CVE-2026-55087— Etherpad x-proxy-path头反射致XSS及开放重定向漏洞
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一、 漏洞 CVE-2026-55087 基础信息
漏洞信息
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Vulnerability Title
Etherpad: x-proxy-path header reflected into admin HTML/JS/CSS (cache-poisoning XSS) and concatenated into redirect (open-redirect)
来源: CVE Program / CVE List V5
Vulnerability Description
Etherpad is a real-time collaborative editor. From 2.1.0 until 3.1.0, Etherpad uses the attacker-controlled x-proxy-path request header in src/node/hooks/express/admin.ts when substituting paths into HTML, JavaScript, and CSS under /admin without sanitization, Vary: x-proxy-path, or Cache-Control: private, no-store. A shared proxy or CDN can cache the resulting response and serve attacker-injected script to an administrator. In src/node/hooks/express/specialpages.ts, version 3.0.0 also accepts a protocol-relative x-proxy-path value when constructing the /p/:pad/timeslider redirect, allowing redirection to an attacker-controlled host. The issues are exploitable when the deployment permits client-supplied x-proxy-path headers to reach Etherpad. This issue is fixed in version 3.1.0.
来源: 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
来源: 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)
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-55087 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|---|---|---|
| 1 | Etherpad versions 2.1.0 through 3.0.0 reflect the x-proxy-path request header into admin HTML, JavaScript, and CSS responses without sanitization. An attacker can abuse this behavior to inject crafted content into generated resource URLs, enabling cross-site scripting and cache poisoning scenarios. | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-55087.yaml | POC详情 |
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CVE-2026-55087 补丁与修复 (1)
CVE-2026-55087 厂商安全公告 (1)
同批安全公告 · ether · 2026-08-19 · 共 6 条
| CVE-2026-55089 | 9.9 CRITICAL | Etherpad JWT管理员权限绕过漏洞 |
| CVE-2026-55085 | 9.6 CRITICAL | Etherpad Lite 跨站脚本漏洞 |
| CVE-2026-55088 | 6.8 MEDIUM | Etherpad 设备间作者令牌传输端点重放漏洞 |
| CVE-2026-55090 | 5.3 MEDIUM | Etherpad HTML导出未转义属性池值导致的存储型XSS漏洞 |
| CVE-2026-55086 | 4.2 MEDIUM | Etherpad 临时文件路径可预测导致符号链接文件覆盖漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-55087
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