EUVD-2026-40155
GHSA-c3qp-4qxm-fwhr
Severity by source
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/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
Remote authenticated domain admin (PR:L) sends a single simple API request with an enumerable pk, so AC:L; password reset yields full account takeover, hence C:H/I:H/A:H.
Primary rating from Vendor (vulncheck).
CVSS VectorVendor: vulncheck
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/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
Lifecycle Timeline
2DescriptionCVE.org
Modoboa before 2.9.0 contains an insecure direct object reference vulnerability in the PUT /api/v1/accounts/{pk}/password/ endpoint that allows domain administrators to change any user's password. Attackers with domain admin privileges can bypass object-level access controls to reset superadmin passwords and achieve full account takeover.
AnalysisAI
{pk}/password/ endpoint, which fails to enforce object-level authorization (CWE-639 IDOR). By simply supplying another user's primary key, a domain-scoped admin can take over the highest-privileged account and gain full control of the mail platform. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated account holding the domain administrator role in Modoboa (PR:L in the CVSS vector confirms low-but-present privileges) and network reach to the management API. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The supplied CVSS 4.0 base score is 7.7 (High) with vector AV:N/AC:H/AT:N/PR:L/UI:N and high confidentiality, integrity, and availability impact (VC:H/VI:H/VA:H), no scope/subsequent-system impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A hosting reseller or per-customer domain administrator, who is legitimately granted control over only their own domain in a shared Modoboa instance, enumerates or guesses the integer account ID (pk) of the instance superadmin. They send a single authenticated PUT request to /api/v1/accounts/{superadmin_pk}/password/ with a new password, which the server applies without checking domain ownership, granting them superadmin login and full platform takeover. … |
| Remediation | Upgrade to Modoboa 2.9.0 or later, which contains the object-level authorization fix (upstream fix available via PR #4038 and commit a1878c4920a6e47c3217c6ff1ed4a8753c202661; released patched version is the 2.9.0 series per the 'before 2.9.0' affected range). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Verify deployment of the mail platform in your environment; if deployed, immediately restrict access to the password endpoint via network or application controls and review access logs for exploitation attempts. …
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Same technique Authentication Bypass
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External POC / Exploit Code
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