CVE-2019-19033: Jalios JCMS 10 allows attackers to access any part of the website and the WebDAV server with administrative pr

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2019-19033 is a critical-severity flaw (CVSS 9.8) affecting jcms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Jalios JCMS 10 allows attackers to access any part of the website and the WebDAV server with administrative privileges via a backdoor account, by using any username and the hardcoded dev password.

Why this priority

Critical severity
Public exploit reference
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	3.3% (top 11%)
CISA exploited list	No
Weakness	CWE-798
Published	2019-11-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: jalios

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

Am I affected?

Timeline

2019-11-21 18:15 UTCPublished CVE record published
2026-06-17 02:26 UTCUpdated Record last modified

jalios jcms DOWNGRADE

Affected: 10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

1. Check installed version

apt-cache policy jcms || rpm -q jcms || jcms --version

2. No fixed release: DOWNGRADE to a release before 10.0 (Debian / Ubuntu)

apt-cache madison jcms sudo apt install jcms=<VERSION_BEFORE_10.0> sudo apt-mark hold jcms

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

dnf --showduplicates list jcms sudo dnf downgrade jcms-<VERSION_BEFORE_10.0> sudo dnf versionlock add jcms

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-2019-19033?

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

Is CVE-2019-19033 being exploited?

CVE-2019-19033 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-2019-19033 affect?

CVE-2019-19033 affects jcms. Severity is critical (CVSS 9.8). Jalios JCMS 10 allows attackers to access any part of the website and the WebDAV server with administrative privileges via a backdoor account, by using any username and the hardcoded dev password.

How urgent is CVE-2019-19033?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2020-15497 MEDIUM 5.3 DOWNGRADE jcore/portal/ajaxPortal.jsp in Jalios JCMS 10.0.2 build-20200224104759 allows XSS via the types parameter

References

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