OpenChoreo: Unauthenticated build/workflow trigger via git-provider confusion (webhook signature bypass)

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-73840: 0.35% estimated exploitation activity in the next 30 days; percentile 28.27 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The OpenChoreo autobuild webhook endpoint (POST /api/v1alpha1/autobuild) selected the git provider used to authenticate an incoming webhook from a client-supplied request header rather than from the target component's configuration, and its Bitbucket provider accepted requests without a valid signature. A caller could set the X-Event-Key header to be treated as a Bitbucket webhook, bypassing the HMAC secret that otherwise protects GitHub and GitLab webhooks, and trigger a component build without authenticating. Impact An attacker who can reach the autobuild webhook endpoint and knows the repository URL and branch configured for an auto-build component can trigger a build for that component without authenticating — including components configured for GitHub or GitLab, since the provider used or verification is chosen by the caller rather than by the component's configuration. The triggered build runs against a commit SHA supplied by the attacker, and the component lookup is…

Published by the source

2 Sep 2026, 23:45 UTC

Last modified by the source

10 Sep 2026, 15:15 UTC

Source last checked

26 Oct 2026, 15:29 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-c5f6-2rm9-2w8g

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6360

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-c5f6-2rm9-2w8g

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# Patch Next advisory brief: CVE-2026-73840

Advisory: OpenChoreo: Unauthenticated build/workflow trigger via git-provider confusion (webhook signature bypass)
IDs: CVE-2026-73840, GHSA-c5f6-2rm9-2w8g
Record: https://patchnext.com/advisories/cve-2026-73840 (revision 3, source checked 26 Oct 2026, 15:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/openchoreo/openchoreo 1.2.0-rc.2, 1.1.3, 1.0.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/openchoreo/openchoreo: affected < 1.0.3; >= 1.1.0, < 1.1.3; >= 1.2.0-rc.1, < 1.2.0-rc.2; fixed in 1.2.0-rc.2, 1.1.3, 1.0.3

## Suggested inspection (read-only)
- Go github.com/openchoreo/openchoreo: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/openchoreo/openchoreo.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-c5f6-2rm9-2w8g (OSV record GHSA-c5f6-2rm9-2w8g lists affected ranges: Go github.com/openchoreo/openchoreo >=0 =1.1.0 =1.2.0-rc.1 <1.2.0-rc.2 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6360 (OSV record GO-2026-6360 lists affected ranges: Go github.com/openchoreo/openchoreo >=0 =1.1.0 =1.2.0-rc.1 <1.2.0-rc.2 (fixed))
- Verified: https://github.com/advisories/GHSA-c5f6-2rm9-2w8g (GitHub-reviewed advisory GHSA-c5f6-2rm9-2w8g lists affected ranges: Go github.com/openchoreo/openchoreo >=0 =1.1.0 =1.2.0-rc.1 <1.2.0-rc.2)

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