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Vulnerability Title
Serendipity before 2.6.0 SSRF via hex IPv4 and IPv6 addresses
Source: CVE Program / CVE List V5
Vulnerability Description
Serendipity before 2.6.0 contains a server-side request forgery vulnerability in the serendipity_url_allowed() filter that fails to block hex-encoded IPv4 addresses, IPv6 literals, and link-local ranges. Authenticated users with adminImagesAdd permission can bypass the filter using alternate address formats to request internal services and retrieve response bodies through the public uploads directory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/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
s9y serendipity 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
s9y serendipity是s9y个人开发者开源的一款博客发布平台软件。 s9y serendipity 2.6.0之前版本存在服务端请求伪造漏洞，该漏洞源于serendipity_url_allowed()过滤器未能阻止十六进制编码的IPv4地址、IPv6字面量和链路本地范围，可能导致具有adminImagesAdd权限的认证用户绕过过滤器，使用备用地址格式请求内部服务并通过公共上传目录检索响应体。
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
s9y Serendipity 0 ~ 2.6.0 -

II. Public POCs for CVE-2026-73629

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6853 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-73629

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Vendor Advisories for CVE-2026-73629 (1)

Other References for CVE-2026-73629 (1)

IV. Related Vulnerabilities

Same product: Serendipity
Same vendor: s9y
Same weakness: CWE-918