EUVD-2026-87970
GHSA-2x2v-2gpw-j9ff
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
Remote unauthenticated (AV:N/PR:N/UI:N); AC:H because it only works when the secret_token is left empty; integrity-high (workflows run with owner creds), limited confidentiality, no availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Heym deployments prior to 0.0.53 leave their Telegram webhook endpoints without verification of the X-Telegram-Bot-Api-Secret-Token header whenever the endpoint has no credential_id or an empty secret_token, so remote unauthenticated attackers who know the webhook URL can POST forged Telegram updates and cause the owner's configured workflows to run with the owner's stored credentials. The flaw is a fail-open authentication check (CWE-287) rated 8.3 with an assessed CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N profile - confidentiality exposure is limited while integrity impact is high, since attacker-supplied input is processed under the victim's credentials. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a Heym instance (before 0.0.53) whose Telegram webhook endpoint is deployed WITHOUT a configured secret token - specifically where credential_id is absent OR secret_token is empty; in that state the X-Telegram-Bot-Api-Secret-Token header is never verified and any forged POST is accepted. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine authentication-bypass flaw with a fail-open logic error confirmed by the vendor patch (commit 341d1012, which explicitly migrated the sibling Slack path to 'fail closed'). … 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 | Upgrade to Heym 0.0.53 or later, which is the first release containing the fix; the correcting change is commit https://github.com/heymrun/heym/commit/341d1012367cd74f85c617e1c98dd49e3fcb5e83 and is documented in 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 every Heym instance in the environment and determine which are running versions prior to 0.0.53 and have Telegram webhook endpoints configured without a secret token set; for any confirmed at-risk instance, disable the Telegram webhook endpoint or block inbound webhook traffic at the network edge, and unregister or pause the associated Telegram bot until remediation is complete. …
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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