Grafana: Three Moderate Vulnerabilities Including Stored XSS and DoS Disclosed Together
Three moderate vulnerabilities, including stored XSS and two DoS flaws, were disclosed in Grafana on July 10, 2026, impacting data integrity and service availability.
Key findings
- Three moderate-severity vulnerabilities disclosed in Grafana on July 10, 2026.
- Stored XSS vulnerability (CVE-2026-8595) via malicious dashboard field names.
- Two denial-of-service vulnerabilities (CVE-2026-8609, CVE-2026-33382) related to memory exhaustion.
- Vulnerabilities impact data integrity and service availability.
- Users are urged to update Grafana to patched versions.
On July 10, 2026, three moderate-severity vulnerabilities were disclosed in Grafana, a popular open-source platform for data visualization and monitoring. The vulnerabilities, all published on the same day, include a stored cross-site scripting (XSS) flaw and two distinct denial-of-service (DoS) vulnerabilities. These disclosures highlight potential risks for Grafana users, particularly concerning data integrity and service availability.
One of the disclosed vulnerabilities, CVE-2026-8595, is a stored XSS vulnerability. This flaw allows an attacker to inject malicious scripts into Grafana dashboards through a crafted dashboard field name. Once embedded, these scripts can execute in the browsers of other users who view the compromised dashboard, potentially leading to session hijacking, data theft, or unauthorized actions.
The remaining two vulnerabilities, CVE-2026-8609 and CVE-2026-33382, both relate to denial-of-service conditions. CVE-2026-8609 specifically targets the OAuth login route, where an attacker can trigger unbounded memory growth, leading to a DoS state. Similarly, CVE-2026-33382 addresses DoS risks arising from excessively large API request payloads, which can cause the Grafana instance to consume all available memory.
These vulnerabilities were disclosed by Grafana Labs' security team. While the provided information does not specify active exploitation in the wild or name specific threat actors, the nature of these flaws warrants prompt attention from administrators. The stored XSS vulnerability poses a risk to user trust and data security, while the DoS vulnerabilities could disrupt critical monitoring and data visualization services.
Grafana Labs has addressed these vulnerabilities in subsequent releases. Users are strongly advised to update their Grafana instances to the latest patched versions to mitigate these risks. Specific version information for the patches can be found in the official Grafana security advisories.
The coordinated disclosure of these three vulnerabilities underscores the importance of maintaining up-to-date Grafana deployments. Administrators should review their configurations and ensure all instances are patched to prevent potential security breaches and service disruptions. Staying informed about security advisories from Grafana Labs is crucial for safeguarding Grafana environments.