EUVD-2026-83977Published

Hatchet: Cross-Tenant Durable Task Event Log Disclosure via Missing Authorization Check

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-63342

Published

Hatchet is a platform for orchestrating background tasks, AI agents, and durable workflows at scale. Prior to 0.91.1, api-contracts/openapi/paths/v1/workflow-runs/workflow_run.yaml defines the GET /api/v1/stable/durable-tasks/{durable-task} endpoint implemented by listDurableEventLog without requiring the target tenant as a parent resource, allowing an authenticated user who obtains another tenant's durable task UUID to read that task's event log. Disclosed data can include task display names, workflow identifiers, user messages, wait conditions, branching logic, and timing information. This issue is fixed in version 0.91.1.

Source published: 21 Sep 2026 15:44:07 UTC
Source modified: 29 Sep 2026 15:02:14 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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CVSS 3.1 · 6.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

euvd · EUVD-2026-83977

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Sep 21, 2026, 3:44:07 PM

dateUpdated: Sep 29, 2026, 3:02:14 PM

Source published: Sep 21, 2026, 3:44:07 PM (timezone not stated)
Source modified: Sep 29, 2026, 3:02:14 PM (timezone not stated)
Observed here: 11 Nov 2026 15:06:00 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 6.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

nvd · CVE-2026-63342

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Deferred

Weakness classifications: CWE-863

Original publisher date fields

published: 2026-09-21T16:17:10.737

lastModified: 2026-09-29T15:17:27.303

Source published: 21 Sep 2026 16:17:10 UTC
Source modified: 29 Sep 2026 15:17:27 UTC
Observed here: 25 Oct 2026 14:19:28 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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CVSS 3.1 · [email protected] · Secondary · 6.3 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

osv · GHSA-g26x-m427-f48f

Published

### Summary The `GET /api/v1/stable/durable-tasks/{durable-task}` endpoint (`listDurableEventLog`) is missing tenant authorization validation, allowing any authenticated user to read durable task event logs from any tenant. ### Impact This CVE requires the attacker to successfully guess the target UUID. Any authenticated Hatchet user can read durable task event logs from any other tenant, exposing: - Task display names and workflow identifiers - User messages (may contain sensitive business data) - Wait conditions and branching logic - Timing information

Source published: 22 Sep 2026 20:34:14 UTC
Source modified: 1 Oct 2026 20:56:00 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Publisher rating · MODERATE

osv · GO-2026-6567

Published

Hatchet: Cross-Tenant Durable Task Event Log Disclosure via Missing Authorization Check in github.com/hatchet-dev/hatchet

Source published: 1 Oct 2026 20:23:38 UTC
Source modified: 1 Oct 2026 20:45:13 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.