Skip to content
VulniPulse
Sign in
Medium 2 vendors · 2 advisories

CVE-2026-108946: Apache ActiveMQ, ActiveMQ Broker: The broker does not verify user provided connection id matches connection

CVE-2026-108946 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
Medium
CVSS base score
6.3 (Red Hat)
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N · base score 6.5, scored by CISA-ADPAttack vector: network. Attack complexity: low. Privileges required: low. User interaction: none. Scope: unchanged. Confidentiality impact: none. Integrity impact: high. Availability impact: none.
Weakness
  • CWE-20 Improper input validation
CISA SSVC
Exploitation: none observed. Automatable: no. Technical impact: partial. CISA, .
Fixed releases
  • Apache: 6.3.3, 6.4.0, 5.19.12
  • Red Hat: 6.4.0, 6.3.3, 5.19.12
Vendor advisories
2 from Apache, Red Hat
Assigned by
apache (CNA)
CVE record published
Listed by VulniPulse
Record changed

Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-108946; each belongs to its advisory, not to every product listed. How records are collected and checked.

Description

Improper input validation vulnerability in Apache ActiveMQ, Apache ActiveMQ KahaDB. The ActiveMQ broker resolves connection, session and consumer state from ids that are user provided and in some scenarios does not validate that they ids are bound to that user. This allows an authenticated client to spoof another user's ids. This allows: * an authenticated client consumes from another connection's temporary queue/topic by putting the victim's connection id in its own ConsumerId, bypassing the broker-side ownership check. * a duplicate ConsumerId registration is only logged, after which the attacker's RemoveInfo or disconnect tears down the victim's live subscription * a forged MessageAck for the victim's ConsumerId permanently deletes an in-flight, unacknowledged message. This issue affects Apache ActiveMQ: from 6.0.0 before 6.3.3, before 5.19.12; Apache ActiveMQ KahaDB: from 6.0.0 before 6.3.3, before 5.19.12. Users are recommended to upgrade to version 6.4.0, 6.3.3, or 5.19.12, which fixes the issue.

Text from the CVE.org record (apache).

How do I fix CVE-2026-108946?

Upgrade to a fixed release named by the vendor:

  • Apache: 6.3.3, 6.4.0, 5.19.12
  • Red Hat: 6.4.0, 6.3.3, 5.19.12
  • Users are recommended to upgrade to version 6.4.0, 6.3.3, or 5.19.12, which fixes the issue. (Apache)

Vendor advisories for CVE-2026-108946

Apache

1 advisory
  • Advisory severityUnrated

    Advisory [CVE-2026-108946] Improper input validation vulnerability in Apache ActiveMQ, Apache ActiveMQ KahaDB

    CVE-2026-108946Source published Source updated

    Improper input validation vulnerability in Apache ActiveMQ, Apache ActiveMQ KahaDB. The ActiveMQ broker resolves connection, session and consumer state from ids that are user provided and in some scenarios does not validate that they ids are bound to that user. This allows an authenticated client to spoof another user's ids. - an authenticated client consumes from another connection's temporary queue/topic by putting the victim's connection id in its own ConsumerId, bypassing the broker-side ownership check. - a duplicate ConsumerId registration is only logged, after which the attacker's RemoveInfo or disconnect tears down the victim's live subscription - a forged MessageAck for the victim's ConsumerId permanently deletes an in-flight, unacknowledged message. This issue affects Apache…

    Affected products in this advisory
    • Apache ActiveMQ
    Source-reported affected versions
    • 6.0.0 before 6.3.3
    Source-reported fixed versions
    • 6.3.3
    • 6.4.0
    • 5.19.12
    Mitigation guidance
    • Users are recommended to upgrade to version 6.4.0, 6.3.3, or 5.19.12, which fixes the issue.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory

References

Timeline

  1. CVE record published
  2. First vendor advisory listed by VulniPulse
  3. CVE record last updated

More Apache advisories

All Apache advisories

Get an email when Apache publishes the next one.

See Apache's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).

Alert me about Apache

iPhone and Android apps · New on the App Store

Get alerts for new CVEs on your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery
Download on the App StoreGet CVE alerts on AndroidSee app features