Viewer role can create, modify and delete Loki alerting rules
Grafana's data source proxy did not apply role-based access control to write requests forwarded to Loki data sources. A user holding only the Viewer role on an affected Grafana instance could send POST, PUT and DELETE requests through the proxy to the Loki rules API (/loki/api/v1/rules), allowing them to create, modify and delete Loki alerting rules. Because those rules are stored by Loki rather than by Grafana, the change took effect for every user of that Loki data source, not only for the Viewer who made the request. Exploitation requires an authenticated Viewer account on the Grafana instance and a configured Loki data source; no other privileges are needed. Both Grafana OSS and Grafana Enterprise are affected. The defect is in Grafana's data source proxy; Loki itself is not vulnerable and does not need to be patched.
CVE-2026-9703
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-9703
Grafana Enterprise
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Grafana OSS
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Grafana",
"product": "Grafana Enterprise",
"versions": [
{
"status": "affected",
"version": "8.0.0",
"versionType": "semver",
"lessThanOrEqual": "11.5.10"
},
{
"status": "affected",
"version": "11.6.0",
"versionType": "semver",
"lessThanOrEqual": "11.6.16"
},
{
"status": "affected",
"version": "12.0.0",
"versionType": "semver",
"lessThanOrEqual": "12.1.10"
},
{
"status": "affected",
"version": "12.2.0",
"versionType": "semver",
"lessThanOrEqual": "12.2.10"
},
{
"status": "affected",
"version": "12.3.0",
"versionType": "semver",
"lessThanOrEqual": "12.3.8"
},
{
"status": "affected",
"version": "12.4.0",
"versionType": "semver",
"lessThanOrEqual": "12.4.5"
},
{
"status": "affected",
"version": "13.0.0",
"versionType": "semver",
"lessThanOrEqual": "13.0.3"
}
],
"defaultStatus": "unaffected"
},
{
"vendor": "Grafana",
"product": "Grafana OSS",
"versions": [
{
"status": "affected",
"version": "12.3.0",
"versionType": "semver",
"lessThanOrEqual": "12.3.8"
},
{
"status": "affected",
"version": "12.4.0",
"versionType": "semver",
"lessThanOrEqual": "12.4.5"
},
{
"status": "affected",
"version": "8.0.0",
"versionType": "semver",
"lessThanOrEqual": "12.3.0"
},
{
"status": "affected",
"version": "13.0.0",
"versionType": "semver",
"lessThanOrEqual": "13.0.3"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-9703
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33119 · Revision 1
- Added to Heist Feed
- Publisher date