CVE-2026-101049

Heym before 0.0.53 Slack Webhook Signature Verification Bypass

8.3 High

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: High
Availability: None

Exploit likelihood

0.38%Up 0.1 points since Sep 28, 2026

What each source reports

CVE List Score used 8.3

Heym before 0.0.53 Slack Webhook Signature Verification Bypass

Record: CVE-2026-101049
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness: CWE-287
Updated: 2026-11-02

EUVDEUVD-2026-87969 8.3

Record: EUVD-2026-87969
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-2m9j-ffq7-cjqc 8.3

Heym before 0.0.53 fails to verify Slack request signatures when trigger nodes lack credential...

Record: GHSA-2m9j-ffq7-cjqc
CVSS 4.0: 8.3 HighCVSS: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
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness: CWE-287
Updated: 2026-11-02

NVD 8.3

Record: CVE-2026-101049
CVSS 4.0: 8.3 HighCVSS: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
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness: CWE-287
Updated: 2026-11-02

OSVCVE-2026-100865 8.7

Heym before 0.0.53 Remote Code Execution via eval() Sandbox Escape

Heym before 0.0.53 evaluates workflow condition expressions using Python's eval() with insufficient sandboxing in the workflow executor service. Authenticated users can edit workflow condition nodes or import malicious templates to execute arbitrary Python and OS commands as the backend process user.

Record: CVE-2026-100865
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness: CWE-94
Updated: 2026-11-02

OSV 8.3

Heym before 0.0.53 Slack Webhook Signature Verification Bypass

Record: CVE-2026-101049
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-287
Updated: 2026-11-02

OSVCVE-2026-101050 8.3

Heym before 0.0.53 Authentication Bypass via Telegram Webhook

Heym before 0.0.53 fails to verify the X-Telegram-Bot-Api-Secret-Token header on Telegram webhook endpoints when credential_id is absent or secret_token is empty. Remote unauthenticated attackers can post forged Telegram updates to trigger workflows with the owner's configured credentials and execute actions on attacker-supplied input.

Record: CVE-2026-101050
CVSS 4.0: 8.3 HighCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-287
Updated: 2026-11-02

Affected products

heymrun heym

History

History
Recorded	Changed	Sources
Nov 6, 2026	facts
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-101049 is a high vulnerability (CVSS 8.3) in Heymrun Heym, published September 27, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.38%, the 32nd percentile. No source names a fixed version.

References

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