CVE-2026-44839

XSS in Broadcom Rabbitmq Server 3.7.0 – 4.0.13

XSS

Published

27 May 2026

Modified

17 June 2026

Patch / advisory

View advisory

CVSS Score v4 5.6

Click a component to see what it means

Raw vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/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

EPSS Score 0.0018 8th percentile

Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-44839 is a medium-severity Basic XSS (CWE-80) vulnerability in Broadcom Rabbitmq Server. Its CVSS base score is 5.6 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 8th 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 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-32549

Vulnerability Data

RabbitMQ is a messaging and streaming broker. From 3.7.0 to before 4.1.2 and 4.0.13, This vulnerability is fixed in 4.1.2 and 4.0.13.

CWE(s): CWE-80

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 →

Why these techniques?

CWE-80 XSS in RabbitMQ web management UI directly enables exploitation of a public-facing application.

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

CVEs Like This One

CVE-2026-44838Same product: Broadcom Rabbitmq Server

CVE-2026-57215Same product: Broadcom Rabbitmq Server

CVE-2026-57216Same product: Broadcom Rabbitmq Server

CVE-2026-57212Same product: Broadcom Rabbitmq Server

CVE-2026-57219Same product: Broadcom Rabbitmq Server

CVE-2026-57220Same product: Broadcom Rabbitmq Server

CVE-2026-57214Same product: Broadcom Rabbitmq Server

CVE-2026-57221Same product: Broadcom Rabbitmq Server

CVE-2026-57218Same product: Broadcom Rabbitmq Server

CVE-2026-57217Same product: Broadcom Rabbitmq Server

Affected Assets

broadcom

rabbitmq server

3.7.0 — 4.0.13 · 4.1.0 — 4.1.2

Mitigating Controls

Control response

Prevent

Stop it (NIST 800-53)

SI-10 Information Input Validation
SI-15 Information Output Filtering
SI-2 Flaw Remediation

Detect

Catch it (NIST detect / respond)

—

Harden

Shrink the surface (DISA STIG)

—

Validate

Prove the fix (OWASP ASVS)

V1.2.1
V1.3.1
V1.3.3
V1.3.4

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

prevent

Directly requires validation and neutralization of untrusted input to block script injection that constitutes CWE-80 XSS.

SI-15 Information Output Filtering good match

prevent

Requires filtering or encoding of information sent to users, preventing reflected or stored script execution in the RabbitMQ web UI.

SI-2 Flaw Remediation partial match

prevent

Mandates prompt application of vendor patches that eliminate the XSS flaw present in versions before 4.0.13/4.1.2.

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 require output encoding and input validation that prevent basic XSS.

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

detects

Security testing in development catches unneutralized script tags before release.

A.8.25 Secure development life cycle partial match

prevents

Secure SDLC mandates input validation and output encoding that directly prevent basic XSS.

A.8.26 Application security requirements partial match

prevents

Application security requirements explicitly call for neutralization of script-related HTML tags.

A.8.28 Secure coding partial match

prevents

Secure coding standards require proper escaping of <, >, & to block XSS.