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NVD / CVE Program· CNA rami.io

CVE-2026-13602: Session takeover vulnerability

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.38% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: pretix pretix 2026.3.5, 2026.4.5, 2026.5.3; pretix pretix-bitpay 1.5.3; pretix pretix-mollie 2.5.7.

Low priority for now. Upgrade to pretix pretix 2026.3.5, 2026.4.5, 2026.5.3; pretix pretix-bitpay 1.5.3; pretix pretix-mollie 2.5.7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.7 · v4.0—No exploit Fix available
Published
Jul 1, 2026
Updated
Jul 2, 2026
EPSS
0.3% · 32th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · rami.io
7.7
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-13602

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (rami.io). Independent of NVD's CPE analysis and usually ahead of it.

  • pretix pretix

    • 4.14.0 and later · before 2026.3.5affected · python
    • 2026.4.0 and later · before 2026.4.5affected · python
    • 2026.5.0 and later · before 2026.5.3affected · python

  • pretix pretix-bitpay

    • before 1.5.3affected · python

  • pretix pretix-mollie

    • before 2.5.7affected · python

  • pretix pretix-oppwa

    • before 1.4.4affected · python

  • pretix pretix-payone

    • before 1.4.3affected · python

  • pretix pretix-saferpay

    • before 1.6.3affected · python

  • pretix pretix-secuconnect

    • before 1.0.4affected · python

  • pretix pretix-sofort

    • before 1.4.2affected · python

Same product

pretix: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-27447pretix before 2024.1.1 mishandles file validation.
    39Monitor
  • CVE-2026-57532Malicious HTML content contained in the layout specification of a PDF ticket or badge layout was executed when the PDF editor is opened in
    35Monitor
  • CVE-2026-2415Unsafe variable evaluation in email templates
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-57533Jun 25, 2026 · Malicious HTML content could be injected into the page pretix shows when redirection to an untrusted page occurs.
    8Monitor
  • ← EarlierCVE-2026-57535Jun 25, 2026 · Content injected to PDF rendering contexts could, in many places, include HTML content including <img> tags.
    8Monitor
  • Later →CVE-2026-101266Sep 29, 2026 · Checkout validation bypass
    5Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
pretix pretix2026.3.5Vendor (CNA)
pretix pretix2026.4.5Vendor (CNA)
pretix pretix2026.5.3Vendor (CNA)
pretix pretix-bitpay1.5.3Vendor (CNA)
pretix pretix-mollie2.5.7Vendor (CNA)
pretix pretix-oppwa1.4.4Vendor (CNA)
pretix pretix-payone1.4.3Vendor (CNA)
pretix pretix-saferpay1.6.3Vendor (CNA)
pretix pretix-secuconnect1.0.4Vendor (CNA)
pretix pretix-sofort1.4.2Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
X

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records