CVE-2026-63303
MEDIUMDescription
A Path Traversal vulnerability exists in Quick.CMS through the URI path component of HTTP requests, where the server fails to normalize dot-dot-slash (../) sequences before resolving and serving the requested file. An authenticated attacker with admin privileges can use this vulnerability to read contents of files located in the sibling directory of the webroot via a crafted HTTP request containing ../ sequences in the URI. The vendor assessed the likelihood of exploitation as very low and determined that a fix is not necessary.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
TridentStack Control tracks known vulnerabilities across your Windows, macOS, and Linux fleet and shows the fix as soon as one is published. See how it works
CVSS v4 Vector
Exploitability
Impact
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/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
Exploit Intelligence
Low risk: more likely to be exploited than 32% of all known CVEs.
References
Related Vulnerabilities
Other CWE-23 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-27199 | High | 7.3 | 100% | KEV + Ransom | Fix |
| CVE-2020-5410 | High | 7.5 | 96% | KEV | Fix |
| CVE-2021-40870 | Critical | 9.8 | 93% | KEV | Fix |
| CVE-2025-64446 | Critical | 9.8 | 92% | KEV | Fix |
| CVE-2020-5405 | Medium | 6.5 | 69% | - | Fix |
| CVE-2025-55752 | High | 7.5 | 67% | - | Fix |
Common questions
How do I fix CVE-2026-63303?
No published fix for CVE-2026-63303 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-63303 being actively exploited?
Not that we know of. CVE-2026-63303 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.39% is the estimated probability that it will be exploited in the next 30 days. That is higher than 32% of all scored CVEs.
How severe is CVE-2026-63303?
CVE-2026-63303 has a CVSS v4 base score of 5.1, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
Embed a live status badge for CVE-2026-63303
Markdown
[](https://tridentstack.com/cve/CVE-2026-63303)HTML
<a href="https://tridentstack.com/cve/CVE-2026-63303"><img src="https://tridentstack.com/cve/badge/CVE-2026-63303.svg" alt="CVE-2026-63303"></a>Find and fix vulnerabilities across your fleet
TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-30.