CVE-2026-57320

High

Published: 29 June 2026

Published

29 June 2026

Modified

29 June 2026

KEV Added

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Patch

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CVSS Score v3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

EPSS Score N/A

Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-57320 is a high-severity Cross-site Scripting (CWE-79) vulnerability. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-40096

Vulnerability details

Unauthenticated Cross Site Scripting (XSS) in BEAR <= 1.1.8 versions.

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 →

T1059.007 JavaScript Execution

Adversaries may abuse various implementations of JavaScript for execution.

attack.mitre.org →

T1185 Browser Session Hijacking Collection

Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.

attack.mitre.org →

Why these techniques?

Unauthenticated XSS (CWE-79) directly enables script injection into a public-facing web app (T1190), arbitrary JavaScript execution in victim browsers (T1059.007), and session hijacking via stolen cookies or DOM manipulation (T1185).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0