How severe is GHSA-rq77-p4h8-4crw?

No CVSS score has been assigned to GHSA-rq77-p4h8-4crw yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-rq77-p4h8-4crw?

GHSA-rq77-p4h8-4crw affects the following packages: github.com/gorilla/csrf (Go). Ecosystems affected: Go.

How do I fix GHSA-rq77-p4h8-4crw?

Update github.com/gorilla/csrf to 1.7.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-rq77-p4h8-4crw is resolved across your whole dependency graph.

How do I detect GHSA-rq77-p4h8-4crw in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/gorilla/csrf, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-rq77-p4h8-4crw if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is GHSA-rq77-p4h8-4crw actively exploited in the wild?

No public exploit code has been indexed for GHSA-rq77-p4h8-4crw yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-rq77-p4h8-4crw?

GHSA-rq77-p4h8-4crw has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 32th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-rq77-p4h8-4crw?

GHSA-rq77-p4h8-4crw is classified as Cross-Site Request Forgery (CSRF) (CWE-352). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-rq77-p4h8-4crw published, and has it been updated?

GHSA-rq77-p4h8-4crw was published on April 14, 2025 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

Not in CISA KEV

gorilla/csrf CSRF vulnerability due to broken Referer validationGHSA-rq77-p4h8-4crw

Fix: gorilla/csrf@9dd6af1

GHSA-rq77-p4h8-4crw is a Cross-Site Request Forgery (CSRF) vulnerability in github.com/gorilla/csrf. A fix is available for github.com/gorilla/csrf — see the affected versions and patch details below.

Also known asCVE-2025-24358GO-2025-3607

Published

Apr 14, 2025

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for GHSA-rq77-p4h8-4crw.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs32th percentile — riskier than 32% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐹github.com/gorilla/csrf

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Summary

gorilla/csrf is vulnerable to CSRF via form submission from origins that share a top level domain with the target origin.

Details

gorilla/csrf does not validate the Origin header against an allowlist. Its executes its validation of the Referer header for cross-origin requests only when it believes the request is being served over TLS. It determines this by inspecting the r.URL.Scheme value. However, this value is never populated for "server" requests per the Go spec, and so this check does not run in practice.

	// URL specifies either the URI being requested (for server
	// requests) or the URL to access (for client requests).
	//
	// For server requests, the URL is parsed from the URI
	// supplied on the Request-Line as stored in RequestURI.  For
	// most requests, fields other than Path and RawQuery will be
	// empty. (See [RFC 7230, Section 5.3](https://rfc-editor.org/rfc/rfc7230.html#section-5.3))
	//
	// For client requests, the URL's Host specifies the server to
	// connect to, while the Request's Host field optionally
	// specifies the Host header value to send in the HTTP
	// request.
	URL *[url](https://pkg.go.dev/net/url).[URL](https://pkg.go.dev/net/url#URL)

PoC

create trusted origin target.example.test protected with gorilla/csrf and served over TLS hosting form on /submit
create attacker origin attack.example.test served over TLS
attacker exfiltrates token & cookie combination from target.example.test
attacker sets exfiltrated cookie with domain=.example.test and path=/submit
- as the cookie has a more specific path than / (the default for CSRF cookies) it will be sent first by the browser on submit to our target origin
submit form from attack.example.test with exfiltrated CSRF form token
observe valid form submission as attack.example.test Origin / Referer headers are not validated.

Impact

This vulnerability allows an attacker who has gained XSS on a subdomain or top level domain to perform authenticated form submissions against gorilla/csrf protected targets that share the same top level domain.

This bug has existed in gorilla/csrf since its initial release in 2015.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/gorilla/csrf`	all versions	1.7.3`go get github.com/gorilla/csrf@v1.7.3`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/gorilla/csrf, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/gorilla/csrf to 1.7.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-rq77-p4h8-4crw is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

### Summary gorilla/csrf is vulnerable to CSRF via form submission from origins that share a top level domain with the target origin. ### Details gorilla/csrf does not validate the Origin header against an allowlist. Its executes its validation of the Referer header for cross-origin requests only when it believes the request is being served over TLS. It determines this by inspecting the `r.URL.Scheme` value. However, this value is never populated for "server" requests [per the Go spec](https://pkg.go.dev/net/http#Request), and so this check does not run in practice. ``` // URL specifies e