Session takeover via Auth Proxy cache key collision
Published Sep 2, 2026 · Updated Sep 3, 2026
Authentication bypass in self-managed Grafana OSS and Enterprise allows remote authenticated users to impersonate higher-privileged users. The Auth Proxy identity cache concatenates usernames and forwarded attributes without delimiters, allowing distinct identities to produce the same cache key. Exploitation requires identity caching with sync_ttl above zero, attacker-controlled attributes, and a live higher-privileged entry; a collision grants that user's access, up to Administrator.
Summary
What happened
Authentication bypass in self-managed Grafana OSS and Enterprise allows remote authenticated users to impersonate higher-privileged users. The Auth Proxy identity cache concatenates usernames and forwarded attributes without delimiters, allowing distinct identities to produce the same cache key. Exploitation requires identity caching with sync_ttl above zero, attacker-controlled attributes, and a live higher-privileged entry; a collision grants that user's access, up to Administrator.
The record
- CVE
- CVE-2026-14199
- Published
- Sep 2, 2026
- Updated
- Sep 3, 2026
- Vendor
- Grafana Labs
- Product
- Grafana OSS
- Classifications
- CWE-863, CWE-290, CWE-1023
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 2, 2026CVE publishedPublication date reported by the CVE source.
- Sep 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=11.0.0 <=11.6.17
- Affected versionversion=12.0.0 <=12.2.11
- Affected versionversion=12.3.0 <=12.3.11
- Affected versionversion=12.4.0 <=12.4.9
- Affected versionversion=13.0.0 <=13.0.7
- Affected versionversion=13.1.0 <=13.1.4
- Affected versionversion=13.2.0 <=13.2.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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