*
The payment integration plugins Stripe (included in the core system), pretix-mollie, pretix-oppwa, pretix-bitpay, pretix-payone, pretix-secuconnect, pretix-sofort, and pretix-saferpay
contain a code path that is intended for the transport of session
parameters from a tab with isolated cookies (e.g. in the pretix widget)
to a new tab. For this purpose, a set of session parameters is
cryptographically signed and then passed to the new tab as a URL
parameter. The plugins perform no further validation of the session
parameters, other than the cryptographic signature being valid. This is
fixed with the releases issued today by strictly validating that no
session parameters outside of the scope of the respective plugin may be
set.
*
An unrelated feature in the core system is used to generate redirect links that obfuscate any Referer
headers for outgoing links to prevent leakage of secrets in URLs. This
redirect page also requires cryptographically signed parameters.
Unfortunately, it uses the same key and salt for the signature as the
previously mentioned feature in the payment integration plugins. A
motivated attacker with access to at least one event in the backend can
trick the system into cryptographically signing arbitrary content using
specially crafted links. In combination with the previous issue, the
attacker could use this to set and modify arbitrary parameters on their
user session by injecting the signed parameters into the feature of the
payment providers. This is fixed with the releases issued today by using
different salts for the signature for each plugin and feature.
*
A third, unrelated feature in the core system is used for admin users
to act on behalf of another user, mostly for debugging purposes. With
being able to insert arbitrary parameters into a session, an attacker
can abuse this feature to change their session from their actual user to
any user in the system by guessing a valid user ID. This is fixed with
the release today by requiring unguessable information to be contained
in the session of the user to switch to.
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 | pretix | unaffected |
|
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| pretix | pretix-mollie | unaffected |
|
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| pretix | pretix-oppwa | unaffected |
|
||||||||||||
| pretix | pretix-bitpay | unaffected |
|
||||||||||||
| pretix | pretix-payone | unaffected |
|
||||||||||||
| pretix | pretix-secuconnect | unaffected |
|
||||||||||||
| pretix | pretix-sofort | unaffected |
|
||||||||||||
| pretix | pretix-saferpay | unaffected |
|
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Project Subscriptions
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Solution
No solution given by the vendor.
Workaround
If you are unable to update quickly, we recommend to block the URL /control/users/impersonate/stop in your webserver configuration. In nginx, you can do this by inserting location /control/users/impersonate/stop { deny all; } into the correct block. However, this only remedies the most critical impact the other vulnerabilities have, and we still recommend you plan an update as soon as possible.
| Link | Providers |
|---|---|
| https://pretix.eu/about/en/blog/20260701-release-2026-5-3/ |
|
Wed, 01 Jul 2026 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Wed, 01 Jul 2026 14:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | We found a chain of combining multiple weaknesses in the product that could allow an attacker to become any user in the backend and access any data: * The payment integration plugins Stripe (included in the core system), pretix-mollie, pretix-oppwa, pretix-bitpay, pretix-payone, pretix-secuconnect, pretix-sofort, and pretix-saferpay contain a code path that is intended for the transport of session parameters from a tab with isolated cookies (e.g. in the pretix widget) to a new tab. For this purpose, a set of session parameters is cryptographically signed and then passed to the new tab as a URL parameter. The plugins perform no further validation of the session parameters, other than the cryptographic signature being valid. This is fixed with the releases issued today by strictly validating that no session parameters outside of the scope of the respective plugin may be set. * An unrelated feature in the core system is used to generate redirect links that obfuscate any Referer headers for outgoing links to prevent leakage of secrets in URLs. This redirect page also requires cryptographically signed parameters. Unfortunately, it uses the same key and salt for the signature as the previously mentioned feature in the payment integration plugins. A motivated attacker with access to at least one event in the backend can trick the system into cryptographically signing arbitrary content using specially crafted links. In combination with the previous issue, the attacker could use this to set and modify arbitrary parameters on their user session by injecting the signed parameters into the feature of the payment providers. This is fixed with the releases issued today by using different salts for the signature for each plugin and feature. * A third, unrelated feature in the core system is used for admin users to act on behalf of another user, mostly for debugging purposes. With being able to insert arbitrary parameters into a session, an attacker can abuse this feature to change their session from their actual user to any user in the system by guessing a valid user ID. This is fixed with the release today by requiring unguessable information to be contained in the session of the user to switch to. | |
| Title | Session takeover vulnerability | |
| Weaknesses | CWE-20 CWE-323 |
|
| References |
| |
| Metrics |
cvssV4_0
|
Projects
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MITRE
Status: PUBLISHED
Assigner: rami.io
Published:
Updated: 2026-07-01T15:27:00.431Z
Reserved: 2026-06-29T08:26:50.725Z
Link: CVE-2026-13602
Vulnrichment
Updated: 2026-07-01T15:26:57.313Z
NVD
No data.
Redhat
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OpenCVE Enrichment
Updated: 2026-07-01T20:00:06Z