CVE-2019-15746: SITOS six Build v6.2.1 allows an attacker to inject arbitrary PHP commands

This month

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2019-15746 is a critical-severity flaw (CVSS 9.8) affecting sitos six. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SITOS six Build v6.2.1 allows an attacker to inject arbitrary PHP commands. As a result, an attacker can compromise the running server and execute system commands in the context of the web user.

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	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-78, CWE-94
Published	2019-10-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sitos

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

Am I affected?

Timeline

2019-10-07 12:15 UTCPublished CVE record published
2026-06-17 02:21 UTCUpdated Record last modified

sitos sitos six DOWNGRADE

Affected: 6.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.2.1

1. Check installed version

apt-cache policy sitos-six || rpm -q sitos-six || sitos-six --version

2. No fixed release: DOWNGRADE to a release before 6.2.1 (Debian / Ubuntu)

apt-cache madison sitos-six sudo apt install sitos-six=<VERSION_BEFORE_6.2.1> sudo apt-mark hold sitos-six

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

dnf --showduplicates list sitos-six sudo dnf downgrade sitos-six-<VERSION_BEFORE_6.2.1> sudo dnf versionlock add sitos-six

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-2019-15746?

sitos six: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-15746 being exploited?

CVE-2019-15746 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-2019-15746 affect?

CVE-2019-15746 affects sitos six. Severity is critical (CVSS 9.8). SITOS six Build v6.2.1 allows an attacker to inject arbitrary PHP commands. As a result, an attacker can compromise the running server and execute system commands in the context of the web user.

How urgent is CVE-2019-15746?

Priority 59/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

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CVE-2019-15747 HIGH 8.8 DOWNGRADE SITOS six Build v6.2.1 allows a user with the user role of Seminar Coordinator to escalate their permission to

References

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