CVE-2026-33377: Dashboard Privilege Escalation Vulnerability

CVE-2026-33377 Overview

CVE-2026-33377 is a privilege escalation vulnerability in Grafana that allows an authenticated user with the Editor role to overwrite a dashboard they do not own and gain administrative control over that specific dashboard. The flaw requires the attacker to already possess write access to the target dashboard. Successful exploitation grants the Editor full administrative authority over the affected dashboard, including the ability to modify permissions and reassign ownership.

Critical Impact

An Editor-level user can escalate to dashboard administrator by overwriting an existing dashboard, breaking the intended access control boundary between editors and owners.

Affected Products

• Grafana (refer to the vendor advisory for affected version ranges)

Discovery Timeline

• 2026-05-13 - CVE-2026-33377 published to NVD
• 2026-05-13 - Last updated in NVD database

Technical Details for CVE-2026-33377

Vulnerability Analysis

The vulnerability is a broken access control issue [CWE-284] in Grafana's dashboard management workflow. An Editor with write access to a dashboard can issue an overwrite operation against a dashboard owned by another user. The overwrite path does not properly enforce ownership checks before granting elevated permissions on the resulting dashboard.

The consequence is vertical privilege escalation scoped to a single dashboard object. The attacker does not gain global Grafana administrator rights, but acquires admin permissions on the targeted dashboard. From there, the attacker can alter permissions, remove legitimate collaborators, modify queries, and change data source bindings on that dashboard.

The attack is network-based and requires low privileges and no user interaction. The integrity impact is high because dashboard content and access controls can be altered, while confidentiality impact is limited to data exposed through the dashboard.

Root Cause

The root cause is an authorization gap in the dashboard overwrite handler. Grafana grants the calling user administrative permissions on the dashboard after a successful overwrite without re-validating that the user is the legitimate owner. The pre-existing write permission is treated as sufficient to also confer admin permissions.

Attack Vector

An authenticated Editor with write access to a target dashboard sends an overwrite request through the Grafana dashboard API. After the operation completes, the Editor holds admin permissions on that dashboard. The attacker can then modify the dashboard's access control list, remove the original owner, or pivot to manipulate displayed data and queries.

No verified public exploit code is available. Refer to the Grafana Security Advisory CVE-2026-33377 for technical specifics.

Detection Methods for CVE-2026-33377

Indicators of Compromise

• Dashboard overwrite API calls (POST /api/dashboards/db) issued by Editor accounts against dashboards they do not own.
• Sudden changes to dashboard permission ACLs where the modifying user was not previously an admin on that dashboard.
• Unexpected removal or downgrade of original dashboard owners from permission lists.

Detection Strategies

• Review Grafana audit logs for dashboard.save or overwrite events correlated with subsequent dashboard.permissions changes by the same non-owner user.
• Alert on permission grants where the actor's role is Editor but the resulting permission level is Admin on a dashboard.
• Baseline normal dashboard editing patterns per user and flag Editors performing overwrites across many unrelated dashboards.

Monitoring Recommendations

• Enable Grafana audit logging and forward events to a centralized SIEM for correlation and retention.
• Monitor API authentication tokens used by Editor accounts for anomalous activity volume or off-hours access.
• Track dashboard ownership transitions and generate alerts when ownership changes without an approved change request.

How to Mitigate CVE-2026-33377

Immediate Actions Required

• Upgrade Grafana to the fixed version specified in the Grafana Security Advisory CVE-2026-33377.
• Audit existing dashboards for unauthorized permission changes performed by Editor-role users.
• Review and tighten dashboard write permissions, granting them only to users who require modification rights.

Patch Information

Grafana has published a security advisory and corresponding patched releases for CVE-2026-33377. Administrators should consult the Grafana Security Advisory CVE-2026-33377 for the exact fixed version numbers and apply the upgrade through their standard Grafana update process.

Workarounds

• Restrict dashboard write permissions to dashboard owners only, removing broad Editor write access where feasible.
• Use folder-level permission inheritance to enforce ownership boundaries and limit cross-team dashboard modifications.
• Implement change-control review for dashboard permission modifications until the patched version is deployed.