Grafana OSS: Improper Authentication
CVE-2026-33377 is a high-severity improper authentication vulnerability in Grafana OSS from Grafana, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists versions 11.6.14+security-04, 12.2.8+security-04, 12.3.6+security-04 as the first without the flaw, so updating Grafana OSS to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.23% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Grafana OSS to 11.6.14+security-04 or 12.2.8+security-04 or 12.3.6+security-04 or 12.4.3+security-02, whichever matches your release line, or a later version.
- Update Grafana to 11.6.14 or 12.2.8 or 12.3.6 or 12.4.3, whichever matches your release line, or a later version.
- Read the advisory on grafana.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Grafana | Grafana OSS | 8.5.0 through 11.6.14; 11.6.14 up to, but not including, 11.6.14+security-04; 12.0.0 through 12.2.8; 12.2.8 up to, but not including, 12.2.8+security-04; 12.3.0 through 12.3.6; 12.3.6 up to, but not including, 12.3.6+security-04; 12.4.0 through 12.4.3; 12.4.3 up to, but not including, 12.4.3+security-02; and 2 more ranges | 11.6.14+security-04, 12.2.8+security-04, 12.3.6+security-04, 12.4.3+security-02, 13.0.1+security-01 |
| Grafana | Grafana | 8.5.0 up to, but not including, 11.6.14; 12.2.0 up to, but not including, 12.2.8; 12.3.0 up to, but not including, 12.3.6; 12.4.0 up to, but not including, 12.4.3; 11.6.14; 12.2.8; 12.3.6; 12.4.3; and 2 more ranges | 11.6.14, 12.2.8, 12.3.6, 12.4.3 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- LowSome restricted data can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N. Scored by CNA (grafana.com).
Official description
An Editor can overwrite a dashboard not owned by them to acquire admin on that specific dashboard. The user must have write access to the dashboard to escalate privilege.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Authentication
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
How developers prevent this class of flaw
- Use an authentication framework or library such as the OWASP ESAPI Authentication feature.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in Grafana OSS
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 7.1 High severity
- 8.5 High severity
- 7.7 High severity
Recent Improper Authentication vulnerabilities
- 9.1 Critical severity
- 9.6 Critical severity
- 7.5 High severity
- 9.1 Critical severity
- 7.6 High severity
- 9.1 Critical severity
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