CVE-2026-18954

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreHIGH confidence

Score 5.5 from GitHub Security Advisory published 2026-08-05. a secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

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

Incorrect authorization in the aggregation pipeline tool in Amazon AWS Labs DocumentDB MCP Server before 1.0.12 might allow an authenticated MCP client to perform inappropriate write operations on the connected database via write-capable aggregation pipeline stages that bypass the read-only mode enforcement logic.

To remediate this issue, users should upgrade to version 1.0.12 or later.

CVSS v3
5.5
EG Score
5.5(high)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 10, 2026

Advisory Details (2)

Auto-updated Aug 5, 2026
Patch available. Sources: github_release.
generic

CVE-2026-18954 - Incorrect authorization in the aggregation pipeline tool in Amazon AWS Labs DocumentDB MCP Server

https://aws.amazon.com/security/security-bulletins/2026-076-aws/
github_release Patch Available

2026.04.20260408085348

Patch available: awslabs/mcp 2026.04.20260408085348

https://github.com/awslabs/mcp/releases/tag/2026.04.20260408085348

Vendor Advisories for CVE-2026-18954(2)

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 / 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.

  1. 2026-08-19 21:42 UTCEG score recompute
  2. 2026-08-19 21:42 UTCGHSA enrichment
  3. 2026-08-19 17:03 UTCEPSS rescore
  4. 2026-08-18 23:29 UTCGHSA enrichment
  5. 2026-08-18 01:22 UTCEG score recompute
  6. 2026-08-18 01:22 UTCGHSA enrichment
  7. 2026-08-17 13:47 UTCEPSS rescore
  8. 2026-08-17 03:10 UTCEG score recompute
  9. 2026-08-17 03:10 UTCGHSA enrichment
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 05:02 UTCEG score recompute
  12. 2026-08-16 05:02 UTCGHSA enrichment
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 06:54 UTCEG score recompute
  15. 2026-08-15 06:54 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 08:00 UTCEG score recompute
  18. 2026-08-14 08:00 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 09:52 UTCEG score recompute
  21. 2026-08-13 09:52 UTCGHSA enrichment
  22. 2026-08-12 13:50 UTCEPSS rescore
  23. 2026-08-12 11:45 UTCEG score recompute
  24. 2026-08-12 11:45 UTCGHSA enrichment
  25. 2026-08-11 13:42 UTCEPSS rescore
Show 22 more
  1. 2026-08-11 13:37 UTCEG score recompute
  2. 2026-08-11 13:37 UTCGHSA enrichment
  3. 2026-08-11 00:00 UTCEPSS rescore
  4. 2026-08-10 15:29 UTCGHSA enrichment
  5. 2026-08-10 08:38 UTCEG score recompute
  6. 2026-08-10 08:38 UTCGHSA enrichment
  7. 2026-08-09 13:46 UTCEPSS rescore
  8. 2026-08-09 10:30 UTCEG score recompute
  9. 2026-08-09 10:30 UTCGHSA enrichment
  10. 2026-08-08 16:37 UTCEPSS rescore
  11. 2026-08-08 12:22 UTCEG score recompute
  12. 2026-08-08 12:22 UTCGHSA enrichment
  13. 2026-08-07 14:13 UTCGHSA enrichment
  14. 2026-08-06 16:05 UTCGHSA enrichment
  15. 2026-08-06 14:17 UTCEG score recompute
  16. 2026-08-06 14:17 UTCGHSA enrichment
  17. 2026-08-06 13:53 UTCEG score recompute
  18. 2026-08-06 13:53 UTCGHSA enrichment
  19. 2026-08-06 13:46 UTCEPSS rescore
  20. 2026-08-05 20:32 UTCEG score recompute
  21. 2026-08-05 20:15 UTCEG score recompute
  22. 2026-08-05 20:15 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18954?
CVE-2026-18954 is a medium vulnerability published on August 5, 2026. Incorrect authorization in the aggregation pipeline tool in Amazon AWS Labs DocumentDB MCP Server before 1.0.12 might allow an authenticated MCP client to perform inappropriate write operations on the connected database via write-capable aggregation pipeline stages that bypass the read-only mode…
When was CVE-2026-18954 disclosed?
CVE-2026-18954 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18954 actively exploited?
CVE-2026-18954 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 98.6% of all scored CVEs.
What is the CVSS score of CVE-2026-18954?
CVE-2026-18954 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-18954?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18954, 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

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