CVE-2026-6636Public exploitNetwork attack vector

Authenticated file read via incomplete traversal filtering

Published Apr 20, 2026 · Updated Apr 20, 2026

Path traversal in PortalRunner Convert to it! allows remote authenticated users to read local files through crafted API paths. In buildCache.js, the Bun.serve handler derives a file path from URL.pathname and removes only literal '..' substrings before Bun.file resolves the result. The server listens on port 8080 during cache generation; successful access requires low-privileged authentication and affects confidentiality only.

CVSS severity4.3
Medium
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Path traversal in PortalRunner Convert to it! allows remote authenticated users to read local files through crafted API paths. In buildCache.js, the Bun.serve handler derives a file path from URL.pathname and removes only literal '..' substrings before Bun.file resolves the result. The server listens on port 8080 during cache generation; successful access requires low-privileged authentication and affects confidentiality only.

The record

CVE
CVE-2026-6636
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
PortalRunner
Product
Convert to it!
Classifications
CWE-22, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6998584ace3e11db66dff0b423612a5cf91de75b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

PortalRunner · Convert to it!version=6998584ace3e11db66dff0b423612a5cf91de75b

Published CVSS scores

4.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
4.0VulDBAV:N/AC:L/Au:S/C:P/I:N/A: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.

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

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo