CVE-2026-44838
📛 CVE Title
RabbitMQ MQTT Topic Permission Authorization Bypass
Description
RabbitMQ is a messaging and streaming broker. From 4.2.0 to before 4.2.4, RabbitMQ's MQTT plugin allows for topic-level authorization using regular expressions with variable substitution. Administrators can create patterns such as ^{client_id}-sensors$ to restrict user access to topics that include their client ID. However, the client_id is provided by the user in the MQTT CONNECT packet and is inserted into the regex pattern without escaping special regex characters. This flaw enables an authenticated MQTT user to inject regex operators to bypass authorization. This vulnerability is fixed in 4.2.4 and 4.3.0.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- GitHub_M
- CVSS severity
- MEDIUM
- CVSS score
- 5.3 / 10
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:H/SI:H/SA:N- Effective score
- 5.3 / 10 MEDIUM source: CNA overview
- CWE(s)
-
CWE-863 - Reserved
- 2026-05-07
- Published
- 2026-05-27 15:03 UTC
- Last updated
- 2026-05-28 14:31 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/44xxx/CVE-2026-44838.json
- Linked Threat
- CVE-2026-44838 — CVE-2026-44838
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-27 15:16:28 UTC
- NVD last modified
- 2026-06-17 10:51:24 UTC
- NVD CVSS v3.1
- 8.1 / 10 HIGH source: nvd@nist.gov
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N- Exploitability subscore
- 2.8 / 10
- Impact subscore
- 5.2 / 10
- EPSS score
- 0.0025 (probability of exploitation in next 30 days)
- EPSS percentile
- 16.46% vs all CVEs — higher = more likely to be exploited, as of 2026-07-27
NVD / KEV / EPSS data refreshed 2026-07-27 23:53 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-32548 - Assigner
- GitHub_M
- Published
- May 27, 2026, 3:03:57 PM
- Updated
- May 28, 2026, 2:31:11 PM
- EUVD base score (CVSS 4.0)
-
5.3 / 10
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:H/SI:H/SA:N - EUVD-reported EPSS
- 0.2500
- Vendors
- rabbitmq
- Products
-
rabbitmq-server (4.2.0, < 4.2.4)
ENISA description: RabbitMQ is a messaging and streaming broker. From 4.2.0 to before 4.2.4, RabbitMQ's MQTT plugin allows for topic-level authorization using regular expressions with variable substitution. Administrators can create patterns such as ^{client_id}-sensors$ to restrict user access to topics that include their client ID. However, the client_id is provided by the user in the MQTT CONNECT packet and is inserted into the regex pattern without escaping special regex characters. This flaw enables an authenticated MQTT user to inject regex operators to bypass authorization. This vulnerability is fixed in 4.2.4 and 4.3.0.
Affected products (1)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| rabbitmq | rabbitmq-server |
>= 4.2.0, < 4.2.4 (affected)
|
— |
Affected products — CPE 2.3 (1) NVD
NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.
cpe:2.3:a:broadcom:rabbitmq_server:*:*:*:*:*:*:*:*
Vendor references (1)
References embedded in the original CVE record by the assigning CNA.
Web references (4)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-x866-xp2g-cx8v tenable:github.com
- https://nvd.nist.gov/vuln/detail/CVE-2026-44838 tenable:nvd.nist.gov
- https://www.cve.org/CVERecord?id=CVE-2026-44838 tenable:www.cve.org
- https://www.first.org/epss/ tenable:www.first.org
NVD-tagged references (1)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-x866-xp2g-cx8v security-advisories@github.com Vendor Advisory
Remediations (19)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:blog.qualys.com
RedSun is a zero-day LPE in Microsoft Defender with no patch available. Learn how to detect and mitigate it instantly using Qualys VMDR and TruRisk™ Eliminate.
2026-06-04 00:17 UTC -
web:dbsguru.com
Below is the list of Oracle Critical Patch IDs for all versions (26i, 21c, 19c) of Grid & Databases, along with combo PSU, EXADATA, and SUPERCLUSTER patch IDs for April 2026 . All patch IDs are enabled using the direct download link. An Essential/Critical Patch Update could be a collection of patches for multiple security vulnerabilities. These patches address vulnerabilities in Oracle code and ...
2026-06-04 00:17 UTC -
web:nvd.nist.gov
NVD Vulnerabilities CVE-2026-44838 Detail Undergoing Enrichment This CVE record is currently being enriched by team members, this process results in the association of reference link tags, CVSS, CWE, and CPE applicability statement data
2026-06-04 00:17 UTC -
web:patch.com
The best breaking news, stories, and events from the Patch network of local news sites
2026-06-04 00:17 UTC -
web:support.microsoft.com
Summary This article describes the security and cumulative update for 3.5, 4.8 and 4.8.1 for Windows 10 Version 22H2. Security Improvements CVE - 2026 -32178 - .NET Framework Remote Code Execution vulnerability This security update addresses a remote code execution vulnerability detailed in CVE - 2026 -32178. CVE - 2026 -32203 - .NET Framework Denial of Service vulnerability This security update ...
2026-06-04 00:17 UTC -
web:vulners.com
CVE-2026-44838 : RabbitMQ MQTT topic authorization bypass via unescaped client_id in regex patterns.
2026-06-04 00:17 UTC -
web:www.bleepingcomputer.com
CISA has ordered government agencies to secure their systems against a high-severity Oracle WebLogic Server vulnerability that was patched two years ago and is now actively exploited in attacks.
2026-06-04 00:17 UTC -
web:www.csoonline.com
Oracle has released the first security fixes in its new monthly Critical Security Patch Update (CSPU) cycle, designed to address urgent vulnerabilities that can't wait for the company's ...
2026-06-04 00:17 UTC -
web:www.cve.org
At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures
2026-06-04 00:17 UTC -
web:www.oracle.com
Oracle Critical Patch Update Advisory - April 2026 Description A Critical Patch Update is a collection of patches for multiple security vulnerabilities. These patches address vulnerabilities in Oracle code and in third party components included in Oracle products. These patches are usually cumulative, but each advisory describes only the security patches added since the previous Critical Patch ...
2026-06-04 00:17 UTC -
web:oradba.ch
On April 21, 2026 , Oracle released the Critical Patch Update (CPU) for April 2026 — 481 new security fixes across the entire Oracle product stack. For Oracle Database, this means another round of mandatory patching. What makes this quarter unusual: several key Release Updates, including 19.31 and 23.26.2, were not available on release day and are delayed by up to a week or more.
2026-06-19 02:28 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-06-19 02:28 UTC -
web:securityonline.info
A new report from the Sysdig Threat Research Team (TRT) reveals that on May 11, 2026 , a critical vulnerability in PraisonAI, an open-source multi-agent orchestration framework, was exploited in the wild just three hours and 44 minutes after its advisory was published. This rapid turnaround is a reminder of an emerging norm: "AI now enables attackers to reverse-engineer patches, identify the ...
2026-06-19 02:28 UTC -
web:support.sap.com
SAP security Patch Day Bulletin
2026-06-19 02:28 UTC -
web:www.cisa.gov
Fortinet Releases Guidance to Address Ongoing Exploitation of Authentication Bypass Vulnerability CVE - 2026 -24858
2026-06-19 02:28 UTC -
web:www.microsoft.com
Security Update Guide Notifications Microsoft's free Security Update Guide Notifications provide links to security-related software updates and notification of re-released security updates. These notifications are sent via email throughout the month as needed.
2026-06-19 02:28 UTC -
web:www.oracle.com
This Critical Security Patch Update contains 35 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Security Patch Update and other Oracle Software Security Assurance activities is located at May 2026 Critical Security Patch Update: Executive Summary and Analysis.
2026-06-19 02:28 UTC -
web:www.veeam.com
When a vulnerability is identified, our team promptly develops a patch to address and mitigate the risk. In line with our dedication to transparency, we publicly disclose the vulnerability and provide detailed mitigation information.
2026-06-19 02:28 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-06-19 02:28 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-44838.json.
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