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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ProcessOne | ejabberd | ≤ 26.04 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | ejabberd | 26.07-1 | — |
| Debian 13 | ejabberd | No fix yet | — |
| Debian 12 | ejabberd | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | ejabberd | No fix yet | — |
| Ubuntu 26.04 LTS | ejabberd | No fix yet | — |
| Ubuntu 24.04 LTS | ejabberd | No fix yet | — |
| Ubuntu 22.04 LTS | ejabberd | No fix yet | — |
| Ubuntu 20.04 LTS | ejabberd | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | ejabberd | No fix yet | — |
| Ubuntu 16.04 LTS | ejabberd | No fix yet | — |
References
- https://www.nsideattacklogic.de/advisories/NSIDE-SA-2026-004/ third-party-advisory
- https://github.com/processone/ejabberd/releases#release-26.07 release-notes