CVE-2026-63303Network attack vector

Authenticated file disclosure via unnormalized URI paths

Published Jul 28, 2026 · Updated Jul 28, 2026

Path traversal in OpenSolution Quick.Cms 6.8.0 and earlier allows remote authenticated users with admin privileges to read files via HTTP. The URI path handler resolves and serves attacker-supplied paths without normalizing ../ sequences, allowing requests to escape the webroot into a sibling directory. Administrative authentication is required, and the documented impact is limited to disclosure of file contents reachable in that sibling directory.

CVSS severity5.1
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in OpenSolution Quick.Cms 6.8.0 and earlier allows remote authenticated users with admin privileges to read files via HTTP. The URI path handler resolves and serves attacker-supplied paths without normalizing ../ sequences, allowing requests to escape the webroot into a sibling directory. Administrative authentication is required, and the documented impact is limited to disclosure of file contents reachable in that sibling directory.

The record

CVE
CVE-2026-63303
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
OpenSolution
Product
Quick.Cms
Classifications
CWE-23, T1005
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=0 <=6.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

OpenSolution · Quick.Cmsversion=0 <=6.8.0

Published CVSS scores

5.1CERT-PLCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-23Relative Path Traversal
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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