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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.

PUBLISHED Reserved 2026-03-19 | Published 2026-05-29 | Updated 2026-05-29 | Assigner CERT-PL




LOW: 2.3CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Product status

Default status
unknown

Any version
affected

Credits

Jakub Lipiński finder

References

cert.pl/posts/2026/05/CVE-2026-33384/ third-party-advisory

opensolution.org/home.html product

cve.org (CVE-2026-33386)

nvd.nist.gov (CVE-2026-33386)

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