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CVE-2023-20866

22
FAUCET Score

CVE-2023-20866 describes a sensitive information disclosure vulnerability in Spring Session version 3.0.0, specifically when using HeaderHttpSessionIdResolver, which can log session IDs to standard output. This medium-severity vulnerability (CVSS 6.5) allows attackers with access to application logs to potentially hijack user sessions due to the exposure of sensitive session identifiers. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.0.0CPE matchmatch criteria
cpe:2.3:a:vmware:spring_session:3.0.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.66%
Probability of exploitation in next 30 days
EPSS Percentile
47.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0066 is in the 58th percentile among its peer group of 21,974 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa
Product: org.springframework.session:spring-session-coreFixed in: 3.0.1

Vendor Advisories (2)

mavenGHSA-r7qr-f43m-pxfrmedium

Spring Session session ID can be logged to the standard output stream

Apr 13, 2023
redhatCVE-2023-20866Moderate

spring-session: Improper log of session id in standard output stream

Apr 13, 2023

References

spring.io / security/cve-2023-20866
Vendor Advisory