CVE-2026-104733

User Impersonation/Authorization Bypass in XMPP Server ejabberd

7.4 HighFix available

User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: High

Exploit likelihood

0.21%Unchanged since Oct 3, 2026

What each source reports

CVE List Score used 7.4

User Impersonation/Authorization Bypass in XMPP Server ejabberd

User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.

Record: CVE-2026-104733
CVSS 4.0: 7.4 HighCVSS: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
Weakness: CWE-290
Updated: 2026-11-02

EUVDEUVD-2026-91582 7.4

User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.

Record: EUVD-2026-91582
CVSS 4.0: 7.4 HighCVSS: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
Updated: 2026-11-02

GitHub AdvisoriesGHSA-339c-8fr4-g2w4 7.4

User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate...

User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.

Record: GHSA-339c-8fr4-g2w4
CVSS 4.0: 7.4 HighCVSS: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/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
Weakness: CWE-290
Updated: 2026-11-02

NVD 7.4

User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.

Record: CVE-2026-104733
CVSS 4.0: 7.4 HighCVSS: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/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
Weakness: CWE-290
Updated: 2026-11-02

OSV 7.4

User Impersonation/Authorization Bypass in XMPP Server ejabberd

User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.

Record: CVE-2026-104733
CVSS 4.0: 7.4 HighCVSS: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
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-104733 7.4

User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.

Record: DEBIAN-CVE-2026-104733
CVSS 4.0: 7.4 HighCVSS: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/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
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-104733 7.4

User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.

Record: UBUNTU-CVE-2026-104733
CVSS 4.0: 7.4 HighCVSS: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
Updated: 2026-11-02

Affected products

processone ejabberd

Affected packages

Affected packages
Package	Affected	Fixed
`ejabberd` Debian:12	All versions, plus listed versions 23.01-123.10-123.10-1~bpo12+124.07-124.07-2 Show 7 moreShow less 24.12-124.12-224.12-324.12-3~bpo12+124.12-426.02-126.07-1	None known
`ejabberd` Debian:13	All versions, plus listed versions 24.12-324.12-3+deb13u124.12-3+deb13u224.12-426.02-126.07-1	None known
`ejabberd` Debian:14	before 26.07-1, plus listed versions 24.12-324.12-426.02-1	26.07-1
`ejabberd` Ubuntu:16.04:LTS	All versions, plus listed versions 15.03-215.10-316.01-116.01-2	None known
`ejabberd` Ubuntu:18.04:LTS	All versions, plus listed versions 17.07-117.08-317.11-118.01-118.01-2	None known
`ejabberd` Ubuntu:20.04:LTS	All versions, plus listed versions 19.08-219.09.1-120.01-1	None known
`ejabberd` Ubuntu:22.04:LTS	All versions, plus listed versions 21.01-221.07-121.12-1	None known
`ejabberd` Ubuntu:24.04:LTS	All versions, plus listed versions 23.01-123.10-1	None known
`ejabberd` Ubuntu:26.10	All versions, plus listed versions 24.12-426.02-1	None known
`ejabberd` Ubuntu:26.04:LTS	All versions, plus listed versions 24.12-324.12-4	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-104733 is a high vulnerability (CVSS 7.4) in Processone Ejabberd, published October 2, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.21%, the 12th percentile. Fixed in ejabberd 26.07-1.

Attack profile

How easy it is to exploit

What an attacker can affect

Exploit likelihood

What each source reports

Affected products

Affected packages

History

In short

References