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CVE-2025-46721— nosurf vulnerable to CSRF due to non-functional same-origin request checks

Quick assessment

Affected
justinas nosurf
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.

nosurf是Justinas Stankevičius个人开发者的一个用于 Go 的 HTTP 包。可帮助您防止跨站点请求伪造攻击。 nosurf 1.2.0之前版本存在安全漏洞，该漏洞源于CSRF检查绕过，可能导致跨站请求伪造。

AI Predicted 9.1 Difficulty: Easy EPSS 0.23% · P14
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I. Basic Information for CVE-2025-46721

Vulnerability Information
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Vulnerability Title
nosurf vulnerable to CSRF due to non-functional same-origin request checks
Source: CVE Program / CVE List V5
Vulnerability Description
nosurf is cross-site request forgery (CSRF) protection middleware for Go. A vulnerability in versions prior to 1.2.0 allows an attacker who controls content on the target site, or on a subdomain of the target site (either via XSS, or otherwise) to bypass CSRF checks and issue requests on user's behalf. Due to misuse of the Go `net/http` library, nosurf categorizes all incoming requests as plain-text HTTP requests, in which case the `Referer` header is not checked to have the same origin as the target webpage. If the attacker has control over HTML contents on either the target website (e.g. `example.com`), or on a website hosted on a subdomain of the target (e.g. `attacker.example.com`), they will also be able to manipulate cookies set for the target website. By acquiring the secret CSRF token from the cookie, or overriding the cookie with a new token known to the attacker, `attacker.example.com` is able to craft cross-site requests to `example.com`. A patch for the issue was released in nosurf 1.2.0. In lieu of upgrading to a patched version of nosurf, users may additionally use another HTTP middleware to ensure that a non-safe HTTP request is coming from the same origin (e.g. by requiring a `Sec-Fetch-Site: same-origin` header in the request).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
nosurf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nosurf是Justinas Stankevičius个人开发者的一个用于 Go 的 HTTP 包。可帮助您防止跨站点请求伪造攻击。 nosurf 1.2.0之前版本存在安全漏洞，该漏洞源于CSRF检查绕过，可能导致跨站请求伪造。
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
justinas nosurf < 1.2.0 -

II. Public POCs for CVE-2025-46721

# POC Description Source Link Shenlong Link
1 None https://github.com/justinas/nosurf-cve-2025-46721 POC Details
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III. Intelligence Information for CVE-2025-46721

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Patches & Fixes for CVE-2025-46721 (1)

Vendor Advisories for CVE-2025-46721 (1)

IV. Related Vulnerabilities

Same weakness: CWE-352

V. Comments for CVE-2025-46721

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