Advisories

Heym before 0.0.53 Slack Webhook Signature Verification Bypass

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severity
high
date
Affecting
  • heym >= 0, < 0.0.53

CWE
  • CWE-287 Improper Authentication
CVSS
8.3
CVSS V3 Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Credit
okcomputerfan, mbakgun
Description
Heym before 0.0.53 fails to verify Slack request signatures when trigger nodes lack credential IDs or have empty signing secrets. Remote unauthenticated attackers can send forged Slack events to known webhook URLs to trigger workflows with the owner's credentials.

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