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Medium 6.5Published Sep 27, 2026
CVE-2026-101049Heym before 0.0.53 Slack Webhook Signature Verification Bypass
Updated under an hour ago ()
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It affects heymrun heym. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
- Weakness (CWE)
- CWE-287
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
heymrun heym heymrun:heym (from the name) | before 0.0.53; 0.0.53 not affected | CNA record |
References
- https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38hvendor-advisory
- https://github.com/heymrun/heym/commit/341d1012367cd74f85c617e1c98dd49e3fcb5e83patch
- https://www.vulncheck.com/advisories/heym-before-0.0.53-slack-webhook-signature-verification-bypassthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.