CVE-2023-20866

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 52% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In Spring Session version 3.0.0, the session id can be logged to the standard output stream. This vulnerability exposes sensitive information to those who have access to the application logs and can be used for session hijacking. Specifically, an application is vulnerable if it is using HeaderHttpSessionIdResolver.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

April 13, 2023

Last Modified

February 7, 2025

References (2)

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFixed inDependents
org.springframework.session:spring-session-core3.0.03.0.1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 113 total refreshes for this CVE.

  1. 2026-07-26 14:52 UTCEPSS rescore
  2. 2026-07-26 14:52 UTCEPSS rescore
  3. 2026-07-25 14:16 UTCEPSS rescore
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  5. 2026-07-24 14:15 UTCEPSS rescore
  6. 2026-07-23 14:16 UTCEPSS rescore
  7. 2026-07-23 14:16 UTCEPSS rescore
  8. 2026-07-23 02:18 UTCEG score recompute
  9. 2026-07-22 23:05 UTCEG score recompute
  10. 2026-07-22 14:06 UTCEPSS rescore
  11. 2026-07-21 15:23 UTCEPSS rescore
  12. 2026-07-20 17:05 UTCEPSS rescore
  13. 2026-07-19 14:29 UTCEPSS rescore
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  15. 2026-07-19 02:27 UTCEPSS rescore
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  17. 2026-07-18 10:03 UTCEPSS rescore
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  21. 2026-07-15 16:56 UTCEPSS rescore
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  24. 2026-07-13 22:28 UTCEPSS rescore
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  1. 2026-07-13 06:11 UTCEPSS rescore
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  6. 2026-07-09 19:08 UTCEPSS rescore
  7. 2026-07-08 15:13 UTCEPSS rescore
  8. 2026-07-07 13:44 UTCEPSS rescore
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  11. 2026-07-06 02:21 UTCEPSS rescore
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  15. 2026-07-02 16:58 UTCEPSS rescore
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  17. 2026-06-30 23:21 UTCEPSS rescore
  18. 2026-06-29 14:04 UTCEPSS rescore
  19. 2026-06-28 14:06 UTCEPSS rescore
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  21. 2026-06-28 04:54 UTCEPSS rescore
  22. 2026-06-28 04:54 UTCEPSS rescore
  23. 2026-06-27 03:07 UTCEPSS rescore
  24. 2026-06-25 13:48 UTCEPSS rescore
  25. 2026-06-25 13:48 UTCEPSS rescore
  26. 2026-06-24 14:03 UTCEPSS rescore
  27. 2026-06-24 14:03 UTCEPSS rescore
  28. 2026-06-23 21:31 UTCEPSS rescore
  29. 2026-06-23 21:31 UTCEPSS rescore
  30. 2026-06-22 14:24 UTCEPSS rescore
  31. 2026-06-22 14:24 UTCEPSS rescore
  32. 2026-06-21 14:55 UTCEPSS rescore
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  34. 2026-06-21 01:58 UTCEPSS rescore
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  36. 2026-06-19 19:24 UTCEPSS rescore
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  38. 2026-06-18 17:51 UTCEPSS rescore
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  40. 2026-06-17 17:51 UTCEPSS rescore
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  42. 2026-06-16 17:51 UTCEPSS rescore
  43. 2026-06-16 17:51 UTCEPSS rescore
  44. 2026-06-16 17:51 UTCEPSS rescore
  45. 2026-06-15 17:47 UTCEPSS rescore
  46. 2026-06-14 23:16 UTCEPSS rescore
  47. 2026-06-13 22:59 UTCEPSS rescore
  48. 2026-06-12 23:10 UTCEPSS rescore
  49. 2026-06-11 13:59 UTCEPSS rescore
  50. 2026-06-11 13:58 UTCEPSS rescore
  51. 2026-06-10 22:17 UTCEPSS rescore
  52. 2026-06-10 13:21 UTCEPSS rescore
  53. 2026-06-10 13:21 UTCEPSS rescore
  54. 2026-06-08 14:15 UTCEPSS rescore
  55. 2026-06-08 14:15 UTCEPSS rescore
  56. 2026-06-07 15:23 UTCEPSS rescore
  57. 2026-06-07 15:23 UTCEPSS rescore
  58. 2026-06-06 13:46 UTCEPSS rescore
  59. 2026-06-06 13:46 UTCEPSS rescore
  60. 2026-06-05 22:46 UTCEPSS rescore
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  63. 2026-06-05 06:09 UTCEPSS rescore
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  65. 2026-06-04 13:11 UTCEPSS rescore
  66. 2026-06-04 13:11 UTCEPSS rescore
  67. 2026-06-02 20:12 UTCEPSS rescore
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  69. 2026-06-02 20:12 UTCEPSS rescore
  70. 2026-06-01 13:51 UTCEPSS rescore
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  72. 2026-05-31 22:29 UTCEPSS rescore
  73. 2026-05-31 22:29 UTCEPSS rescore
  74. 2026-05-31 22:29 UTCEPSS rescore
  75. 2026-05-31 00:15 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2023-20866?
CVE-2023-20866 is a medium vulnerability published on April 13, 2023. In Spring Session version 3.0.0, the session id can be logged to the standard output stream. This vulnerability exposes sensitive information to those who have access to the application logs and can be used for session hijacking. Specifically, an application is vulnerable if it is using…
When was CVE-2023-20866 disclosed?
CVE-2023-20866 was first published in the National Vulnerability Database on April 13, 2023, with the most recent update on February 7, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-20866 actively exploited?
CVE-2023-20866 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 52.1% of all scored CVEs.
What is the CVSS score of CVE-2023-20866?
CVE-2023-20866 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2023-20866?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-20866, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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