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| Vulnerability ID | VCID-gzry-xtu5-ukhu |
| Aliases |
CVE-2026-41130
GHSA-95wr-3f2v-v2wh |
| Summary | Craft CMS has a host header injection leading to SSRF via resource-js endpoint ### Summary The `resource-js` endpoint in Craft CMS allows unauthenticated requests to proxy remote JavaScript resources. When `trustedHosts` is not explicitly restricted (default configuration), the application trusts the client-supplied Host header. This allows an attacker to control the derived `baseUrl`, which is used in prefix validation inside `actionResourceJs()`. By supplying a malicious Host header, the attacker can make the server issue arbitrary HTTP requests, leading to Server-Side Request Forgery (SSRF). ### Details The vulnerability exists in `AppController::actionResourceJs()`. The function validates that the `url` parameter starts with `assetManager->baseUrl`. However, `baseUrl` is derived from the current request host. If `trustedHosts` is not configured, the Host header is fully attacker-controlled. Attack chain: 1. Attacker sends request with controlled `Host` header. 2. Application derives `baseUrl` from the malicious Host. 3. `url` parameter is required to start with this `baseUrl`. 4. Validation passes. 5. Guzzle performs a server-side HTTP request to the attacker-controlled host. 6. SSRF occurs. This does not rely on string parsing bypass. It relies on Host header trust. ### PoC (safe reproduction steps) Environment: - Craft CMS 5.9.12 - Default configuration (no trustedHosts restriction) - Docker deployment 1. Start a listener inside the container: python3 -m http.server 9999 2. Send a request to resource-js with a controlled Host header. 3. Observe that the internal listener receives a request (OOB confirmation). |
| Status | Published |
| Exploitability | None |
| Weighted Severity | None |
| Risk | None |
| Affected and Fixed Packages | Package Details |
| System | Score | Found at |
|---|---|---|
| epss | 0.00051 | https://api.first.org/data/v1/epss?cve=CVE-2026-41130 |
| cvssv4 | 5.5 | https://github.com/craftcms/cms |
| generic_textual | MODERATE | https://github.com/craftcms/cms |
| cvssv4 | 5.5 | https://github.com/craftcms/cms/commit/ebe7e85f1c89700d64332f72492be2e9a594e783 |
| generic_textual | MODERATE | https://github.com/craftcms/cms/commit/ebe7e85f1c89700d64332f72492be2e9a594e783 |
| ssvc | Track | https://github.com/craftcms/cms/commit/ebe7e85f1c89700d64332f72492be2e9a594e783 |
| cvssv4 | 5.5 | https://github.com/craftcms/cms/security/advisories/GHSA-95wr-3f2v-v2wh |
| generic_textual | MODERATE | https://github.com/craftcms/cms/security/advisories/GHSA-95wr-3f2v-v2wh |
| ssvc | Track | https://github.com/craftcms/cms/security/advisories/GHSA-95wr-3f2v-v2wh |
| cvssv4 | 5.5 | https://nvd.nist.gov/vuln/detail/CVE-2026-41130 |
| generic_textual | MODERATE | https://nvd.nist.gov/vuln/detail/CVE-2026-41130 |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Attack Requirements (AT) | Privileges Required (PR) | User Interaction (UI) | Vulnerable System Impact Confidentiality (VC) | Vulnerable System Impact Integrity (VI) | Vulnerable System Impact Availability (VA) | Subsequent System Impact Confidentiality (SC) | Subsequent System Impact Integrity (SI) | Subsequent System Impact Availability (SA) |
|---|---|---|---|---|---|---|---|---|---|---|
network adjacent local physical |
low high |
none present |
none low high |
none passive active |
high low none |
high low none |
high low none |
high low none |
high low none |
high low none |
| Percentile | 0.1631 |
| EPSS Score | 0.00051 |
| Published At | June 5, 2026, 12:55 p.m. |
| Date | Actor | Action | Source | VulnerableCode Version |
|---|---|---|---|---|
| 2026-06-04T16:52:03.391053+00:00 | GithubOSV Importer | Import | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-95wr-3f2v-v2wh/GHSA-95wr-3f2v-v2wh.json | 38.6.0 |