CVE-2026-3317

MediumUpdated

Published: 21 April 2026

Published

21 April 2026

Modified

19 May 2026

KEV Added

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Patch

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CVSS Score v4 5.1 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/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

EPSS Score 0.0030 53.3th percentile

Risk Priority 10 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-3317 is a medium-severity Cross-site Scripting (CWE-79) vulnerability in Incibe (inferred from references). Its CVSS base score is 5.1 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 46.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-24073
🇪🇸 INCIBE: www.incibe.es

Vulnerability details

Reflected Cross-Site Scripting (XSS) vulnerability in Navigate Content Management System. The vulnerability is present in the '/blog' endpoint because user input is not properly sanitized through designed query parameters. This results in unsafe HTML rendering, which could allow a remote…

attacker to execute JavaScript code in the victim's browser.

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

Reflected XSS in a public web endpoint directly enables exploitation of a public-facing application via unsanitized input leading to arbitrary JS execution.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1