# Multitenancy: extend isolation into the cache

https://thiago.limaesilvatecnologia.com.br/en/artigos/tenant-cache-isolation/

Published: 2026-09-12

Correct database and API controls cannot fix ambiguous cache keys.

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Reading-path month: May 2026

Collection published on September 12, 2026. Months organize the reading path; they are not earlier publication dates.

A short architecture article. The technical reference supports the topic; hypothetical scenarios and assessment proposals are editorial analysis, not accounts of personal implementations.

## The architecture decision

A response may be authorized correctly and later reused in the wrong context. Shared systems need cache-path reviews alongside original queries.

## Practical application

Editorial proposal: model tenant identity in writes, reads, invalidation and background jobs. For a hypothetical report, consider parameters and access scope determining whether responses are interchangeable.

## How to verify

Create synthetic tenants with identical local identifiers and different data. Alternate calls and invalidations while inspecting results. Require no context mixing, including after permission changes. Document how one tenant's cleanup affects others.

## Sources

- [OWASP — Multi Tenant Security Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Multi_Tenant_Security_Cheat_Sheet.html). Accessed: 2026-09-12.

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