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CVE-2026-49996— securedrop-proxy origin limitation can be bypassed with redirects

Quick assessment

Affected
freedomofpress securedrop-client
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.

Freedom of the Press Foundation SecureDrop Inbox是Freedom of the Press Foundation组织的一款保护匿名来源的加密安全收件箱。 Freedom of the Press Foundation SecureDrop Inbox 1.3.1之前版本存在输入验证错误漏洞，该漏洞源于恶意SecureDrop Server通过响应跨域重定向绕过securedrop-proxy的源限制，可能导致绕过源限制。

CVSS 3.7 · Low EPSS 0.31% · P23

Affected Version Matrix 1

VendorProduct Version RangeStatus
freedomofpress securedrop-client < 1.3.1 affected
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I. Basic Information for CVE-2026-49996

Vulnerability Information
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Vulnerability Title
securedrop-proxy origin limitation can be bypassed with redirects
Source: CVE Program / CVE List V5
Vulnerability Description
SecureDrop Client is a desktop app for journalists to securely communicate with sources and handle submissions on the SecureDrop Workstation. Prior to version 1.3.1, a malicious SecureDrop Server could bypass securedrop-proxy's origin limitation by responding with cross-origin redirects. SecureDrop Server itself has multiple layers of built-in hardening, and is a dedicated physical machine exposed on the internet only via Tor hidden services for the Source and Journalist interfaces, and optionally via remote SSH access over another Tor hidden service. A newsroom's SecureDrop Workstation communicates only with its own dedicated SecureDrop Server. Version 1.3.1 fixes the issue.
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
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Freedom of the Press Foundation SecureDrop Inbox 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Freedom of the Press Foundation SecureDrop Inbox是Freedom of the Press Foundation组织的一款保护匿名来源的加密安全收件箱。 Freedom of the Press Foundation SecureDrop Inbox 1.3.1之前版本存在输入验证错误漏洞，该漏洞源于恶意SecureDrop Server通过响应跨域重定向绕过securedrop-proxy的源限制，可能导致绕过源限制。
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
freedomofpress securedrop-client < 1.3.1 -

II. Public POCs for CVE-2026-49996

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III. Intelligence Information for CVE-2026-49996

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Patches & Fixes for CVE-2026-49996 (1)

Vendor Advisories for CVE-2026-49996 (1)

IV. Related Vulnerabilities

Same product: securedrop-client
Same vendor: freedomofpress
Same weakness: CWE-601

V. Comments for CVE-2026-49996

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