CVE-2026-84207

MEDIUM 5.4

Heym before 0.0.98 SSRF via WebSocket endpoints

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

Heym before 0.0.98 fails to apply SSRF egress guards to WebSocket Send and WebSocket Trigger nodes, allowing authenticated users to connect to internal services. Attackers can craft workflow nodes with arbitrary URLs and headers to reach internal services and read responses from the WebSocket Trigger node.

CWE	CWE-918
Vendor	heymrun
Product	heym
Published	Sep 1, 2026
Last Updated	Sep 1, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Affected Versions

heymrun / heym

0 < 0.0.98

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/heymrun/heym github.com: https://github.com/heymrun/heym/security/advisories/GHSA-mqw6-g845-w596 github.com: https://github.com/heymrun/heym/commit/540aade7c7495295062f32f4dfd0d6805f066f0c github.com: https://github.com/heymrun/heym/releases/tag/v0.0.98 github.com: https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_utils.py github.com: https://github.com/heymrun/heym/blob/v0.0.97/backend/app/services/websocket_trigger_service.py vulncheck.com: https://www.vulncheck.com/advisories/heym-before-0.0.98-ssrf-via-websocket-endpoints

Credits

euriconicacio