{"id":"CVE-2026-48157","aliases":["GHSA-53h4-8rc4-f539"],"url":"https://o3.security/vulnerability/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.","published":"2026-06-15T20:59:23.876Z","modified":"2026-08-12T03:51:26.204699419Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.00167,"percentile":0.0634,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"slim/slim","fixedVersion":"4.15.2"}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:26.204699419Z"}}