CVE-2026-101049CWE-287

CVE-2026-101049

Medium · published September 27, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
21.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
CVSS v4.0
8.3 · 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
EPSS
0.00297 · 21.2th percentile
Weakness
CWE-287 · Improper Authentication
Published
2026-09-27T21:16Z
References (4)
https://github.com/heymrun/heym/commit/341d1012367cd74f85c617e1c98dd49e3fcb5e83 · [email protected]https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h · [email protected]https://www.vulncheck.com/advisories/heym-before-0.0.53-slack-webhook-signature-verification-bypass · [email protected]https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 29 SEP 03:24Z
    EPSS moved — → 0%
    epss
  • 27 SEP 16:28Z
    Heym before 0.0.53 Slack Webhook Signature Verification Bypass
    cvelistv5