Missing S3 bucket ownership verification in the AWS Security Agent plugin for aws-agents-for-devsecops

published 2026-09-10 1 mo ago modified 2026-09-10 59 d ago also EUVD-2026-75569

cvss: 5.9; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits: 0; none known

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.

Patch / fix

links 1

github.com/aws/agent-toolkit-for-aws@1c0dfd4 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 1 mo ago (2026-09-10)

Exploit prediction

0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N
CNA	4.0	5.1	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
CNA	4.0	5.1	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

AWS AWS Security Agent plugin

Classification

Weakness

CWE-283 Unverified Ownership
CWE-341 Predictable from Observable State

References

github.com /aws/agent-toolkit-for-aws/commit/1c0dfd4f677237ee9769769209969ca80b112140
patch
aws.amazon.com /security/security-bulletins/2026-105-aws/
vendor-advisory
github.com /aws/agent-toolkit-for-aws/security/advisories/GHSA-2px6-hhjp-3g5x
third-party-advisory

Sources

CVE List CVE-2026-87912
NVD CVE-2026-87912

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary