CVE-2026-21722
📋 TL;DR
This vulnerability in Grafana allows attackers to view annotation data outside the locked timerange on public dashboards with annotations enabled. Organizations using Grafana with public dashboards and annotation features are affected. The vulnerability exposes historical annotation data that should be restricted by dashboard time settings.
💻 Affected Systems
- Grafana
📦 What is this software?
Grafana by Grafana
Grafana by Grafana
Grafana by Grafana
Grafana by Grafana
Grafana by Grafana
Grafana by Grafana
Grafana by Grafana
Grafana by Grafana
⚠️ Risk & Real-World Impact
Worst Case
Sensitive historical annotation data containing confidential information, timestamps, or operational details could be exposed to unauthorized users accessing public dashboards.
Likely Case
Unauthorized users can view annotation history beyond the intended time window, potentially revealing historical operational data, comments, or timeline information that should be restricted.
If Mitigated
With proper access controls and dashboard configuration, only non-sensitive annotation data within intended time ranges would be accessible.
🎯 Exploit Status
Exploitation requires access to a public dashboard URL with annotations enabled; no authentication or special tools needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Grafana security advisory for specific patched versions
Vendor Advisory: https://grafana.com/security/security-advisories/CVE-2026-21722
Restart Required: Yes
Instructions:
1. Review Grafana security advisory for affected versions. 2. Upgrade to patched version. 3. Restart Grafana service. 4. Verify public dashboards function correctly.
🔧 Temporary Workarounds
Disable annotations on public dashboards
allRemove annotation functionality from all public dashboards
Navigate to dashboard settings > Annotations > Disable annotations
Make dashboards private
allConvert public dashboards to require authentication
Navigate to dashboard settings > General > Make dashboard private
🧯 If You Can't Patch
- Disable annotations on all public dashboards immediately
- Review and remove any sensitive information from existing annotations
🔍 How to Verify
Check if Vulnerable:
Check if you have public dashboards with annotations enabled and test if annotation data outside locked timerange is accessibleCheck Version:
grafana-server -vVerify Fix Applied:
After patching, verify that annotations on public dashboards respect the locked timerange and historical data outside that range is inaccessible📡 Detection & Monitoring
Log Indicators:
- Unusual annotation queries on public dashboards
- Multiple requests for annotation data with varying time parameters
Network Indicators:
- HTTP requests to annotation endpoints on public dashboard URLs with manipulated time parameters
SIEM Query:
source="grafana" AND (uri_path="/api/annotations" OR uri_path="*annotation*") AND http_method=GET AND NOT user_agent="internal"