CVE-2026-101049 Heym before 0.0.53 Slack Webhook Signature Verification Bypass
Remote attackers can bypass Slack signature verification to trigger workflows with owner credentials when signing secrets are missing or empty.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-101049?
CVE-2026-101049 is a high-severity authentication bypass vulnerability in heymrun heym, published on 27 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-287
Which versions are affected by CVE-2026-101049?
How do I fix CVE-2026-101049?
No fix has been published for CVE-2026-101049 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-101049 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101049 exists.
Sources
Also known as GHSA-2m9j-ffq7-cjqc.