CVE-2026-59300Network attack vector

Sensitive payload exposure via unredacted AWS logging

Published Aug 27, 2026 · Updated Aug 27, 2026

Sensitive information exposure in the AWS adapter for Spring Cloud Function 5.0.0 through 5.0.3 allows remote authenticated users to reveal Lambda payload fields. In affected releases, received-payload logging can emit structured fields that JsonMasker does not redact through META-INF/mask.keys. The published assessment requires high privileges and user interaction; the concrete reported consequence is limited exposure of log-visible data.

CVSS severity3.1
Low
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive information exposure in the AWS adapter for Spring Cloud Function 5.0.0 through 5.0.3 allows remote authenticated users to reveal Lambda payload fields. In affected releases, received-payload logging can emit structured fields that JsonMasker does not redact through META-INF/mask.keys. The published assessment requires high privileges and user interaction; the concrete reported consequence is limited exposure of log-visible data.

The record

CVE
CVE-2026-59300
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Spring
Product
Spring Cloud Function
Classifications
Unavailable
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.2.16
  2. Affected versionversion=4.2.0 <=4.2.7
  3. Affected versionversion=4.3.0 <=4.3.4
  4. Affected versionversion=5.0.0 <=5.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Spring · Spring Cloud Functionversion=0 <=3.2.16; version=4.2.0 <=4.2.7; version=4.3.0 <=4.3.4; version=5.0.0 <=5.0.3

Published CVSS scores

3.1SpringCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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