CVE-2026-5600: A new API endpoint introduced in pretix 2025 that is supposed to return all check-in events of a specific eve

Routine

MEDIUM 4.3UPGRADE

CVE-2026-5600 is a medium-severity flaw (CVSS 4.3) affecting pretix. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A new API endpoint introduced in pretix 2025 that is supposed to return all check-in events of a specific event in fact returns all check-in events belonging to the respective organizer. This allows an API consumer to access information for all other events under the same organizer, even those they should not have access to. These records contain information on the time and result of every ticket scan as well as the ID of the matched ticket

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-653
Published	2026-04-08
Last modified	2026-07-24

Publisher (CNA): rami.io · Vendor: pretix

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-08 13:16 UTCPublished CVE record published
2026-07-24 20:10 UTCUpdated Record last modified

pretix pretix UPGRADE

Affected: >= 2025.10.0 and < 2026.1.2 · >= 2026.2.0 and < 2026.2.1 · >= 2026.3.0 and < 2026.3.1

Fixed in: 2026.1.2, 2026.2.1, 2026.3.1

Safe to downgrade to: a release before 2025.10.0

1. Check installed version

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

2. UPGRADE to 2026.1.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pretix

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 2025.10.0 (Debian / Ubuntu)

apt-cache madison pretix sudo apt install pretix=<VERSION_BEFORE_2025.10.0> sudo apt-mark hold pretix

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

dnf --showduplicates list pretix sudo dnf downgrade pretix-<VERSION_BEFORE_2025.10.0> sudo dnf versionlock add pretix

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-2026-5600?

pretix: upgrade to 2026.1.2, 2026.2.1, 2026.3.1. Exact commands for each OS are on this page.

Is CVE-2026-5600 being exploited?

CVE-2026-5600 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-2026-5600 affect?

CVE-2026-5600 affects pretix. Severity is medium (CVSS 4.3). A new API endpoint introduced in pretix 2025 that is supposed to return all check-in events of a specific event in fact returns all check-in events belonging to the respective organizer. This allows an API consumer to access information

How urgent is CVE-2026-5600?

Priority 19/100. No elevated risk signals yet.

References

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