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CVE-2026-23518Fleet has a JWT signature bypass vulnerability in Azure AD MDM enrollment

Description

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 fix the issue. If an immediate upgrade is not possible, affected Fleet users should temporarily disable Windows MDM.

Timeline

  1. ID reserved

    By GitHub_M

  2. · 8 days later

    Published

  3. · 1 day later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-23518, by who scored it
Scored byCVSSScoreVector
GitHub_MCNA (assigner)4.0Critical9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
NVDNVD · Analyzed4.0Critical9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (exploitation in 30 days)
0.25% · top 83% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.3.

Affected products

  • fleetdm · fleet

    • affected >= 4.78.0, < 4.78.3
    • affected >= 4.77.0, < 4.77.1
    • affected >= 4.76.0, < 4.76.2
    • affected >= 4.75.0, < 4.75.2
    • affected < 4.53.3

Affected packages

From reviewed advisories of the GitHub Advisory Database.

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-23518 badge
[![CVE-2026-23518](https://cveledger.app/badge/CVE-2026-23518.svg)](https://cveledger.app/cve/CVE-2026-23518)

Record last updated .