CVE-2026-104733 - Vulnerability Details - OpenCVE

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 Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact High

Subsequent System Availability Impact High

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Vendors	Products
Process-one	Ejabberd

No data.

No data.

References

Link	Providers
https://github.com/processone/ejabberd/releases#release-26.07
https://www.nsideattacklogic.de/advisories/NSIDE-SA-2026-004/

History

Sun, 04 Oct 2026 20:45:00 +0000

Type	Values Removed	Values Added
First Time appeared		Process-one Process-one ejabberd
Vendors & Products		Process-one Process-one ejabberd

Fri, 02 Oct 2026 19:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Fri, 02 Oct 2026 17:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-290

Fri, 02 Oct 2026 13:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-284

Fri, 02 Oct 2026 12:45:00 +0000

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		https://github.com/processone/ejabberd/releases#release-26.07 https://www.nsideattacklogic.de/advisories/NSIDE-SA-2026-004/
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'}`

MITRE

Status: PUBLISHED

Assigner: NCSC.ch

Published: 2026-10-02T12:19:10.635Z

Updated: 2026-10-02T16:57:18.308Z

Reserved: 2026-10-02T11:49:34.103Z

Link: CVE-2026-104733

Vulnrichment

Updated: 2026-10-02T16:57:12.439Z

NVD

Status : Deferred

Published: 2026-10-02T13:17:45.010

Modified: 2026-10-02T17:59:09.430

Link: CVE-2026-104733

Redhat

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-104733", "assignerOrgId": "455daabc-a392-441d-aa46-37d35189897c", "state": "PUBLISHED", "assignerShortName": "NCSC.ch", "dateReserved": "2026-10-02T11:49:34.103Z", "datePublished": "2026-10-02T12:19:10.635Z", "dateUpdated": "2026-10-02T16:57:18.308Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "455daabc-a392-441d-aa46-37d35189897c", "shortName": "NCSC.ch", "dateUpdated": "2026-10-02T12:19:10.635Z"}, "title": "User Impersonation/Authorization Bypass in XMPP Server ejabberd", "datePublic": "2026-07-31T09:01:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "description": "User Impersonation"}]}], "impacts": [{"descriptions": [{"lang": "en", "value": "Authorization Bypass"}]}], "affected": [{"vendor": "ProcessOne", "product": "ejabberd", "platforms": ["MacOS", "Linux"], "repo": "https://github.com/processone/ejabberd", "versions": [{"status": "affected", "version": "0", "lessThanOrEqual": "26.04", "changes": [{"at": "26.07", "status": "unaffected"}], "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism."}]}], "references": [{"url": "https://www.nsideattacklogic.de/advisories/NSIDE-SA-2026-004/", "tags": ["third-party-advisory"]}, {"url": "https://github.com/processone/ejabberd/releases#release-26.07", "tags": ["release-notes"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "PROOF_OF_CONCEPT", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 7.4, "vectorString": "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"}}], "workarounds": [{"lang": "en", "value": "Disable the SALS-PLAIN authentication mechanism", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Disable the SALS-PLAIN authentication mechanism"}]}], "solutions": [{"lang": "en", "value": "Update to the latest version of ejabberd (26.07)", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Update to the latest version of ejabberd (26.07)"}]}], "credits": [{"lang": "en", "value": "Marius Schwarz (NSIDE ATTACK LOGIC GmbH)", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-290", "lang": "en", "description": "CWE-290 Authentication Bypass by Spoofing"}]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-02T16:56:58.717189Z", "id": "CVE-2026-104733", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-02T16:57:18.308Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-104733", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-02T16:56:58.717189Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-290", "description": "CWE-290 Authentication Bypass by Spoofing"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-02T16:57:12.439Z"}}], "cna": {"title": "User Impersonation/Authorization Bypass in XMPP Server ejabberd", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "Marius Schwarz (NSIDE ATTACK LOGIC GmbH)"}], "impacts": [{"descriptions": [{"lang": "en", "value": "Authorization Bypass"}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.4, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "PROOF_OF_CONCEPT", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"repo": "https://github.com/processone/ejabberd", "vendor": "ProcessOne", "product": "ejabberd", "versions": [{"status": "affected", "changes": [{"at": "26.07", "status": "unaffected"}], "version": "0", "versionType": "custom", "lessThanOrEqual": "26.04"}], "platforms": ["MacOS", "Linux"], "defaultStatus": "unaffected"}], "solutions": [{"lang": "en", "value": "Update to the latest version of ejabberd (26.07)", "supportingMedia": [{"type": "text/html", "value": "Update to the latest version of ejabberd (26.07)", "base64": false}]}], "datePublic": "2026-07-31T09:01:00.000Z", "references": [{"url": "https://www.nsideattacklogic.de/advisories/NSIDE-SA-2026-004/", "tags": ["third-party-advisory"]}, {"url": "https://github.com/processone/ejabberd/releases#release-26.07", "tags": ["release-notes"]}], "workarounds": [{"lang": "en", "value": "Disable the SALS-PLAIN authentication mechanism", "supportingMedia": [{"type": "text/html", "value": "Disable the SALS-PLAIN authentication mechanism", "base64": false}]}], "x_generator": {"engine": "Vulnogram 1.0.2"}, "descriptions": [{"lang": "en", "value": "User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.", "supportingMedia": [{"type": "text/html", "value": "User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "User Impersonation"}]}], "providerMetadata": {"orgId": "455daabc-a392-441d-aa46-37d35189897c", "shortName": "NCSC.ch", "dateUpdated": "2026-10-02T12:19:10.635Z"}}}, "cveMetadata": {"cveId": "CVE-2026-104733", "state": "PUBLISHED", "dateUpdated": "2026-10-02T16:57:18.308Z", "dateReserved": "2026-10-02T11:49:34.103Z", "assignerOrgId": "455daabc-a392-441d-aa46-37d35189897c", "datePublished": "2026-10-02T12:19:10.635Z", "assignerShortName": "NCSC.ch"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["MacOS", "Linux"], "product": "ejabberd", "repo": "https://github.com/processone/ejabberd", "vendor": "ProcessOne", "versions": [{"changes": [{"at": "26.07", "status": "unaffected"}], "lessThanOrEqual": "26.04", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "vulnerability@ncsc.ch"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism."}], "id": "CVE-2026-104733", "lastModified": "2026-10-02T17:59:09.430", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "vulnerability@ncsc.ch", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-104733", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-02T16:56:58.717189Z", "version": "2.0.3"}}]}, "published": "2026-10-02T13:17:45.010", "references": [{"source": "vulnerability@ncsc.ch", "url": "https://github.com/processone/ejabberd/releases#release-26.07"}, {"source": "vulnerability@ncsc.ch", "url": "https://www.nsideattacklogic.de/advisories/NSIDE-SA-2026-004/"}], "sourceIdentifier": "vulnerability@ncsc.ch", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}