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CVE-2026-35461— Papra has a Blind Server-Side Request Forgery (SSRF) via Webhook URL

Quick assessment

Affected
papra-hq papra
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.

Papra是Papra开源的一个文档管理与归档平台。 Papra 26.4.0之前版本存在代码问题漏洞，该漏洞源于Papra webhook系统允许经过身份验证的用户注册任意URL作为webhook端点，且未验证目标地址，可能导致服务器在每个文档事件中向注册的URL（包括localhost、内部网络范围和云提供商元数据端点）发出出站HTTP POST请求。

CVSS 5.0 · Medium EPSS 0.30% · P21
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I. Basic Information for CVE-2026-35461

Vulnerability Information
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Vulnerability Title
Papra has a Blind Server-Side Request Forgery (SSRF) via Webhook URL
Source: CVE Program / CVE List V5
Vulnerability Description
Papra is a minimalistic document management and archiving platform. Prior to 26.4.0, the Papra webhook system allows authenticated users to register arbitrary URLs as webhook endpoints with no validation of the destination address. The server makes outbound HTTP POST requests to registered URLs, including localhost, internal network ranges, and cloud provider metadata endpoints, on every document event. This vulnerability is fixed in 26.4.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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
Papra 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Papra是Papra开源的一个文档管理与归档平台。 Papra 26.4.0之前版本存在代码问题漏洞，该漏洞源于Papra webhook系统允许经过身份验证的用户注册任意URL作为webhook端点，且未验证目标地址，可能导致服务器在每个文档事件中向注册的URL（包括localhost、内部网络范围和云提供商元数据端点）发出出站HTTP POST请求。
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
papra-hq papra < 26.4.0 -

II. Public POCs for CVE-2026-35461

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III. Intelligence Information for CVE-2026-35461

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Vendor Advisories for CVE-2026-35461 (1)

Same Patch Batch · papra-hq · 2026-04-07 · 3 CVEs total

CVE-2026-35460 4.3 MEDIUM Papra has an HTML Injection in Transactional Emails via Unescaped User Display Name
CVE-2026-35462 4.3 MEDIUM Papra Does Not Reject Expired API Keys

IV. Related Vulnerabilities

Same product: papra
Same vendor: papra-hq
Same weakness: CWE-918

V. Comments for CVE-2026-35461

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