PT-2026-44894 · Opensolution · Quick.Cms

Jakub Lipiński · Published 2026-05-29 · Updated 2026-05-29 · CVE-2026-33386

NVD

CVSS v4.0

2.3

Low

Base vector

AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-33386

Affected Products

Quick.Cms

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-33386 · Security Note
• https://cert.pl/posts/2026/05/CVE-2026-33384 · Note
• https://twitter.com/f1tym1/status/2060393028305523016 · Twitter Post
• https://opensolution.org/home.html · Note