6.8

CVE-2026-67421: broadcom rabbitmq_server Missing Authorization

CVSS: 6.8v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-67421DEBIAN-CVE-2026-67421
Published 25-09-2026Last modified 25-09-2026
Open JSON

Vulnerability summary

CVE-2026-67421 is a medium (CVSS 6.8) Missing Authorization vulnerability in broadcom rabbitmq_server. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 19.2% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
37/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.8/10
010
Medium · v3.1 (NVD)
EPSS score
0.28%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2026:67552

Timeline

  1. 25-09-2026
    PublishedVulnerability first disclosed.
  2. 25-09-2026
    Last modifiedVulnerability information updated.

Description

RabbitMQ is a messaging and streaming broker. From 3.13.0 until 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5, RabbitMQ Management rendered an AMQP authorization-error reason containing an attacker-controlled queue name as HTML when the OAuth management UI was enabled. Exploitation requires an attacker with queue configure permission, a management administrator who can see but cannot read that queue, and the administrator clicking Get Message(s). A queue name containing a base element can then retarget the automatic relative refresh because the Content Security Policy omits base-uri and connect-src, and an attacker endpoint that permits the management origin through CORS can receive the victim's Authorization header. This issue is fixed in versions 3.13.19, 4.0.24, 4.1.15, 4.2.10, and 4.3.5.

CVSS metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

26-09-202619-10-2026
EPSS score
0.28%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • githubUnverified

    Rabbitmq Server

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Broadcom1 product
  • rabbitmq_server≥ 3.13.0, < 3.13.9 | ≥ 4.0.0, < 4.0.24 | ≥ 4.1.0, < 4.1.15 | ≥ 4.2.0, < 4.2.10 | ≥ 4.3.0, < 4.3.5
Debian1 product
  • rabbitmq-serverAll versions (No fix recorded) | < 4.3.6-1
Rabbitmq1 product
  • rabbitmq-server≥ 3.13.0, < 3.13.19 | ≥ 4.0.0, < 4.0.24 | ≥ 4.1.0, < 4.1.15 | ≥ 4.2.0, < 4.2.10 | ≥ 4.3.0, < 4.3.5
Ubuntu1 product
  • rabbitmq-serverAll versions (No fix recorded)

4 vendors · 4 products

References

6 links