CVE-2019-15557: XM^online 2 User Account and Authentication server 1.0.0 allows SQL injection via a tenant key.

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2019-15557 is a critical-severity flaw (CVSS 9.8) affecting xm\^online 2 user account and authentication server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

XM^online 2 User Account and Authentication server 1.0.0 allows SQL injection via a tenant key.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-89
Published	2019-08-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: xm-online

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-08-26 17:15 UTCPublished CVE record published
2026-06-17 02:20 UTCUpdated Record last modified

xm-online xm\^online 2 user account and authentication server DOWNGRADE

Affected: 1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy xmonline-2-user-account-and-authentication-server || rpm -q xmonline-2-user-account-and-authentication-server || xmonline-2-user-account-and-authentication-server --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison xmonline-2-user-account-and-authentication-server sudo apt install xmonline-2-user-account-and-authentication-server=<VERSION_BEFORE_1.0.0> sudo apt-mark hold xmonline-2-user-account-and-authentication-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list xmonline-2-user-account-and-authentication-server sudo dnf downgrade xmonline-2-user-account-and-authentication-server-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add xmonline-2-user-account-and-authentication-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-15557?

xm\^online 2 user account and authentication server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-15557 being exploited?

CVE-2019-15557 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-15557 affect?

CVE-2019-15557 affects xm\^online 2 user account and authentication server. Severity is critical (CVSS 9.8). XM^online 2 User Account and Authentication server 1.0.0 allows SQL injection via a tenant key.

How urgent is CVE-2019-15557?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

References

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