EUVD-2026-78363
GHSA-6c99-87fr-6q7r
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/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
WebAuthn flow is network-reachable (AV:N) but exploitation needs a non-default config plus a prior write primitive into a controlled attribute, so AC:H and PR:L; deserialization yields full code execution (C/I/A:H).
Primary rating from Vendor (https://github.com/OpenIdentityPlatform/OpenAM).
CVSS VectorVendor: https://github.com/OpenIdentityPlatform/OpenAM
Lifecycle Timeline
5DescriptionCVE.org
Summary
Description
A deserialization of untrusted data vulnerability (CWE-502) exists in OpenAM's WebAuthn authentication module. Under certain conditions, this may allow an attacker to achieve arbitrary code execution in the context of the application server. This affects OpenAM Community Edition through version 16.0.6 and was patched in version 16.1.1.
This is not the default configuration. Exploitation requires that an attacker has previously been able to write attacker-controlled data to a storage attribute read by the WebAuthn module, and that the WebAuthn authentication flow is reachable.
Impact
WebAuthn is a modern shipped module, but the vulnerable configuration requires either the default storage attribute to become attacker-writable, or the WebAuthn userAttribute to be set to an attacker-writable string attribute. That is not the default, but it is feasible in deployments because the product exposes the storage attribute as a free-form admin setting and does not warn or enforce that it must be server-managed and non-user-writable. This may exist through delegated administration, provisioning, write access to the backing LDAP/directory user record, legacy REST self-registration, or unsafe reconfiguration of userAttribute.
In any deployment where the attribute becomes user writable, an attacker can execute arbitrary code as the application server user.
Patch
This has been patched in OpenAM Community Edition version 16.1.1. Users are encouraged to update to the latest release.
AnalysisAI
We need answer as JSON object per required fields. Need synthesize all data. Need ensure plain strings, no arrays except data_quality_flags as array of objects. But instructions say every field plain text string NOT array/object — except data_quality_flags explicitly JSON array. Need return valid JSON.
Need parse CVE. product_name: OpenAM. Probably "OpenAM". summary original synthesis. technical_context. risk_assessment. affected_products. remediation. exploit_scenario. exploitation_conditions. attack_chain. confidence_notes. data_quality_flags. prevalence. prevalence_basis. assessed_cvss_vector. assessed_cvss_rationale. assessed_cvss40_vector.
Need use all data. Let's inspect.
CVE-2026-45051: Deserialization of untrusted data in OpenAM WebAuthn authentication module. Affected OpenAM Community Edition through 16.0.6, patched 16.1.1. Not default config. Requires attacker previously able to write attacker-controlled data to storage attribute read by WebAuthn module, and WebAuthn authentication flow reachable. Impact arbitrary code execution as application server user. CVSS 4.0 vector provided: AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X etc. They provided CVSS score 9.2 likely from CVSS 4. EPSS 0.69 percentile 51. Patch available. Reported by GitHub OpenIdentityPlatform. CPE pkg:maven/org.openidentityplatform.openam:openam-auth-webauthn. Tags RCE, Deserialization. ENISA EUVD. References commit, release, advisory. Diff shows patch using ObjectInputFilter allowlist.
Need not copy description. Summarize.
Need assess CVSS ourselves. Provided CVSS 4: AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Need map to CVSS 3.1: AV:N? AC:L? PR:N? UI:N? S:C? C:H/I:H/A:H? Wait vulnerability requires attacker previously writes data to storage attribute. That might be precondition, not directly part of exploit? The CVSS 4 uses AT:P (attack requirements: present). PR:N. So no auth to trigger? But to write attacker-controlled data, attacker likely needs some ac
Same weakness CWE-502 – Deserialization of Untrusted Data
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External POC / Exploit Code
Leaving vuln.today