CVE-2021-37697: Sensitive information leak in Welcome of tmerc-cogs

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-11 · updated 2026-06-17
Weakness: CWE-306

Description

tmerc-cogs are a collection of open source plugins for the Red Discord bot. A vulnerability has been found in the code that allows any user to access sensitive information by crafting a specific membership event message. Issue is patched in commit d63c49b4cfc30c795336e4fff08cba3795e0fcc0. As a workaround users may unload the Welcome cog.

Affected products

tmercswims tmerc-cogs: before 3.0 — fixed in 3.0

How to fix

Upgrade to a fixed version: tmercswims tmerc-cogs 3.0. Check the vendor advisory for mitigations.

References

https://github.com/tmercswims/tmerc-cogs/commit/d63c49b4cfc30c795336e4fff08cba3795e0fcc0
https://github.com/tmercswims/tmerc-cogs/security/advisories/GHSA-77xv-8c2x-j96j
https://github.com/tmercswims/tmerc-cogs/commit/d63c49b4cfc30c795336e4fff08cba3795e0fcc0
https://github.com/tmercswims/tmerc-cogs/security/advisories/GHSA-77xv-8c2x-j96j

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