Cyber Resilience

CVE-2026-39570

Info Disclosure

Info Disclosure
Published
08 April 2026
Modified
24 July 2026
CVSS Score v3.1 5.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS Score 0.0024 15th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-39570 is a medium-severity Insertion of Sensitive Information Into Sent Data (CWE-201) vulnerability. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 15th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-4 (Information Flow Enforcement) and SC-8 (Transmission Confidentiality and Integrity) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

Insertion of Sensitive Information Into Sent Data vulnerability in AA Web Servant 12 Step Meeting List 12-step-meeting-list allows Retrieve Embedded Sensitive Data.This issue affects 12 Step Meeting List: from n/a through <= 3.19.9.

CWE(s)
CWE-201

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1005 Data from Local System Collection
Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.
attack.mitre.org →
Why these techniques?

Vuln enables remote retrieval of embedded sensitive data from a public-facing web plugin, directly mapping to public app exploitation and local data collection.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-57347Shared CWE-201
CVE-2025-68014Shared CWE-201
CVE-2025-69132Shared CWE-201
CVE-2026-24565Shared CWE-201
CVE-2025-68006Shared CWE-201
CVE-2026-39480Shared CWE-201
CVE-2025-23774Shared CWE-201
CVE-2026-54834Shared CWE-201
CVE-2024-56300Shared CWE-201
CVE-2025-68515Shared CWE-201

Affected Assets

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • SC-8 Transmission Confidentiality and Integrity
  • AC-4 Information Flow Enforcement
  • SI-15 Information Output Filtering
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 1 hardening rule · 1 OS baseline
Validate
Prove the fix (OWASP ASVS)
  • V14.2.3

Mitigating Controls (NIST 800-53 r5) AI

SC-8 Transmission Confidentiality and Integrity good match
prevent

Directly requires cryptographic protection of transmitted data to prevent exposure of sensitive information in sent responses.

AC-4 Information Flow Enforcement good match
prevent

Enforces information flow policies that block unauthorized disclosure of sensitive data embedded in plugin outputs.

SI-15 Information Output Filtering partial match
prevent

Filters sensitive information from being included in data sent by the application, addressing the CWE-201 exposure vector.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly prevent insertion of sensitive data into application outputs and messages.

DE.CM-09 partial match
prevents

Monitoring runtime data flows and outputs can detect sensitive data being transmitted.

PR.DS-02 partial match
prevents

Protecting data-in-transit can include filtering or encrypting to avoid exposing sensitive content.

PR.DS-10 partial match
prevents

Protecting data-in-use includes removing confidential values before they are processed or sent.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.11 Data masking mostly match
prevents

Data-masking techniques can prevent sensitive values from appearing in transmitted payloads.

A.5.12 Classification of information partial match
mitigates

Classification identifies sensitive data so it is not inadvertently transmitted.

A.5.13 Labelling of information partial match
mitigates

Labelling makes sensitive data visible to developers and prevents accidental inclusion in outbound messages.

A.5.14 Information transfer partial match
mitigates

Information-transfer rules directly govern what data may be sent to external parties.

A.5.34 Privacy and protection of PII partial match
mitigates

PII-protection requirements reduce the chance of sending personal data to unauthorized recipients.

A.8.12 Data leakage prevention partial match
mitigates

DLP controls inspect and block outbound flows that contain sensitive information.

References