High severity · published Jun 9, 2026
CVE-2026-41838
Spring Framework Predictable Session ID in WebSocket Module
7.5
CVSS
0.2%
EPSS
No
On KEV
Description
IDs for WebSocket sessions in the spring-websocket module are not cryptographically unpredictable, which may be possible to exploit in combination with inadequate authorization rules.
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 6% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SF
Spring Framework · Spring
7.0.0 before 7.0.7.1; 6.2.0 before 6.2.18.1; 6.1.0 before 6.1.28; 5.3.0 before 5.3.49 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41838
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-41838
Vendor Advisory
https://spring.io/security/cve-2026-41838
More from Spring Framework
9.8
CVE-2026-59313
Server Sent Event stream corruption in Spring MVC functional web framework
9.8
CVE-2026-47892
Spring Framework Header Predicate Bypass in WebFlux Functional Endpoints
9.8
CVE-2026-47891
Spring Framework maxInMemorySize Bypassed in Jaxb2Decoder
9.8
CVE-2026-47890
Spring Framework Server Sent Event stream corruption while rendering fragments
9.8
CVE-2026-47884
Spring Framework Improper Path Limitation in XsltView