CVE-2026-52877Public exploitNetwork attack vector

File and handler launch via unchecked URL scheme

Published Aug 18, 2026 · Updated Aug 19, 2026

Improper input validation in Streambert before 2.6.0 allows attackers to launch local handlers or open files via crafted URLs. The open-external IPC handler in src/ipc/downloads.js passes a renderer-supplied URL directly to Electron's shell.openExternal and does not restrict protocols to safe schemes before the operating system resolves them. Exploitation requires renderer-process compromise or equivalent script execution in that context, after which file: or custom URI schemes can open local files, invoke registered applications, or reach remote resources through handler associations.

CVSS severity8.3
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Streambert before 2.6.0 allows attackers to launch local handlers or open files via crafted URLs. The open-external IPC handler in src/ipc/downloads.js passes a renderer-supplied URL directly to Electron's shell.openExternal and does not restrict protocols to safe schemes before the operating system resolves them. Exploitation requires renderer-process compromise or equivalent script execution in that context, after which file: or custom URI schemes can open local files, invoke registered applications, or reach remote resources through handler associations.

The record

CVE
CVE-2026-52877
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
truelockmc
Product
Streambert
Classifications
CWE-20, CWE-749, T1202
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 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=< 2.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

truelockmc · Streambertversion=< 2.6.0

Published CVSS scores

8.3GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-749Exposed Dangerous Method or Function
T1202Indirect Command Execution

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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