Cyber Resilience

CVE-2026-42543

Published
04 June 2026
Modified
22 July 2026
CVSS Score v3.1 4.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
EPSS Score 0.0017 7th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-42543 is a medium-severity Trusting HTTP Permission Methods on the Server Side (CWE-650) vulnerability. Its CVSS base score is 4.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 7th 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-3 (Access Enforcement) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

IRIS is a web collaborative platform that helps incident responders share technical details during investigations. Versions prior to 2.4.28 are vulnerable to a cross-site request forgery attack, because they use the HTTP method `GET` to change state on the server.…

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Version 2.4.28 contains a patch.

CWE(s)
CWE-650

Related Threats

MITRE ATT&CK Enterprise Techniques

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 →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-28787Shared CWE-650
CVE-2026-15753Shared CWE-650
CVE-2025-21120Shared CWE-650
CVE-2024-45282Shared CWE-650
CVE-2024-45098Shared CWE-650
CVE-2024-56339Shared CWE-650
CVE-2026-44548Shared CWE-650
CVE-2024-45097Shared CWE-650
CVE-2023-50327Shared CWE-650

Affected Assets

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V3.5.1
  • V3.5.3
  • V4.1.4

Mitigating Controls (NIST 800-53 r5) AI

AC-3 Access Enforcement good match

AC-3 enforces authorizations for resource access without permitting unsafe assumptions about request methods to bypass checks.

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 flawed assumptions about HTTP method safety during design and coding.

ID.RA-01 partial match
prevents

Vulnerability identification processes can discover this server-side logic flaw through testing or scanning.

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.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect and prevent vulnerabilities where GET requests cause unintended state changes.

A.8.26 Application security requirements partial match
prevents

Application security requirements can mandate proper HTTP method usage and state-changing operation restrictions.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure system architecture principles include proper HTTP method handling and RESTful design to prevent state changes via GET.

A.8.28 Secure coding partial match
prevents

Secure coding practices directly address improper HTTP method usage and ensure state-changing operations use POST/PUT/DELETE.

References