Unauthenticated Access Vulnerability in Grafana OnCall
CVE-2026-63087

9.3CRITICAL

Key Information:

Vendor

Grafana-cold-storage

Status
Oncall
Vendor
CVE Published:
16 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-63087?

Grafana OnCall up to version 1.16.11 is susceptible to an unauthenticated access vulnerability that enables remote attackers to retrieve a valid PluginAuthToken. By exploiting a flaw in the internal plugin install endpoint and using hardcoded default stack_id and org_id values, attackers can gain unauthorized access. Once they acquire this token, they can authenticate against various internal API endpoints, create unauthorized Admin users through the user-context header bootstrap path, revoke legitimate plugin tokens, and even redirect API calls to an attacker-controlled server by manipulating the organization's grafana_url and api_token settings.

Affected Version(s)

oncall 0 <= 1.16.11

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-63087 - Proof of Concept

References

https://github.com/geo-chen/oss/blob/main/oncall.md
technical-descriptionexploit
https://www.vulncheck.com/advisories/grafana-oncall-unaut...
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.