CVE-2026-104733

User Impersonation/Authorization Bypass in XMPP Server ejabberd

Published Oct 2, 2026 CVSS 4.0 · 7.4 High EPSS < 1% KEV · Not listed
Description
User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.

Remediation

Vendor Solution

Update to the latest version of ejabberd (26.07)


Vendor Workaround

Disable the SALS-PLAIN authentication mechanism

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Process-one
Process-one ejabberd
Vendors & Products Process-one
Process-one ejabberd
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Weaknesses CWE-290
Type Values Removed Values Added
Weaknesses CWE-284
Type Values Removed Values Added
Description User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.
Title User Impersonation/Authorization Bypass in XMPP Server ejabberd
References
Metrics cvssV4_0

{'score': 7.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:H/SI:H/SA:H/E:P'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
NCSC.ch
Published
Updated
Oct 2, 2026, 4:57 PM
Reserved
Oct 2, 2026, 11:49 AM
Status
Deferred
Published
Oct 2, 2026, 1:17 PM
Modified
Oct 2, 2026, 5:59 PM