{"id":"CVE-2024-24753","aliases":["EUVD-2024-0590","GHSA-99f9-gv72-fw9r"],"status":"published","title":"Bref Multiple Value Headers Not Supported in ApiGatewayFormatV2","description":"Bref enable serverless PHP on AWS Lambda. When Bref is used in combination with an API Gateway with the v2 format, it does not handle multiple values headers. If PHP generates a response with two headers having the same key but different values only the latest one is kept. If an application relies on multiple headers with the same key being set for security reasons, then Bref would lower the application security. For example, if an application sets multiple `Content-Security-Policy` headers, then Bref would just reflect the latest one. This vulnerability is patched in 2.1.13.","severity":{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00426,"percentile":0.37299,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-436"],"published":"2024-02-01T16:09:55Z","modified":"2026-10-28T02:30:50Z","fixes":[{"ecosystem":"Packagist","package":"bref/bref","fixed_in":["2.1.13"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"bref/bref","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.13"}]}]},{"source":"osv","ecosystem":"Packagist","package":"bref/bref","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.13"}]}],"versions":["0.1.0","0.2.0","0.2.1","0.2.10","0.2.11","0.2.12","0.2.13","0.2.14","0.2.15","0.2.16","0.2.17","0.2.18","0.2.19","0.2.2","0.2.20","0.2.21","0.2.22","0.2.23","0.2.24","0.2.25","0.2.26","0.2.27","0.2.28","0.2.29","0.2.3","0.2.30","0.2.31","0.2.32","0.2.33","0.2.34","0.2.35","0.2.36","0.2.37","0.2.4","0.2.5","0.2.6","0.2.7","0.2.8","0.2.9","0.3.0","0.3.1","0.3.2","0.3.3","0.3.4","0.3.5","0.3.6","0.3.7","0.3.8","0.3.9","0.4.0","0.4.1","0.5.0","0.5.0-beta1","0.5.1","0.5.10","0.5.11","0.5.12","0.5.13","0.5.14","0.5.14-beta1","0.5.14-beta2","0.5.15","0.5.16","0.5.17","0.5.18","0.5.19","0.5.2","0.5.20","0.5.21","0.5.22","0.5.23","0.5.24","0.5.25","0.5.26","0.5.27","0.5.28","0.5.29","0.5.3","0.5.30","0.5.31","0.5.32","0.5.33","0.5.4","0.5.5","0.5.6","0.5.6-beta1","0.5.7","0.5.8","0.5.9","1.0.0","1.0.0-beta1","1.0.0-beta2","1.0.1","1.0.2","1.1.0","1.1.1","1.1.2","1.1.3","1.1.4","1.2.0","1.2.1","1.2.10","1.2.11","1.2.12","1.2.13","1.2.14","1.2.2","1.2.3","1.2.4","1.2.5","1.2.6","1.2.7","1.2.8","1.2.9","1.3.0","1.3.1","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","1.4.0","1.4.1","1.4.2","1.5.0","1.5.1","1.5.2","1.5.3","1.5.4","1.5.5","1.5.6","1.5.7","1.5.8","1.6.0","1.7.0","1.7.1","1.7.10","1.7.11","1.7.12","1.7.13","1.7.14","1.7.15","1.7.16","1.7.17","1.7.18","1.7.19","1.7.2","1.7.20","1.7.21","1.7.22","1.7.23","1.7.24","1.7.25","1.7.26","1.7.27","1.7.28","1.7.29","1.7.3","1.7.30","1.7.31","1.7.32","1.7.33","1.7.34","1.7.35","1.7.36","1.7.37","1.7.38","1.7.39","1.7.4","1.7.40","1.7.41","1.7.42","1.7.43","1.7.44","1.7.45","1.7.46","1.7.47","1.7.5","1.7.6","1.7.7","1.7.8","1.7.9","2.0.0","2.0.0-beta1","2.0.0-beta10","2.0.0-beta11","2.0.0-beta12","2.0.0-beta13","2.0.0-beta14","2.0.0-beta15","2.0.0-beta16","2.0.0-beta17","2.0.0-beta2","2.0.0-beta3","2.0.0-beta4","2.0.0-beta5","2.0.0-beta6","2.0.0-beta7","2.0.0-beta8","2.0.0-beta9","2.0.1","2.0.10","2.0.11","2.0.2","2.0.3","2.0.4","2.0.5","2.0.6","2.0.7","2.0.8","2.0.9","2.1.0","2.1.1","2.1.10","2.1.11","2.1.12","2.1.2","2.1.3","2.1.4","2.1.5","2.1.6","2.1.7","2.1.8","2.1.9"]}],"products":[{"vendor":"brefphp","product":"bref"},{"vendor":"mnapoli","product":"bref"}],"references":[{"url":"https://github.com/brefphp/bref/security/advisories/GHSA-99f9-gv72-fw9r","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Vendor Advisory","advisory","web"]},{"url":"https://github.com/brefphp/bref/commit/f834027aaf88b3885f4aa8edf6944ae920daf2dc","tags":["x_refsource_MISC","x_transferred","Patch","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-24753","tags":["advisory"]},{"url":"https://github.com/brefphp/bref/blob/2.1.12/src/Event/Http/HttpResponse.php#L61-L90","tags":["web"]},{"url":"https://github.com/advisories/GHSA-99f9-gv72-fw9r"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/24xxx/CVE-2024-24753.json","tags":["advisory"]},{"url":"https://github.com/brefphp/bref","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2024-24753","title":"Bref Multiple Value Headers Not Supported in ApiGatewayFormatV2","description":"Bref enable serverless PHP on AWS Lambda. When Bref is used in combination with an API Gateway with the v2 format, it does not handle multiple values headers. If PHP generates a response with two headers having the same key but different values only the latest one is kept. If an application relies on multiple headers with the same key being set for security reasons, then Bref would lower the application security. For example, if an application sets multiple `Content-Security-Policy` headers, then Bref would just reflect the latest one. This vulnerability is patched in 2.1.13.","status":"published","published":"2024-02-01T16:09:55.328Z","modified":"2025-06-17T14:36:33.763Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:34:13.991836Z"}],"euvd":[{"id":"EUVD-2024-0590","description":"Bref enable serverless PHP on AWS Lambda. When Bref is used in combination with an API Gateway with the v2 format, it does not handle multiple values headers. If PHP generates a response with two headers having the same key but different values only the latest one is kept. If an application relies on multiple headers with the same key being set for security reasons, then Bref would lower the application security. For example, if an application sets multiple `Content-Security-Policy` headers, then Bref would just reflect the latest one. This vulnerability is patched in 2.1.13.","status":"published","published":"2024-02-01T16:09:55Z","modified":"2025-06-17T14:36:33Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T20:32:22.732364Z"}],"ghsa":[{"id":"GHSA-99f9-gv72-fw9r","title":"Bref Doesn't Support Multiple Value Headers in ApiGatewayFormatV2","description":"## Impacted Resources\n\nbref/src/Event/Http/HttpResponse.php:61-90\n\n## Description\n\nWhen Bref is used in combination with an API Gateway with the v2 format, it does not handle multiple values headers.\n\nPrecisely, if PHP generates a response with two headers having the same key but different values only the latest one is kept.\n\n## Impact\n\nIf an application relies on multiple headers with the same key being set for security reasons, then Bref would lower the application security.\n\nFor example, if an application sets multiple `Content-Security-Policy` headers, then Bref would just reflect the latest one.\n\n## PoC\n\n1. Create a new Bref project.\n2. Create an `index.php` file with the following content:\n```php\n\u003c?php\nheader(\"Content-Security-Policy: script-src 'none'\", false);\nheader(\"Content-Security-Policy: img-src 'self'\", false);\n?\u003e\n\u003cscript\u003ealert(document.domain)\u003c/script\u003e\n\u003cimg src=\"https://bref.sh/favicon-32x32.png\"\u003e\n```\n3. Use the following `serverless.yml` to deploy the Lambda:\n```yaml\nservice: app\n\nprovider:\n    name: aws\n    region: eu-central-1\n\nplugins:\n    - ./vendor/bref/bref\n\nfunctions:\n    api:\n        handler: index.php\n        description: ''\n        runtime: php-81-fpm\n        timeout: 28 # in seconds (API Gateway has a timeout of 29 seconds)\n        events:\n            -   httpApi: '*'\n\n# Exclude files from deployment\npackage:\n    patterns:\n        - '!node_modules/**'\n        - '!tests/**'\n```\n4. Browse the Lambda URL.\n5. Notice that the JavaScript code is executed as the `Content-Security-Policy: script-src 'none'` header has been removed.\n6. Notice that the external image has not been loaded as the `Content-Security-Policy: img-src 'self'` header has been kept.\n7. Start a PHP server inside the project directory (e.g. `php -S 127.0.0.1:8090`).\n8. Browse the `index.php` script through the PHP server (e.g. http://127.0.0.1:8090/index.php).\n9. Notice that the JavaScript code is not executed as the `Content-Security-Policy: script-src 'none'` header has been kept.\n10. Notice that the external image has not been loaded as the `Content-Security-Policy: img-src 'self'` header has been kept.\n\n## Suggested Remediation\n\nConcatenate all the multiple value headers' values with a comma (`,`) as separator and return a single header with all the values to the API Gateway.\n\n## References\n\n- https://www.rfc-editor.org/rfc/rfc9110.html#section-5.2","status":"published","published":"2024-02-01T20:53:08Z","modified":"2024-02-01T20:53:11Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:37:34.405364Z"}],"nvd":[{"id":"CVE-2024-24753","description":"Bref enable serverless PHP on AWS Lambda. When Bref is used in combination with an API Gateway with the v2 format, it does not handle multiple values headers. If PHP generates a response with two headers having the same key but different values only the latest one is kept. If an application relies on multiple headers with the same key being set for security reasons, then Bref would lower the application security. For example, if an application sets multiple `Content-Security-Policy` headers, then Bref would just reflect the latest one. This vulnerability is patched in 2.1.13.","status":"published","published":"2024-02-01T16:17:14.69Z","modified":"2026-06-17T07:14:47.427Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:09:34.891666Z"}],"osv":[{"id":"CVE-2024-24753","title":"Bref Multiple Value Headers Not Supported in ApiGatewayFormatV2","description":"Bref enable serverless PHP on AWS Lambda. When Bref is used in combination with an API Gateway with the v2 format, it does not handle multiple values headers. If PHP generates a response with two headers having the same key but different values only the latest one is kept. If an application relies on multiple headers with the same key being set for security reasons, then Bref would lower the application security. For example, if an application sets multiple `Content-Security-Policy` headers, then Bref would just reflect the latest one. This vulnerability is patched in 2.1.13.","status":"published","published":"2024-02-01T16:09:55.328Z","modified":"2026-10-28T02:30:50.897939097Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T15:44:38.897406Z"},{"id":"GHSA-99f9-gv72-fw9r","title":"Bref Doesn't Support Multiple Value Headers in ApiGatewayFormatV2","description":"## Impacted Resources\n\nbref/src/Event/Http/HttpResponse.php:61-90\n\n## Description\n\nWhen Bref is used in combination with an API Gateway with the v2 format, it does not handle multiple values headers.\n\nPrecisely, if PHP generates a response with two headers having the same key but different values only the latest one is kept.\n\n## Impact\n\nIf an application relies on multiple headers with the same key being set for security reasons, then Bref would lower the application security.\n\nFor example, if an application sets multiple `Content-Security-Policy` headers, then Bref would just reflect the latest one.\n\n## PoC\n\n1. Create a new Bref project.\n2. Create an `index.php` file with the following content:\n```php\n\u003c?php\nheader(\"Content-Security-Policy: script-src 'none'\", false);\nheader(\"Content-Security-Policy: img-src 'self'\", false);\n?\u003e\n\u003cscript\u003ealert(document.domain)\u003c/script\u003e\n\u003cimg src=\"https://bref.sh/favicon-32x32.png\"\u003e\n```\n3. Use the following `serverless.yml` to deploy the Lambda:\n```yaml\nservice: app\n\nprovider:\n    name: aws\n    region: eu-central-1\n\nplugins:\n    - ./vendor/bref/bref\n\nfunctions:\n    api:\n        handler: index.php\n        description: ''\n        runtime: php-81-fpm\n        timeout: 28 # in seconds (API Gateway has a timeout of 29 seconds)\n        events:\n            -   httpApi: '*'\n\n# Exclude files from deployment\npackage:\n    patterns:\n        - '!node_modules/**'\n        - '!tests/**'\n```\n4. Browse the Lambda URL.\n5. Notice that the JavaScript code is executed as the `Content-Security-Policy: script-src 'none'` header has been removed.\n6. Notice that the external image has not been loaded as the `Content-Security-Policy: img-src 'self'` header has been kept.\n7. Start a PHP server inside the project directory (e.g. `php -S 127.0.0.1:8090`).\n8. Browse the `index.php` script through the PHP server (e.g. http://127.0.0.1:8090/index.php).\n9. Notice that the JavaScript code is not executed as the `Content-Security-Policy: script-src 'none'` header has been kept.\n10. Notice that the external image has not been loaded as the `Content-Security-Policy: img-src 'self'` header has been kept.\n\n## Suggested Remediation\n\nConcatenate all the multiple value headers' values with a comma (`,`) as separator and return a single header with all the values to the API Gateway.\n\n## References\n\n- https://www.rfc-editor.org/rfc/rfc9110.html#section-5.2","status":"published","published":"2024-02-01T20:53:08Z","modified":"2026-09-10T03:50:06.17550793Z","cvss":[{"version":"3.1","score":4.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T15:46:43.524801Z"}]}}