Session takeover vulnerability

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Summary

CVECVE-2026-13602
StatePUBLISHED
Assignerrami.io
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-01 15:16:29 UTC
Updated2026-07-02 18:43:45 UTC
DescriptionWe 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.

Risk And Classification

Primary CVSS: v4.0 7.7 HIGH from 655498c3-6ec5-4f0b-aea6-853b334d05a6

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.002390000 probability, percentile 0.148270000 (date 2026-07-03)

Problem Types: CWE-20 | CWE-323 | CWE-20 CWE-20 Improper input validation | CWE-323 CWE-323 Reusing a nonce, key pair in encryption

VersionSourceTypeScoreSeverityVector
4.0655498c3-6ec5-4f0b-aea6-853b334d05a6Secondary7.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/C...
4.0CNACVSS7.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
High
Sub Integrity
High
Sub Availability
High

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Pretix Pretix affected 4.14.0 2026.3.5 python Not specified
CNA Pretix Pretix affected 2026.4.0 2026.4.5 python Not specified
CNA Pretix Pretix affected 2026.5.0 2026.5.3 python Not specified
CNA Pretix Pretix-mollie affected 2.5.7 python Not specified
CNA Pretix Pretix-oppwa affected 1.4.4 python Not specified
CNA Pretix Pretix-bitpay affected 1.5.3 python Not specified
CNA Pretix Pretix-payone affected 1.4.3 python Not specified
CNA Pretix Pretix-secuconnect affected 1.0.4 python Not specified
CNA Pretix Pretix-sofort affected 1.4.2 python Not specified
CNA Pretix Pretix-saferpay affected 1.6.3 python Not specified

References

ReferenceSourceLinkTags
pretix.eu/about/en/blog/20260701-release-2026-5-3 655498c3-6ec5-4f0b-aea6-853b334d05a6 pretix.eu
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Workarounds

CNA: 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.

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