Improper Validation of response_type Enables Unauthorized Token Issuance in pretix SSO
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| pretix | unaffected |
|
No data.
No data.
| Vendor | Product | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pretix | Pretix |
|
No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.372% probability within 30 days)
| Link | Providers |
|---|---|
| https://pretix.eu/about/en/blog/20261028-release-2026-8-1/ |
|
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Improper Validation of response_type Enables Unauthorized Token Issuance in pretix SSO |
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Identity Provider Response Type Validation Bypass in SSO Leading to Token Acquisition | |
| Weaknesses | CWE-20 CWE-285 |
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-306 |
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Pretix
Pretix pretix |
|
| Vendors & Products |
Pretix
Pretix pretix |
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Identity Provider Response Type Validation Bypass in SSO Leading to Token Acquisition | |
| Weaknesses | CWE-20 CWE-285 |
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| References |
| |
| Metrics |
cvssV4_0
|