TI-2026-25783 Aliases CVE-2026-33386 GHSA-wq6v-xp72-v7h5

XSS in QuickCMS

LOW 11CWE-79Published 2026-05-29 · Updated 2026-05-29

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: Present
Impact type: Cross-site scripting
Confidentiality · integrity · availability: None · None · None
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00185 8th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
OpenSolution	QuickCMS	up to 6.8	—	No fix listed	CNA

QuickCMS VendorOpenSolution Affected up to 6.8 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:opensolution:quick.cms::::::::	—	—	OpenSolution

cpe:2.3:a:opensolution:quick.cms:*:*:*:*:*:*:*:* Versions — — ·OpenSolution

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-33386
2026-10-03 Alias added: GHSA-wq6v-xp72-v7h5

References

Advisory 1

https://cert.pl/posts/2026/05/CVE-2026-33384/

Other 1

https://opensolution.org/home.html

TI-2024-38405 Quick.CMS 6.7 SQL Injection Authentication Bypass via Admin Login CVSS 4.0CRITICAL 9.3
TI-2023-23205 Cross-site scripting (XSS) vulnerability in opensolution Quick CMS v.6.7 allows a local… CVSS 3.1HIGH 8.6
TI-2023-23206 Cross-site scripting (XSS) vulnerability in opensolution Quick CMS v.6.7 allows a local… CVSS 3.1MEDIUM 5.4
TI-2023-23204 Cross-site scripting (XSS) vulnerability in opensolution Quick CMS v.6.7 allows a local… CVSS 3.1MEDIUM 5.4
TI-2023-23203 Cross-site scripting (XSS) vulnerability in opensolution Quick CMS v.6.7 allows a local… CVSS 3.1MEDIUM 5.4
TI-2023-23202 Cross-site scripting (XSS) vulnerability in opensolution Quick CMS v.6.7 allows a local… CVSS 3.1MEDIUM 5.4

See all 46 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences