XSS in QuickCMS_CVE-2026-33386

2.3 / 10

LOW

CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Description

QuickCMS is vulnerable to Cross-Site Scripting (XSS) through its insecure HTTP-based plugin‑fetching mechanism. A malicious attacker can perform a Man‑in‑the‑Middle (MITM) attack by impersonating the opensolution.org server and serving arbitrary HTML or JavaScript at the plugin list endpoint. When a user accesses the plugin page, the malicious content is automatically fetched, rendered, and executed.

This issue was fixed in a patch to version 6.8 published on 15.05.2026, deployments without this patch are still vulnerable.

Basic Information

ID CVE-2026-33386

Source CERT-PL

Published May 29, 2026 at 15:12

Affected Product

Vendor OpenSolution

Product QuickCMS

Affected Versions OpenSolution QuickCMS 0

CWE Classification

CWE-79

References

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    "published": "2026-05-29T15:12:20.613Z",
    "modified": "2026-05-29T15:12:20.613Z",
    "type": "cve",
    "title": "XSS in QuickCMS",
    "source": "CERT-PL",
    "references": "https://cert.pl/posts/2026/05/CVE-2026-33384/\nhttps://opensolution.org/home.html",
    "id": "CVE-2026-33386",
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