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CVE-2026-52792— Algernon: Server-side script source disclosure on Windows via NTFS filename

Quick assessment

Affected
xyproto algernon
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Alexander F. Rødseth algernon是Alexander F. Rødseth个人开发者的一个Web服务器软件。 Alexander F. Rødseth algernon 1.17.9之前版本存在权限许可和访问控制问题漏洞，该漏洞源于Windows系统上通过filepath.Ext()选择文件处理器时未首先拒绝NTFS等效名称，可能导致未认证客户端附加特殊后缀获取原始脚本源码，泄露数据库凭据、API密钥和SetCookieSecret值，并可能伪造会话cookie。

CVSS 8.7 · High EPSS 0.63% · P49

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
xyproto algernon < 1.17.9 affected
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I. Basic Information for CVE-2026-52792

Vulnerability Information
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Vulnerability Title
Algernon: Server-side script source disclosure on Windows via NTFS filename
Source: CVE Program / CVE List V5
Vulnerability Description
Algernon is a small self-contained pure-Go web server. Prior to 1.17.9, Algernon on Windows selects a file handler in engine/handlers.go by calling filepath.Ext() without first rejecting NTFS-equivalent names such as x.lua::$DATA, x.lua., and x.lua . An unauthenticated client can append one of these suffixes to a public server-side script using the .lua, .tl, .po2, .amber, or .frm extension. The request path passes through URL2filename in utils/files.go, skips the renderer and execution cases, and reaches FilePage, os.Open, ReadAndLogErrors, and ToClient, while NTFS resolves the alias to the underlying script. The server consequently returns raw script source and can expose database credentials, API keys, and the SetCookieSecret value, which may permit forged session cookies. Linux and macOS hosts are not affected by this issue. This issue is fixed in version 1.17.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
Windows::DATA交换数据流处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Alexander F. Rødseth algernon 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Alexander F. Rødseth algernon是Alexander F. Rødseth个人开发者的一个Web服务器软件。 Alexander F. Rødseth algernon 1.17.9之前版本存在权限许可和访问控制问题漏洞，该漏洞源于Windows系统上通过filepath.Ext()选择文件处理器时未首先拒绝NTFS等效名称，可能导致未认证客户端附加特殊后缀获取原始脚本源码，泄露数据库凭据、API密钥和SetCookieSecret值，并可能伪造会话cookie。
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
xyproto algernon < 1.17.9 -

II. Public POCs for CVE-2026-52792

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10665 chars
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III. Intelligence Information for CVE-2026-52792

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Patches & Fixes for CVE-2026-52792 (1)

Vendor Advisories for CVE-2026-52792 (1)

Vendor Pages for CVE-2026-52792 (1)

IV. Related Vulnerabilities

Same product: algernon
Same vendor: xyproto
Same weakness: CWE-69

V. Comments for CVE-2026-52792

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