EUVD-2026-87969
GHSA-2m9j-ffq7-cjqc
Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable and unauthenticated (PR:N/AV:N), but AC:H because it needs a misconfigured node plus a known webhook URL; workflows run with owner creds gives I:H, minor C:L, no A impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Forged Slack webhook events can trigger Heym workflows with the owner's credentials because Heym before 0.0.53 skips Slack request-signature verification whenever a Slack trigger node has no credential ID or an empty signing secret (a fail-open code path). The bypass is unauthenticated (CVSS 4.0 PR:N) but conditionally gated: it only works against trigger nodes that are misconfigured this way, and the attacker must know or discover the target's webhook URL - a properly configured node with a valid signing secret is not exploitable, which is why the assessed severity carries AC:H. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a Heym Slack trigger node configured WITHOUT a credential ID or with an EMPTY signing secret - under that misconfiguration the code path skipped signature verification entirely (fail-open). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but conditionally-gated authentication-bypass. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade Heym to 0.0.53 or later, which makes Slack signature verification fail closed; the fix is in commit 341d1012367cd74f85c617e1c98dd49e3fcb5e83 and is documented in advisory GHSA-pm6h-x3h5-j38h (https://github.com/heymrun/heym/security/advisories/GHSA-pm6h-x3h5-j38h). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Heym instances and identify the running version, then immediately remediate any Slack trigger node missing a credential ID or configured with an empty signing secret, since these misconfigured nodes are the only exploitable path; if compensating configuration cannot be applied immediately, restrict inbound access to Heym webhook endpoints at the network or reverse-proxy layer so only Slack's published source ranges can reach them. …
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Same weakness CWE-287 – Improper Authentication
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today