Vulnerability Report

CVE-2026-41839

Title: Spring WebFlux Session Escalation via Compromised Subdomain

XSS

Proof Of Concept

No public PoC currently indexed for CVE-2026-41839.

CWE Category CWE-384
Published Date Jun 09, 2026
Modified Date Jul 23, 2026
Exploit Status Not Found
Score 4.2 CVSS v3.1
Exploit Probability (EPSS)
0.20%

Vulnerability Summary

CVE-2026-41839: A WebFlux application with a compromised subdomain (for example, compromised via cross-site scripting (XSS)) is vulnerable to an escalation attack exchanging a known session ID for that of an authenticated user. Affected versions: Spring Framework 7.0.0 through 7.0.7; 6.2.0 through 6.2.18; 6.1.0 through 6.1.27; 5.3.0 through 5.3.48.

Impacted Vendors

S
springsource 1
V
vmware 1

Reference Links

https://spring.io/security/cve-2026-41839
CVSS v3.1
Source Entity [email protected]
Severity MEDIUM
4.2
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
REQUIRED
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-41839 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction REQUIRED
CVSS Vector String CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected Stack

No specific products linked.