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Krytyczna

Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs

  • Ujawniono: 19.06.2026
  • Aktualizacja: 11.10.2026 10:22

1. Overview

Craft CMS is vulnerable to Server-Side Request Forgery (SSRF) and Arbitrary JavaScript Injection through the /actions/app/resource-js endpoint. By exploiting the default permissive trustedHosts configuration, an attacker can poison the Host or X-Forwarded-Host header to manipulate the application’s $baseUrl. This bypasses the endpoint’s internal URL validation, forcing the backend Guzzle client to fetch a malicious payload from an attacker-controlled server and reflect it to the client with a Content-Type: application/javascript header.

2. Vulnerability Mechanism (Root Cause) The vulnerability manifests when assetManager.cacheSourcePaths is set to false. The attack chain relies on three structural flaws and insecure defaults:

  • A. Default Proxy Trust (trustedHosts): Craft’s default GeneralConfig::$trustedHosts is set to ['any']. This allows an attacker to bypass front-end web server (Nginx/Apache) strict Host header validations by simply injecting an X-Forwarded-Host header. Yii2 will parse this and globally set $baseUrl to the attacker's domain.
  • B. Insecure HTTP Client (actionResourceJs): In AppController::actionResourceJs(), the str_starts_with($url, $baseUrl) validation is bypassed because $baseUrl is already poisoned by the attacker. The core then uses Craft::createGuzzleClient()->get($url). Unlike the GraphQL Asset fetcher, this Guzzle instance defaults to ALLOW_REDIRECTS => true.
  • C. Forced JS Content-Type: The response fetched from the attacker's server is blindly returned to the user via $this->asRaw() with the header Content-Type: application/javascript.

3. Attack Scenario & Impact (Proof of Exploitability) This endpoint acts as a proxy, taking remote, unverified content and serving it as valid JavaScript. While the direct SSRF allows for internal network probing, the most devastating impact occurs when caching layers are involved.

If the Craft CMS instance is behind a caching layer, this vulnerability leads directly to Web Cache Poisoning:

  1. An unauthenticated attacker sends the poisoned request.
  2. The caching layer caches the malicious JavaScript response for the legitimate /actions/app/resource-js URI.
  3. When an authenticated Administrator logs into the Control Panel, their browser loads the poisoned cached JavaScript (Stored XSS).
  4. The malicious script extracts window.Craft.csrfTokenValue and silently sends a POST request to /admin/actions/plugins/install-plugin, achieving 1-Click Remote Code Execution (RCE) via Session Riding.

Czego dotyczy

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PlatformaPaczkaPodatne wersjePoprawka w wersji
Paczka Composer craftcms/cms >= 5.0.0-RC1, < 5.10, >= 4.0.0-RC1, < 4.18 5.10, 4.18

Odnośniki

Ocena CVSS -
Wektor CVSS
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N
Słabość (CWE)
CWE-346
Platforma
Composer
Paczka
craftcms/cms
Ujawniono
19.06.2026
Aktualizacja
11.10.2026 10:22

Źródła i licencje

OSV / GitHub Advisory Database - GHSA-c55v-343g-5xff - CC BY 4.0

Historia podatności: craftcms/cms

Wszystkie opisane podatności tej paczki (Paczka Composer), od najnowszej. Widać, czy to jednorazowa wpadka, czy paczka, której trzeba pilnować.

Wszystkie (127) w archiwum
Wszystkich wpisów
127
Pierwsza → ostatnia
07.2021 08.2026
Bez poprawki
6
Wykorzystywana w atakach
4

Rozkład istotności

  • Krytyczna 9
  • Wysoka 41
  • Średnia 65
  • Niska 12

Ujawnienia w latach

Istotność:
  1. Craft CMS: Passkey login accepts replayed WebAuthn assertions
    Krytyczna CVE-2026-72780 >= 5.0.0-RC1, < 5.10.5 5.10.5
  2. Craft CMS: Arbitrary user password reset leading to administrator account takeover
    Wysoka CVE-2026-72786 >= 5.0.0-RC1, < 5.10.8 5.10.8
  3. Craft CMS: Authenticated RCE through Twig sandbox escape
    Wysoka CVE-2026-72781 >= 5.0.0-RC1, < 5.10.7, >= 4.0.0-RC1, < 4.18.3 5.10.7, 4.18.3
  4. Craft CMS: Authenticated RCE via `condition.config` JSON cleanse bypass
    Wysoka CVE-2026-72778 >= 5.0.0-RC1, < 5.10.6, >= 4.0.0-RC1, < 4.18.2 5.10.6, 4.18.2
  5. Craft CMS: RCE via missing cleanseConfig in FieldsController::actionRenderCardPreview
    Wysoka CVE-2026-56382 >= 5.5.0, < 5.9.14 5.9.14
  6. Craft CMS: Potential authenticated Remote Code Execution via referrer redirect
    Wysoka CVE-2026-55794 >= 5.9.0, < 5.10.0 5.10.0
  7. Craft CMS: DOM XSS via GitHub issue title in CraftSupport widget
    Wysoka CVE-2026-55790 >= 5.0.0-RC1, < 5.9.23, >= 4.0.0-RC1, < 4.17.16 5.9.23, 4.17.16
  8. Craft CMS Vulnerable to Unauthorized Deletion of Destination Folders During Forced Moves
    Wysoka CVE-2026-50282 >= 5.0.0-RC1, < 5.9.21, >= 4.0.0-RC1, < 4.17.14 5.9.21, 4.17.14
  9. Craft CMS's mass assignment via id in newAttributes during bulk duplicate overwrites existing elements
    Wysoka CVE-2026-50281 >= 5.7.0, < 5.9.21 5.9.21
  10. Craft CMS: Missing peer-permission check in `AssetsController::actionDeleteFolder` allows deletion of other users' assets
    Wysoka CVE-2026-50284 >= 5.0.0-RC1, < 5.9.22, >= 4.0.0-RC1, < 4.17.15 5.9.22, 4.17.15
  11. Craft CMS: Authorship spoofing in `entries/save-entry` via pre-check/post-mutation authorization gap
    Wysoka CVE-2026-50279 >= 5.0.0-RC1, < 5.9.21 5.9.21
  12. Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs ten wpis
    Krytyczna CVE-2026-55791 >= 5.0.0-RC1, < 5.10, >= 4.0.0-RC1, < 4.18 5.10, 4.18
  13. Craft CMS's Missing Volume Permission Check in AssetsController::actionShowInFolder Allows Information Disclosure
    Wysoka CVE-2026-44012 >= 5.0.0-RC1, < 5.9.18 5.9.18
  14. Craft CMS has Potential Authenticated Remote Code Execution via Malicious Attached Behavior
    Wysoka CVE-2026-44011 >= 4.0.0, < 4.17.12, >= 5.0.0, < 5.9.18 4.17.12, 5.9.18
  15. Craft CMS's Missing Authorization in GraphQL Address Resolver Allows Cross-Scope PII Disclosure
    Wysoka CVE-2026-44010 >= 5.0.0, < 5.9.18, >= 4.0.0, < 4.17.12 5.9.18, 4.17.12
  16. Craft CMS is Vulnerable to Authenticated Remote Code Execution via Malicious Attached Behavior
    Wysoka CVE-2026-33157 >= 5.6.0, < 5.9.13 5.9.13
  17. Craft CMS Vulnerable to Privilege Escalation/Bypass through UsersController->actionImpersonateWithToken()
    Wysoka CVE-2026-32267 >= 4.0.0-RC1, < 4.17.6, >= 5.0.0-RC1, < 5.9.12 4.17.6, 5.9.12
  18. Craft CMS vulnerable to behavior injection RCE ElementIndexesController and FieldsController
    Wysoka CVE-2026-32264 >= 4.0.0-RC1, < 4.17.5, >= 5.0.0-RC1, < 5.9.11 4.17.5, 5.9.11
  19. Craft CMS vulnerable to behavior injection RCE via EntryTypesController
    Wysoka CVE-2026-32263 >= 5.6.0, < 5.9.11 5.9.11
  20. CraftCMS has an RCE vulnerability via relational conditionals in the control panel
    Wysoka CVE-2026-31857 >= 5.0.0-RC1, < 5.9.9, >= 4.0.0-beta.1, < 4.17.4 5.9.9, 4.17.4
  21. CraftCMS's `ElementSearchController` Affected by Blind SQL Injection
    Wysoka CVE-2026-31858 >= 5.0.0-RC1, < 5.9.9 5.9.9
  22. Craft CMS has unauthenticated activation email trigger with potential user enumeration
    Wysoka CVE-2026-29069 >= 5.0.0-RC1, < 5.9.0-beta.2, >= 4.0.0-RC1, < 4.17.0-beta.2 5.9.0-beta.2, 4.17.0-beta.2
  23. Craft CMS Vulnerable to Authenticated RCE via "craft.app.fs.write()" in Twig Templates
    Krytyczna CVE-2026-28697 >= 5.0.0-RC1, < 5.9.0-beta.1, >= 4.0.0-RC1, < 4.17.0-beta.1 5.9.0-beta.1, 4.17.0-beta.1
  24. Craft CMS has IDOR via GraphQL @parseRefs
    Wysoka CVE-2026-28696 >= 4.0.0-RC1, < 4.17.0-beta.1, >= 5.0.0-RC1, < 5.9.0-beta.1 4.17.0-beta.1, 5.9.0-beta.1
  25. Craft CMS has Cloud Metadata SSRF Protection Bypass via DNS Rebinding
    Wysoka CVE-2026-27127 >= 5.0.0-RC1, < 5.8.23, >= 3.5.0, < 4.16.19 5.8.23, 4.16.19
  26. Craft CMS Vulnerable to potential authenticated Remote Code Execution via malicious attached Behavior
    Wysoka CVE-2026-25498 >= 5.0.0-RC1, < 5.8.22, >= 4.0.0-RC1, < 4.16.18 5.8.22, 4.16.18
  27. Craft CMS: GraphQL Asset Mutation Privilege Escalation
    Wysoka CVE-2026-25497 >= 5.0.0-RC1, < 5.9.0-beta.1, >= 4.0.0-RC1, < 4.17.0-beta.1 5.9.0-beta.1, 4.17.0-beta.1
  28. Craft CMS Vulnerable to SQL Injection in Element Indexes via `criteria[orderBy]`
    Wysoka CVE-2026-25495 >= 5.0.0-RC1, < 5.8.22, >= 4.0.0-RC1, < 4.16.18 5.8.22, 4.16.18
  29. Craft CMS vulnerable to potential authenticated Remote Code Execution via malicious attached Behavior
    Wysoka CVE-2025-68455 >= 5.0.0-RC1, < 5.8.21, >= 4.0.0-RC1, < 4.16.17 5.8.21, 4.16.17
  30. Unauthenticated Craft CMS users can trigger a database backup
    Wysoka CVE-2025-68456 >= 5.0.0-RC1, < 5.8.21, >= 3.0.0, < 4.16.17 5.8.21, 4.16.17
  31. Craft CMS Contains a Potential Remote Code Execution Vulnerability via Twig SSTI
    Wysoka CVE-2025-46731 >= 4.0.0-RC1, < 4.14.13, >= 5.0.0-RC1, < 5.6.15 4.14.13, 5.6.15
  32. Craft CMS Allows Remote Code Execution
    Krytyczna · 10.0 Wykorzystywana w atakach CVE-2025-32432 >= 3.0.0-RC1, < 3.9.15, >= 4.0.0-RC1, < 4.14.15, >= 5.0.0-RC1, < 5.6.17 3.9.15, 4.14.15, 5.6.17
  33. Craft CMS has a potential RCE with a compromised security key
    Wysoka · 8.0 Wykorzystywana w atakach CVE-2025-23209 >= 5.0.0-RC1, < 5.5.8, >= 4.0.0-RC1, < 4.13.8 5.5.8, 4.13.8
  34. Craft CMS has potential RCE when PHP `register_argc_argv` config setting is enabled
    Krytyczna · 9.8 Wykorzystywana w atakach CVE-2024-56145 >= 5.0.0-RC1, < 5.5.2, >= 4.0.0-RC1, < 4.13.2, >= 3.0.0, < 3.9.14 5.5.2, 4.13.2, 3.9.14
  35. Craft CMS vulnerable to Potential Remote Code Execution via missing path normalization & Twig SSTI
    Wysoka · 7.2 CVE-2024-52293 >= 4.0.0-RC1, < 4.12.2, >= 5.0.0-RC1, < 5.4.3 4.12.2, 5.4.3
  36. Craft CMS Arbitrary System File Read
    Wysoka · 7.7 CVE-2024-52292 >= 5.0.0-alpha.1, < 5.4.9, >= 3.5.13, < 4.12.8 5.4.9, 4.12.8
  37. Local File System Validation Bypass Leading to File Overwrite, Sensitive File Access, and Potential Code Execution
    Wysoka · 8.4 CVE-2024-52291 >= 5.0.0-RC1, < 5.4.6, >= 4.0.0-RC1, < 4.12.5 5.4.6, 4.12.5
  38. Craft CMS SQL injection vulnerability via the GraphQL API endpoint
    Krytyczna · 9.8 CVE-2024-37843 <= 3.7.31 brak poprawki
  39. Craft CMS Feed-Me
    Wysoka · 7.5 CVE-2023-36260 < 4.6.2 4.6.2
  40. Craft CMS Remote Code Execution vulnerability
    Krytyczna · 10.0 CVE-2023-41892 >= 4.0.0-RC1, < 4.4.15 4.4.15
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