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CVE-2026-48157— Slim has Reflected XSS in the HtmlErrorRenderer

Quick assessment

Affected
slimphp Slim
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

slimphp Slim是slimphp的一个轻量级PHP开发框架。 Slim 4.4.0版本至4.15.2之前版本存在跨站脚本漏洞，该漏洞源于当应用使用HttpException::setTitle()或setDescription()包含未验证/请求数据时，未转义数据在HTML错误页面中被渲染，可能导致攻击者注入任意HTML/JavaScript。

CVSS 6.1 · Medium EPSS 0.26% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
slimphp Slim >= 4.4.0, < 4.15.2 affected
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I. Basic Information for CVE-2026-48157

Vulnerability Information
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Vulnerability Title
Slim has Reflected XSS in the HtmlErrorRenderer
Source: CVE Program / CVE List V5
Vulnerability Description
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. They 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
slimphp Slim 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
slimphp Slim是slimphp的一个轻量级PHP开发框架。 Slim 4.4.0版本至4.15.2之前版本存在跨站脚本漏洞，该漏洞源于当应用使用HttpException::setTitle()或setDescription()包含未验证/请求数据时，未转义数据在HTML错误页面中被渲染，可能导致攻击者注入任意HTML/JavaScript。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
slimphp Slim >= 4.4.0, < 4.15.2 -

II. Public POCs for CVE-2026-48157

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III. Intelligence Information for CVE-2026-48157

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Vendor Advisories for CVE-2026-48157 (1)

Vendor Pages for CVE-2026-48157 (1)

IV. Related Vulnerabilities

Same product: Slim
Same vendor: slimphp
Same weakness: CWE-79

V. Comments for CVE-2026-48157

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