CVE-2026-18703

MEDIUMPre-NVD 4.24.2—
EchelonGraph scoreHIGH confidence

Score 4.2 from GitHub Security Advisory (severity: LOW) published 2026-08-11. a secondary CVSS source baseline 4.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.2Exploit: None knownExposed: 0

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

An issue in MongoDB Server could allow a party with a valid client certificate and a corresponding user account to authenticate using a certificate-based authentication method, even when an administrator has configured the server to restrict authentication to other mechanisms. This could allow authentication through a method the administrator intended to disable.

CVSS v3
4.2
EG Score
4.2(high)
EG Risk
19(Track)
EG Risk 19/100SSVC: 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
Severity42% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

August 11, 2026

Last Modified

August 11, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
No patch confirmed yet.
generic

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https://jira.mongodb.org/browse/SERVER-127863

Vendor Advisories for CVE-2026-18703(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 29× 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.

  1. 2026-08-20 18:11 UTCGHSA enrichment
  2. 2026-08-19 18:40 UTCEG score recompute
  3. 2026-08-19 18:40 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-18 18:47 UTCEG score recompute
  6. 2026-08-18 18:47 UTCGHSA enrichment
  7. 2026-08-18 13:48 UTCEPSS rescore
  8. 2026-08-17 19:16 UTCEG score recompute
  9. 2026-08-17 19:16 UTCGHSA enrichment
  10. 2026-08-17 13:47 UTCEPSS rescore
  11. 2026-08-16 18:59 UTCEG score recompute
  12. 2026-08-16 18:59 UTCGHSA enrichment
  13. 2026-08-16 14:56 UTCEPSS rescore
  14. 2026-08-16 02:14 UTCEPSS rescore
  15. 2026-08-15 19:26 UTCEG score recompute
  16. 2026-08-15 19:26 UTCGHSA enrichment
  17. 2026-08-15 01:30 UTCEPSS rescore
  18. 2026-08-14 19:55 UTCEG score recompute
  19. 2026-08-14 19:55 UTCGHSA enrichment
  20. 2026-08-13 22:00 UTCEPSS rescore
  21. 2026-08-13 20:24 UTCGHSA enrichment
  22. 2026-08-12 20:49 UTCEG score recompute
  23. 2026-08-12 20:49 UTCGHSA enrichment
  24. 2026-08-12 13:50 UTCEPSS rescore
  25. 2026-08-11 21:18 UTCEG score recompute
Show 4 more
  1. 2026-08-11 20:45 UTCEG score recompute
  2. 2026-08-11 19:18 UTCEG score recompute
  3. 2026-08-11 18:40 UTCEG score recompute
  4. 2026-08-11 18:40 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18703?
CVE-2026-18703 is a medium vulnerability published on August 11, 2026. An issue in MongoDB Server could allow a party with a valid client certificate and a corresponding user account to authenticate using a certificate-based authentication method, even when an administrator has configured the server to restrict authentication to other mechanisms. This could allow…
When was CVE-2026-18703 disclosed?
CVE-2026-18703 was first published in the National Vulnerability Database on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18703 actively exploited?
CVE-2026-18703 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 98.2% of all scored CVEs.
What is the CVSS score of CVE-2026-18703?
CVE-2026-18703 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2026-18703?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18703, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-18703

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