{"items":[{"id":"NVI-00008183","kind":"vulnerability","title":"Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs","revision":5,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-c55v-343g-5xff","CVE-2026-55791"],"plain_summary":"GitHub lists this reviewed advisory for craftcms/cms, craftcms/cms. 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By exploiting the default permissive `trustedHosts` configuration, an attacker can poison the `Host` or `X-Forwarded-Host` header to manipulate the application’s `$baseUrl`. This bypasses the endpoint’s internal URL validation, forcing the backend Guzzle client to fetch a malicious payload from an attacker-controlled server and reflect it to the client with a `Content-Type: application/javascript` header.\n\n**2. Vulnerability Mechanism (Root Cause)**\nThe vulnerability manifests when `assetManager.cacheSourcePaths` is set to `false`. The attack chain relies on three structural flaws and insecure defaults:\n\n- **A. Default Proxy Trust (`trustedHosts`):** Craft’s default `GeneralConfig::$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 `$baseUrl` to the attacker's domain.\n- **B. 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The attack chain relies on three structural flaws and insecure defaults:\n\n- **A. Default Proxy Trust (`trustedHosts`):** Craft’s default `GeneralConfig::$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 `$baseUrl` to the attacker's domain.\n- **B. Insecure HTTP Client (`actionResourceJs`):** In `AppController::actionResou","public_affected_ranges":["ECOSYSTEM: introduced 5.0.0-RC1; fixed 5.10"]},{"certainty":"source_listed","source_ids":["sr-f98836725cae555af2c2fffb2b3e4008"],"technology":"craftcms/cms","known_exclusions":[],"conditions_summary":"**1. Overview**\n\nCraft CMS is vulnerable to Server-Side Request Forgery (SSRF) and Arbitrary JavaScript Injection through the `/actions/app/resource-js` endpoint. By exploiting the default permissive `trustedHosts` configuration, an attacker can poison the `Host` or `X-Forwarded-Host` header to manipulate the application’s `$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.\n\n**2. Vulnerability Mechanism (Root Cause)**\nThe vulnerability manifests when `assetManager.cacheSourcePaths` is set to `false`. The attack chain relies on three structural flaws and insecure defaults:\n\n- **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.\n- **B. Insecure HTTP Client (`actionResourceJs`):** In `AppController::actionResou","public_affected_ranges":["ECOSYSTEM: introduced 4.0.0-RC1; fixed 4.18"]}],"null_published_at":"2026-11-07T07:07:39.838Z","source_updated_at":"2026-06-19T21:15:21.000Z","source_disclosed_at":"2026-06-19T21:15:19.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:42:10.695Z"},{"id":"NVI-00008183","kind":"vulnerability","title":"Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs","revision":4,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-c55v-343g-5xff","CVE-2026-55791"],"plain_summary":"OSV carries this publisher advisory for craftcms/cms, craftcms/cms. 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Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-55791","publisher":"FIRST EPSS","observed_at":"2026-11-04T23:33:33.050Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-f98836725cae555af2c2fffb2b3e4008"],"technology":"craftcms/cms","known_exclusions":[],"conditions_summary":"**1. Overview**\n\nCraft 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 `$baseUrl`. This bypasses the endpoint’s internal URL validation, forcing the backend Guzzle client to fetch a malicious payload from an attacker-controlled server and reflect it to the client with a `Content-Type: application/javascript` header.\n\n**2. 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This allows an attacker to bypass front-end web server (Nginx/Apache) strict `Host` header validations by simply injecting an `X-Forwarded-Host` header. Yii2 will parse this and globally set `$baseUrl` to the attacker's domain.\n- **B. Insecure HTTP Client (`actionResourceJs`):** In `AppController::actionResou","public_affected_ranges":["ECOSYSTEM: introduced 4.0.0-RC1; fixed 4.18"]}],"null_published_at":"2026-11-06T07:24:11.256Z","source_updated_at":"2026-09-10T03:51:08.401Z","source_disclosed_at":"2026-06-19T21:15:19.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:42:10.695Z"},{"id":"NVI-00008183","kind":"vulnerability","title":"Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-c55v-343g-5xff","CVE-2026-55791"],"plain_summary":"OSV carries this publisher advisory for craftcms/cms, craftcms/cms. 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Vulnerability Mechanism (Root Cause)**\nThe vulnerability manifests when `assetManager.cacheSourcePaths` is set to `false`. The attack chain relies on three structural flaws and insecure defaults:\n\n- **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.\n- **B. Insecure HTTP Client (`actionResourceJs`):** In `AppController::actionResou","public_affected_ranges":["ECOSYSTEM: introduced 5.0.0-RC1; fixed 5.10"]},{"certainty":"source_listed","source_ids":["sr-f98836725cae555af2c2fffb2b3e4008"],"technology":"craftcms/cms","known_exclusions":[],"conditions_summary":"**1. 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This report has not examined your application.","related_sources":[{"id":"sr-f98836725cae555af2c2fffb2b3e4008","url":"https://github.com/advisories/GHSA-c55v-343g-5xff","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-c55v-343g-5xff","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:10.695Z"},{"id":"sr-4b1b1b5a785102722a84ac4edf6382c8","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-55791","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.383Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-f98836725cae555af2c2fffb2b3e4008"],"technology":"craftcms/cms","known_exclusions":[],"conditions_summary":"**1. Overview**\n\nCraft 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 `$baseUrl`. This bypasses the endpoint’s internal URL validation, forcing the backend Guzzle client to fetch a malicious payload from an attacker-controlled server and reflect it to the client with a `Content-Type: application/javascript` header.\n\n**2. Vulnerability Mechanism (Root Cause)**\nThe vulnerability manifests when `assetManager.cacheSourcePaths` is set to `false`. The attack chain relies on three structural flaws and insecure defaults:\n\n- **A. Default Proxy Trust (`trustedHosts`):** Craft’s default `GeneralConfig::$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 `$baseUrl` to the attacker's domain.\n- **B. Insecure HTTP Client (`actionResourceJs`):** In `AppController::actionResou","public_affected_ranges":["ECOSYSTEM: introduced 5.0.0-RC1; fixed 5.10"]},{"certainty":"source_listed","source_ids":["sr-f98836725cae555af2c2fffb2b3e4008"],"technology":"craftcms/cms","known_exclusions":[],"conditions_summary":"**1. Overview**\n\nCraft CMS is vulnerable to Server-Side Request Forgery (SSRF) and Arbitrary JavaScript Injection through the `/actions/app/resource-js` endpoint. By exploiting the default permissive `trustedHosts` configuration, an attacker can poison the `Host` or `X-Forwarded-Host` header to manipulate the application’s `$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.\n\n**2. Vulnerability Mechanism (Root Cause)**\nThe vulnerability manifests when `assetManager.cacheSourcePaths` is set to `false`. The attack chain relies on three structural flaws and insecure defaults:\n\n- **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.\n- **B. Insecure HTTP Client (`actionResourceJs`):** In `AppController::actionResou","public_affected_ranges":["ECOSYSTEM: introduced 4.0.0-RC1; fixed 4.18"]}],"null_published_at":"2026-10-31T23:18:17.267Z","source_updated_at":"2026-09-10T03:51:08.401Z","source_disclosed_at":"2026-06-19T21:15:19.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:42:10.695Z"},{"id":"NVI-00008183","kind":"vulnerability","title":"Craft CMS: Blind SSRF and Arbitrary JavaScript Injection via Host Header Poisoning in actionResourceJs","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-c55v-343g-5xff","CVE-2026-55791"],"plain_summary":"OSV carries this publisher advisory for craftcms/cms, craftcms/cms. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 5.10 for craftcms/cms. Confirm the publisher’s latest guidance.","source_ids":["sr-f98836725cae555af2c2fffb2b3e4008"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"The original advisory lists fixed boundaries 4.18 for craftcms/cms. Confirm the publisher’s latest guidance.","source_ids":["sr-f98836725cae555af2c2fffb2b3e4008"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-f98836725cae555af2c2fffb2b3e4008","url":"https://github.com/advisories/GHSA-c55v-343g-5xff","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-c55v-343g-5xff","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:10.695Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-f98836725cae555af2c2fffb2b3e4008"],"technology":"craftcms/cms","known_exclusions":[],"conditions_summary":"**1. Overview**\n\nCraft 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 `$baseUrl`. This bypasses the endpoint’s internal URL validation, forcing the backend Guzzle client to fetch a malicious payload from an attacker-controlled server and reflect it to the client with a `Content-Type: application/javascript` header.\n\n**2. Vulnerability Mechanism (Root Cause)**\nThe vulnerability manifests when `assetManager.cacheSourcePaths` is set to `false`. The attack chain relies on three structural flaws and insecure defaults:\n\n- **A. Default Proxy Trust (`trustedHosts`):** Craft’s default `GeneralConfig::$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 `$baseUrl` to the attacker's domain.\n- **B. Insecure HTTP Client (`actionResourceJs`):** In `AppController::actionResou","public_affected_ranges":["ECOSYSTEM: introduced 5.0.0-RC1; fixed 5.10"]},{"certainty":"source_listed","source_ids":["sr-f98836725cae555af2c2fffb2b3e4008"],"technology":"craftcms/cms","known_exclusions":[],"conditions_summary":"**1. Overview**\n\nCraft CMS is vulnerable to Server-Side Request Forgery (SSRF) and Arbitrary JavaScript Injection through the `/actions/app/resource-js` endpoint. By exploiting the default permissive `trustedHosts` configuration, an attacker can poison the `Host` or `X-Forwarded-Host` header to manipulate the application’s `$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.\n\n**2. Vulnerability Mechanism (Root Cause)**\nThe vulnerability manifests when `assetManager.cacheSourcePaths` is set to `false`. The attack chain relies on three structural flaws and insecure defaults:\n\n- **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.\n- **B. Insecure HTTP Client (`actionResourceJs`):** In `AppController::actionResou","public_affected_ranges":["ECOSYSTEM: introduced 4.0.0-RC1; fixed 4.18"]}],"null_published_at":"2026-10-31T22:13:22.833Z","source_updated_at":"2026-09-10T03:51:08.401Z","source_disclosed_at":"2026-06-19T21:15:19.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:42:10.695Z"}],"next_cursor":null,"snapshot_revision":"42594"}