CVE-2026-52792Public exploitNetwork attack vectorHinoki check available

Script source disclosure via NTFS filename aliases

Published Aug 19, 2026 · Updated Aug 19, 2026

Information disclosure in Algernon before 1.17.9 on Windows allows remote attackers to read script source via NTFS-equivalent filenames. In engine/handlers.go, FilePage chooses handling from filepath.Ext() after URL2filename in utils/files.go passes colons, trailing dots, and trailing spaces, so names such as x.lua::$DATA skip the script-execution path and fall through to os.Open and ToClient. Exposure requires a Windows host serving public .lua, .tl, .po2, .amber, or .frm files; disclosed source can reveal database credentials, API keys, and SetCookieSecret values that support forged session cookies.

CVSS severity8.7
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Information disclosure in Algernon before 1.17.9 on Windows allows remote attackers to read script source via NTFS-equivalent filenames. In engine/handlers.go, FilePage chooses handling from filepath.Ext() after URL2filename in utils/files.go passes colons, trailing dots, and trailing spaces, so names such as x.lua::$DATA skip the script-execution path and fall through to os.Open and ToClient. Exposure requires a Windows host serving public .lua, .tl, .po2, .amber, or .frm files; disclosed source can reveal database credentials, API keys, and SetCookieSecret values that support forged session cookies.

The record

CVE
CVE-2026-52792
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
xyproto
Product
Algernon
Classifications
CWE-69, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.17.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

xyproto · Algernonversion=< 1.17.9

Published CVSS scores

8.7GitHub_MCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-69Improper Handling of Windows ::DATA Alternate Data Stream
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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