EUVD-2026-63743Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Network-reachable with no authentication; integrity-only impact from stripping token IP restrictions; no confidentiality or availability consequence.
Primary rating from Vendor (github).
CVSS VectorVendor: github
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
3DescriptionCVE.org
Mailu is a mail server as a set of Docker images. Prior to version 2024.06.52, a missing authorization check in the Mailu admin REST API allows any unauthenticated attacker to remove any potential IP restriction or update the comment field from any existing user token provided the REST API is enabled. Upgrade to Mailu 2024.06.52 to receive a patch or, as a workaround, turn the REST API off.
Articles & Coverage 1
AnalysisAI
Missing authorization in the Mailu admin REST API allows unauthenticated remote attackers to strip IP-based access restrictions from any existing user token or alter its comment field, effectively neutralizing a key access-control layer on API tokens. All Mailu deployments running versions prior to 2024.06.52 with the admin REST API explicitly enabled are affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Mailu admin REST API must be explicitly enabled in the Mailu configuration - it is not the default state, so default Mailu installations are not affected. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N, score 7.5) accurately characterizes the attack profile: network-reachable, zero authentication, trivial complexity, and high integrity impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with network access to a Mailu instance where the REST API is enabled sends an unauthenticated HTTP request to the token modification endpoint, targeting a user token by its identifier. The attacker removes the IP allowlist restriction from that token; the server completes the action without requiring credentials. … |
| Remediation | Upgrade to Mailu 2024.06.52 by pulling the updated Docker image tag and redeploying - this is the definitive fix confirmed by the vendor advisory at https://github.com/Mailu/Mailu/security/advisories/GHSA-2w8v-6xr5-g9gh. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, verify whether your Mailu deployment has the admin REST API enabled and identify all instances running versions prior to 2024.06.52; if disabled, document the configuration but continue monitoring. …
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