stoatchat (delta/Revolt) versions from 20241213-1 before 20250210-1 allow users with only ViewChannel (read) permission on a channel to fetch that channel's webhooks, including their tokens, because the webhook fetch endpoint checked for ViewChannel instead of ManageWebhooks. Using a retrieved token, an attacker can send arbitrary messages to the channel, bypassing channel permissions and impersonating a bot or webhook. Fixed in 20250210-1 (0.8.2).
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products
stoatchat:stoatchat
References 3
https://github.com/stoatchat/stoatchat/commit/e3723d647effb81ea3d3919d848faf64d…
disclosure@vulncheck.com
https://github.com/stoatchat/stoatchat/security/advisories/GHSA-8684-rvfj-v3jq
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/stoatchat-20241213-1-webhook-token-disclos…
disclosure@vulncheck.com