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

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-31946 is a critical-severity flaw (CVSS 9.8) 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. From version 10.5.4 to before version 20.2.5, OpenOLAT's OpenID Connect implicit flow implementation does not verify JWT signatures. The JSONWebToken.parse() method silently discards the signature segment of the compact JWT (header.payload.signature), and the getAccessToken() methods in both OpenIdConnectApi and OpenIdConnectFullConfigur

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-287, CWE-347
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 10:34 UTCUpdated Record last modified

frentix openolat UPGRADE

Affected: >= 10.5.4 and < 20.2.5

Fixed in: 20.2.5

Safe to downgrade to: a release before 10.5.4

1. Check installed version

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

2. UPGRADE to 20.2.5 (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 10.5.4 (Debian / Ubuntu)

apt-cache madison openolat sudo apt install openolat=<VERSION_BEFORE_10.5.4> 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_10.5.4> 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-2026-31946?

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

Is CVE-2026-31946 being exploited?

CVE-2026-31946 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-2026-31946 affect?

CVE-2026-31946 affects openolat. Severity is critical (CVSS 9.8). OpenOlat is an open source web-based e-learning platform for teaching, learning, assessment and communication. From version 10.5.4 to before version 20.2.5, OpenOLAT's OpenID Connect implicit flow implementation does not verify JWT signatur

How urgent is CVE-2026-31946?

Priority 42/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-28228 HIGH 8.8 UPGRADE OpenOlat is an open source web-based e-learning platform for teaching, learning, assessment and communication

References

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