{"id":"CVE-2026-48157","summary":"Slim has Reflected XSS in the HtmlErrorRenderer","details":"Slim is a PHP micro framework that enables users to write simple web applications and APIs. In versions 4.4.0 through 4.15, if an application uses HttpException::setTitle() and/or setDescription() to include untrusted/request-derived data in the error title or description (e.g. \"No products found matching '{$query}'.\"), an attacker could inject arbitrary HTML/JavaScript that executes in the victim's browser when they encounter an HTML error page generated by Slim. The vulnerability is present even with displayErrorDetails = false as the unescaped title and description are rendered on this error path. Built-in exceptions (HttpNotFoundException, HttpBadRequestException, etc.) ship plain-text defaults, so a vanilla Slim app with no user code is not exploitable. Only applications that feed untrusted data into setTitle() and/or setDescription() are affected. The issue has been fixed in 4.15.2. If developers are unable to immediately update their applications, they can work around this issue by avoiding passing untrusted/request-derived data into HttpException::setTitle() and setDescription() and using static, plain-text error copy instead.\nThey should also register a custom error renderer (an ErrorRendererInterface implementation, or a subclass of HtmlErrorRenderer that escapes the title and description) for the HTML media type.","aliases":["GHSA-53h4-8rc4-f539"],"modified":"2026-08-04T11:30:56.273333418Z","published":"2026-06-15T20:59:23.876Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48157.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-79"]},"references":[{"type":"WEB","url":"https://github.com/slimphp/Slim/releases/tag/4.15.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48157.json"},{"type":"ADVISORY","url":"https://github.com/slimphp/Slim/security/advisories/GHSA-53h4-8rc4-f539"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48157"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/slimphp/slim","events":[{"introduced":"207acac048652a35d4762a737d59e317aedc02df"},{"fixed":"e12cb05ca2a14e8f459d019e87a31dc915b80470"}],"database_specific":{"extracted_events":[{"introduced":"4.4.0"},{"fixed":"4.15.2"}],"source":"AFFECTED_FIELD"}}],"versions":["4.15.1","4.15.0","4.14.0","4.13.0","4.12.0","4.11.0","4.10.0","4.9.0","4.8.1","4.8.0","4.7.1","4.7.0","4.6.0","4.5.0","4.4.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48157.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}