CVE-2026-101274

What it is

When pretix is used as the identity provider in a Single-Sign-On (SSO) setup for customer accounts, the system did not properly validate the `response_type` requested in an authorization request against the configured grant type of the SSO client. This means that if an SSO client was configured to only allow the `code` response type, which requires knowledge of the client secret to use and would wrongfully send a response type like `id_token`, it would receive back a valid token. Exploiting this requires the attacker to run JavaScript on the page specified by `redirect_uri`, which must be from a list specified in the client configuration.

At a glance

Exploitability

Can be exploited over the network with an admin-level account, but needs a user to act. High risk of data exposure.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-09-28 11:48 UTC ReservedThe CVE id was reserved by its CNA
2. 2026-10-28 11:17 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-11-05 17:17 UTC Last updatedMost recent change to the record

Details

Published

2026-10-28 11:17 UTC

Last modified

2026-11-05 17:17 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-306 · Missing authentication

Record status

Deferred

Attack profile CVSS 4.0 · 6.9

Attack vector

Network

Complexity

Low

Attack requirements

Present

Privileges needed

High

User interaction

Passive

Confidentiality

High

Integrity

Low

Availability

None