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CVE-2026-33386

XSS in QuickCMS

LOW
2.3
CVSS Score
Published: May 29, 2026 at 03:12 PM UTC
Updated: July 21, 2026 at 03:29 PM UTC
1 product affected across 1 vendorQuick.CMS

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Severity
LOW2.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Third Party Advisory
Source: [email protected]
https://cert.pl/posts/2026/05/CVE-2026-33384/
Product
Source: [email protected]
https://opensolution.org/home.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

2.3LOWCERT-PL
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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