CVE-2026-13602: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-q93m-6jvc-jc45
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CWE-20
Published
Advisory Summary

CVE-2026-13602 is a HIGH security vulnerability vulnerability (CWE-20: Improper Input Validation) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.. Remediation is available in the latest vendor maintenance releases.

CVE-2026-13602 at a Glance

CVE Identifier CVE-2026-13602
GHSA Identifier GHSA-q93m-6jvc-jc45
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-20: Improper Input Validation
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-13602

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-13602, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

References

NVD — CVE-2026-13602 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-13602
pretix.eu/about/en/blog/20260... WEB
https://pretix.eu/about/en/blog/20260701-release-2026-5-3

Frequently Asked Questions

What is CVE-2026-13602?
CVE-2026-13602 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-20: Improper Input Validation.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-13602?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-13602?
CVE-2026-13602 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Maven dependencies for CVE-2026-13602?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-q93m-6jvc-jc45",
  "modified" : "2026-07-01T15:35:20Z",
  "published" : "2026-07-01T15:35:20Z",
  "aliases" : [ "CVE-2026-13602" ],
  "details" : "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:\n\n\n\n\n\n\n\n  *  \n\n\nThe payment integration plugins Stripe (included in the core system), pretix-mollie, pretix-oppwa, pretix-bitpay, pretix-payone, pretix-secuconnect, pretix-sofort, and pretix-saferpay\n contain a code path that is intended for the transport of session \nparameters from a tab with isolated cookies (e.g. in the pretix widget) \nto a new tab. For this purpose, a set of session parameters is \ncryptographically signed and then passed to the new tab as a URL \nparameter. The plugins perform no further validation of the session \nparameters, other than the cryptographic signature being valid. This is \nfixed with the releases issued today by strictly validating that no \nsession parameters outside of the scope of the respective plugin may be \nset.\n\n\n\n\n  *  \n\n\nAn unrelated feature in the core system is used to generate redirect links that obfuscate any Referer\n headers for outgoing links to prevent leakage of secrets in URLs. This \nredirect page also requires cryptographically signed parameters. \nUnfortunately, it uses the same key and salt for the signature as the \npreviously mentioned feature in the payment integration plugins. A \nmotivated attacker with access to at least one event in the backend can \ntrick the system into cryptographically signing arbitrary content using \nspecially crafted links. In combination with the previous issue, the \nattacker could use this to set and modify arbitrary parameters on their \nuser session by injecting the signed parameters into the feature of the \npayment providers. This is fixed with the releases issued today by using\n different salts for the signature for each plugin and feature.\n\n\n\n\n  *  \n\n\nA third, unrelated feature in the core system is used for admin users\n to act on behalf of another user, mostly for debugging purposes. With \nbeing able to insert arbitrary parameters into a session, an attacker \ncan abuse this feature to change their session from their actual user to\n any user in the system by guessing a valid user ID. This is fixed with\n the release today by requiring unguessable information to be contained \nin the session of the user to switch to.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-13602"
  }, {
    "type" : "WEB",
    "url" : "https://pretix.eu/about/en/blog/20260701-release-2026-5-3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-20" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-07-01T15:16:29Z"
  }
}