# Will Depue alleges Anthropic underplays a Slack breach by Cathedral

> Original title: anthropic is massively underplaying the recent security breach. i'm hearing cathedral achieved full administrator access of the slack wor...

- Source: will depue
- Published: 2026-10-28T00:18:55.000Z
- Bad Influence: https://badinfluence.news/items/k8nfktyp6iaqfi1s3ba946wow
- Original: https://x.com/willdepue/status/2115236836092313988

## Summary

Will Depue, an OpenAI employee, says he has heard that Cathedral gained full administrator access to Anthropic's Slack workspace, exposing every message and research secret. He says Anthropic and OpenAI keep much of their internal work in Slack, and compares the incident to OpenAI's 2023 breach through an external app's access token. These are unverified claims from a social media post.

## Post

anthropic is massively underplaying the recent security breach. i'm hearing cathedral achieved full administrator access of the slack workspace (see every message, log in as arbitrary users) where literally every single research secret is contained

to those unfamiliar: Ant & OAI keep literally everything in Slack. it sounds exactly the same incident that happened to OpenAI in 2023, where OpenAI was hacked by a random guy who got access to an access token from an external app service

"we're critical to national security, we must beat China, and yes we keep all our crown jewels in Salesforce's Slack messenger. yes we have admin API tokens everywhere. why do you ask?"