CVE-2026-2452: Emails sent by pretix can utilize placeholders that will be filled with customer data

Routine

MEDIUM 6.5UPGRADEUPGRADE

CVE-2026-2452 is a medium-severity flaw (CVSS 6.5) affecting newsletters, pretix. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Emails sent by pretix can utilize placeholders that will be filled with customer data. For example, when {name} is used in an email template, it will be replaced with the buyer's name for the final email. This mechanism contained a security-relevant bug: It was possible to exfiltrate information about the pretix system through specially crafted placeholder names such as {{event.__init__.__code__.co_filename}}. This way, an attacker with the

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-627
Published	2026-02-16
Last modified	2026-06-17

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

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

Am I affected?

Timeline

2026-02-16 11:15 UTCPublished CVE record published
2026-06-17 10:30 UTCUpdated Record last modified

pretix newsletters UPGRADE

Affected: < 1.6.3 · 2.0.0

Fixed in: 1.6.3

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.6.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade newsletters

Note

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

pretix pretix UPGRADE

Affected: >= 4.16.0 and < 2026.1.1

Fixed in: 2026.1.1

Safe to downgrade to: a release before 4.16.0

1. Check installed version

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

2. UPGRADE to 2026.1.1 (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 4.16.0 (Debian / Ubuntu)

apt-cache madison pretix sudo apt install pretix=<VERSION_BEFORE_4.16.0> 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_4.16.0> 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-2026-2452?

newsletters: upgrade to 1.6.3; pretix: upgrade to 2026.1.1. Exact commands for each OS are on this page.

Is CVE-2026-2452 being exploited?

CVE-2026-2452 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-2026-2452 affect?

CVE-2026-2452 affects newsletters, pretix. Severity is medium (CVSS 6.5). Emails sent by pretix can utilize placeholders that will be filled with customer data. For example, when {name} is used in an email template, it will be replaced with the buyer's name for the final email. This mechanism contained a secur

How urgent is CVE-2026-2452?

Priority 28/100. No elevated risk signals yet.

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References

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