CVE Explorer
CVE-2026-23518
Fleet is open source device management software. In versions prior to 4.78.3, 4.77.1, 4.76.2, 4.75.2, and 4.53.3, a vulnerability in Fleet's Windows MDM enrollment flow could allow an attacker to submit forged authentication tokens that are not properly validated. Because JWT signatures were not verified, Fleet could accept attacker-controlled identity claims, enabling enrollment of unauthorized devices under arbitrary Azure AD user identities. Versions 4.78.3, 4.77.1, 4.76.2, 4.75.2, and 4.53.3
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"product":"fleet","vendor":"fleetdm","versions":[{"status":"affected","version":">= 4.78.0, < 4.78.3"},{"status":"affected","version":">= 4.77.0, < 4.77.1"},{"status":"affected","version":">= 4.76.0, < 4.76.2"},{"status":"affected","version":">= 4.75.0, < 4.75.2"},{"status":"affected","version":"< 4.53.3"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:d395c0b971cdedcbd27c2c711553fe31f4eaa86164b0d9bac05247aa607a15ab · sha256:d41f649f2124a584… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.3,"baseSeverity":"CRITICAL","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:d395c0b971cdedcbd27c2c711553fe31f4eaa86164b0d9bac05247aa607a15ab · sha256:d41f649f2124a584… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:d395c0b971cdedcbd27c2c711553fe31f4eaa86164b0d9bac05247aa607a15ab · sha256:d41f649f2124a584… · /containers/cna/problemTypes/0/descriptions/0
Source references
2 source assertions{"name":"https://github.com/fleetdm/fleet/commit/e225ef57912c8f4ac8977e24b5ebe1d9fd875257","tags":["x_refsource_MISC"],"url":"https://github.com/fleetdm/fleet/commit/e225ef57912c8f4ac8977e24b5ebe1d9fd875257"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:d395c0b971cdedcbd27c2c711553fe31f4eaa86164b0d9bac05247aa607a15ab · sha256:d41f649f2124a584… · /containers/cna/references/1
{"name":"https://github.com/fleetdm/fleet/security/advisories/GHSA-63m5-974w-448v","tags":["x_refsource_CONFIRM"],"url":"https://github.com/fleetdm/fleet/security/advisories/GHSA-63m5-974w-448v"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:d395c0b971cdedcbd27c2c711553fe31f4eaa86164b0d9bac05247aa607a15ab · sha256:d41f649f2124a584… · /containers/cna/references/0
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.