User Impersonation/Authorization Bypass in XMPP Server ejabberd
Priority LOW 32CWE-290Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-290.
Summary
User Impersonation in ProcessOnes XMMP Server ejabberd <= 26.04 allows an attacker to impersonate arbitrary users via unvalidated authzid parameter in SASL-PLAIN mechanism.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00215 12th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| ProcessOne | ejabberd | up to 26.04 | — | No fix listed | CNA |
- ejabberd VendorProcessOne Affected up to 26.04 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-104733
- 2026-10-03 Alias added: GHSA-339c-8fr4-g2w4
References
More ProcessOne vulnerabilities
- TI-2007-00879 Unspecified vulnerability in the mod_roster_odbc module in ejabberd before 1.1.3 has unknown impact and attack vectors. CVSS 2.0HIGH 10.0
- TI-2010-00292 ejabberd_c2s.erl in ejabberd before 2.1.3 allows remote attackers to cause a denial of… CVSS 2.0MEDIUM 5.0
- TI-2011-01532 expat_erl.c in ejabberd before 2.1.7 and 3.x before 3.0.0-alpha-3, and exmpp before… CVSS 2.0MEDIUM 5.0
- TI-2014-07188 ejabberd before 2.1.13 does not enforce the starttls_required setting when compression is… CVSS 2.0MEDIUM 5.0
- TI-2013-05190 The TLS driver in ejabberd before 2.1.12 supports (1) SSLv2 and (2) weak SSL ciphers… CVSS 2.0MEDIUM 4.3
- TI-2011-03787 The mod_pubsub module (mod_pubsub.erl) in ejabberd 2.1.8 and 3.0.0-alpha-3 allows remote… CVSS 2.0MEDIUM 4.0
Sources
- CVE-2026-104733 · CVE Program
- CVE-2026-104733 · NVD
- FIRST EPSS
- GHSA-339c-8fr4-g2w4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences