CVE-2026-28228: OpenOlat is an open source web-based e-learning platform for teaching, learning, assessment and communication

This month

HIGH 8.8UPGRADE

CVE-2026-28228 is a high-severity flaw (CVSS 8.8) affecting openolat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenOlat is an open source web-based e-learning platform for teaching, learning, assessment and communication. Prior to versions 19.1.31, 20.1.18, and 20.2.5, an authenticated user with the Author role can inject Velocity directives into a reminder email template. When the reminder is processed (either triggered manually or via the daily cron job), the injected directives are evaluated server-side. By chaining Velocity's #set directive with Java

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-1336
Published	2026-03-30
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: frentix

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

Am I affected?

Timeline

2026-03-30 21:17 UTCPublished CVE record published
2026-06-17 10:28 UTCUpdated Record last modified

frentix openolat UPGRADE

Affected: < 19.1.31 · >= 20.0.0 and < 20.1.18 · >= 20.2.0 and < 20.2.5

Fixed in: 19.1.31, 20.1.18, 20.2.5

Safe to downgrade to: a release before 20.0.0

1. Check installed version

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

2. UPGRADE to 19.1.31 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openolat

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openolat

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 20.0.0 (Debian / Ubuntu)

apt-cache madison openolat sudo apt install openolat=<VERSION_BEFORE_20.0.0> sudo apt-mark hold openolat

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openolat sudo dnf downgrade openolat-<VERSION_BEFORE_20.0.0> sudo dnf versionlock add openolat

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-2026-28228?

openolat: upgrade to 19.1.31, 20.1.18, 20.2.5. Exact commands for each OS are on this page.

Is CVE-2026-28228 being exploited?

CVE-2026-28228 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-2026-28228 affect?

CVE-2026-28228 affects openolat. Severity is high (CVSS 8.8). OpenOlat is an open source web-based e-learning platform for teaching, learning, assessment and communication. Prior to versions 19.1.31, 20.1.18, and 20.2.5, an authenticated user with the Author role can inject Velocity directives into a

How urgent is CVE-2026-28228?

Priority 40/100. High severity

Software pages

Java vulnerabilities

Related CVEs

CVE-2026-31946 CRITICAL 9.8 UPGRADE OpenOlat is an open source web-based e-learning platform for teaching, learning, assessment and communication

References

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