CVE-2020-6856: An XML External Entity (XEE) vulnerability exists in the JOC Cockpit component of SOS JobScheduler 1.12 and 1.

Routine

MEDIUM 6.5DOWNGRADE

CVE-2020-6856 is a medium-severity flaw (CVSS 6.5) affecting jobscheduler. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An XML External Entity (XEE) vulnerability exists in the JOC Cockpit component of SOS JobScheduler 1.12 and 1.13.2 allows attackers to read files from the server via an entity declaration in any of the XML documents that are used to specify the run-time settings of jobs and orders.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-776
Published	2020-02-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: sos-berlin

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

Am I affected?

Timeline

2020-02-06 17:15 UTCPublished CVE record published
2026-06-17 03:23 UTCUpdated Record last modified

sos-berlin jobscheduler DOWNGRADE

Affected: 1.11 · 1.13.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.11

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.11 (Debian / Ubuntu)

apt-cache madison jobscheduler sudo apt install jobscheduler=<VERSION_BEFORE_1.11> sudo apt-mark hold jobscheduler

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

dnf --showduplicates list jobscheduler sudo dnf downgrade jobscheduler-<VERSION_BEFORE_1.11> sudo dnf versionlock add jobscheduler

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-2020-6856?

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

Is CVE-2020-6856 being exploited?

CVE-2020-6856 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-2020-6856 affect?

CVE-2020-6856 affects jobscheduler. Severity is medium (CVSS 6.5). An XML External Entity (XEE) vulnerability exists in the JOC Cockpit component of SOS JobScheduler 1.12 and 1.13.2 allows attackers to read files from the server via an entity declaration in any of the XML documents that are used to specify

How urgent is CVE-2020-6856?

Priority 38/100. No elevated risk signals yet.

Related CVEs

CVE-2023-37272 MEDIUM 6.3 UPGRADE JS7 is an Open Source Job Scheduler
CVE-2020-6855 MEDIUM 6.5 DOWNGRADE A large or infinite loop vulnerability in the JOC Cockpit component of SOS JobScheduler 1.11 and 1.13.2 allows
CVE-2020-6854 MEDIUM 5.4 DOWNGRADE A cross-site scripting (XSS) vulnerability in the JOC Cockpit component of SOS JobScheduler 1.11 and 1.13.2 al
CVE-2020-12712 HIGH 7.5 UPGRADE A vulnerability based on insecure user/password encryption in the JOE (job editor) component of SOS JobSchedul
CVE-2014-5393 MEDIUM 4.0 UPGRADE Directory traversal vulnerability in the JobScheduler Operations Center (JOC) in SOS JobScheduler before 1.6.4

References

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