# CVE-2026-63087: Grafana OnCall authentication bypass in plugin install endpoint

Source: https://junglewise.ai/threats/cve-2026-63087-grafana-oncall-authentication-bypass-in-plugin-install-endpoint  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-16. Updated: 2026-07-16  
License: CC BY 4.0 with a link back

CVE-2026-63087 · Severity: critical · CVSS 9.8 · Published 2026-07-16

Grafana OnCall is an incident response tool used to manage on-call rotations and alerts. A security flaw allows unauthorized individuals to gain full administrative control over the system by exploiting a weakness in how the software handles plugin installations. An attacker could use this access to steal sensitive data, create new administrator accounts, or redirect communications to a malicious server, potentially disrupting emergency response operations.

Vendors: [Grafana](https://junglewise.ai/threats/vendors/grafana).

## Quick answers

**Is CVE-2026-63087 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63087 being exploited in the wild.

**How severe is CVE-2026-63087?** Critical severity, with a CVSS score of 9.8, published 16 July 2026.

**Which products and versions are affected?** Grafana OnCall through 1.16.11.

**Is there a fix for CVE-2026-63087?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-63087 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-63087?** Check whether you run Grafana OnCall at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An unauthenticated access vulnerability (CWE-306) exists in Grafana OnCall through version 1.16.11 due to a lack of authentication on the internal plugin installation endpoint. By sending a POST request to '/api/internal/v1/plugin/v2/install/' using hardcoded 'stack_id' and 'org_id' values found in the public source tree, a remote attacker can obtain a valid 'PluginAuthToken'. This token grants access to all internal API endpoints. Attackers can subsequently create arbitrary Admin users via the user-context header bootstrap path, revoke legitimate tokens, and hijack OnCall-to-Grafana communications by overwriting the 'grafana_url' and 'api_token' settings. The repository was archived in June 2026, and no official patch is currently noted.

## Affected products

- Grafana OnCall through 1.16.11

## Timeline

- 2026-06-05: other: Repository archived by owner
- 2026-07-16: advisory: CVE published to NVD

## References

- [https://github.com/geo-chen/oss/blob/main/oncall.md](https://github.com/geo-chen/oss/blob/main/oncall.md)
- [https://www.vulncheck.com/advisories/grafana-oncall-unauthenticated-token-hijack-via-plugin-install-endpoint](https://www.vulncheck.com/advisories/grafana-oncall-unauthenticated-token-hijack-via-plugin-install-endpoint)