CVE-2026-87912

MEDIUMPre-NVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 83% 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, secondary
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: None knownExposed: 0

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

A missing S3 bucket ownership verification in the AWS Security Agent plugin in Amazon aws-agents-for-devsecops before 1.1.0 might allow remote attackers to obtain the private source archive of a scanned workspace, including credentials and infrastructure state contained in that archive, via a pre-registered storage bucket whose name is derived from a publicly known account identifier.

To remediate this issue, users should upgrade to version 1.1.0. Users should also verify that the scan output bucket in their account is owned by their own account, because upgrading does not release a bucket name that a third party has already registered.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 10, 2026

Advisory Details (3)

Auto-updated Sep 10, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Missing S3 bucket ownership verification in the AWS Security Agent skills for aws-agents-for-devsecops · Advisory · aws/agent-toolkit-for-aws · GitHub

https://github.com/aws/agent-toolkit-for-aws/security/advisories/GHSA-2px6-hhjp-3g5x
generic

CVE-2026-87912 and CVE-2026-87913: Missing S3 bucket ownership verification in the AWS Security Agent plugin for aws-agents-for-devsecops and MCP Server

https://aws.amazon.com/security/security-bulletins/2026-105-aws/
github_commit

commit 1c0dfd4f6772 (aws/agent-toolkit-for-aws)

Fix landed in aws/agent-toolkit-for-aws commit 1c0dfd4f6772 — awaiting tagged release

https://github.com/aws/agent-toolkit-for-aws/commit/1c0dfd4f677237ee9769769209969ca80b112140

Vendor Advisories for CVE-2026-87912(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 21× 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. 2026-09-18 21:19 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 20:15 UTCEG score recompute
  4. 2026-09-17 19:32 UTCEPSS rescore
  5. 2026-09-16 20:14 UTCEG score recompute
  6. 2026-09-16 14:09 UTCEPSS rescore
  7. 2026-09-16 05:15 UTCEPSS rescore
  8. 2026-09-15 20:12 UTCEG score recompute
  9. 2026-09-15 03:12 UTCEPSS rescore
  10. 2026-09-13 20:10 UTCEG score recompute
  11. 2026-09-13 16:48 UTCEPSS rescore
  12. 2026-09-12 20:09 UTCEG score recompute
  13. 2026-09-12 15:02 UTCEPSS rescore
  14. 2026-09-11 20:08 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 14:53 UTCEPSS rescore
  17. 2026-09-10 17:20 UTCEG score recompute
  18. 2026-09-10 16:50 UTCEG score recompute
  19. 2026-09-10 16:20 UTCEG score recompute
  20. 2026-09-10 15:45 UTCEG score recompute
  21. 2026-09-10 15:44 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-87912?
CVE-2026-87912 is a medium vulnerability published on September 10, 2026. A missing S3 bucket ownership verification in the AWS Security Agent plugin in Amazon aws-agents-for-devsecops before 1.1.0 might allow remote attackers to obtain the private source archive of a scanned workspace, including credentials and infrastructure state contained in that archive, via a…
When was CVE-2026-87912 disclosed?
CVE-2026-87912 was first published in the National Vulnerability Database on September 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-87912 actively exploited?
CVE-2026-87912 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 83.4% of all scored CVEs.
What is the CVSS score of CVE-2026-87912?
CVE-2026-87912 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-87912?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-87912, 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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