EUVD-2026-52660
GHSA-jrjq-9cmf-3h6f
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/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
Unauthenticated ActivateSession probing gives PR:N, but the adaptive on-path padding-oracle attack needing a captured token and many requests forces AC:H; password recovery yields C:H and credential reuse yields I:H, with no availability impact.
Primary rating from Vendor (eclipse).
CVSS VectorVendor: eclipse
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/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
3DescriptionCVE.org
In Eclipse Milo versions 0.6.0 through 1.1.4, username-token processing returns distinguishable errors for invalid RSA PKCS#1 v1.5 padding and other authentication failures, allowing an on-path attacker who captures a victim's Basic128Rsa15-encrypted username token to use repeated unauthenticated ActivateSession requests as a padding oracle, recover the victim's password, and authenticate with the recovered credentials.
AnalysisAI
Password recovery in Eclipse Milo (the open-source OPC UA SDK for Java) versions 0.6.0 through 1.1.4 allows an on-path attacker to break username-token confidentiality via a Bleichenbacher-style padding oracle. The server returns distinguishable error responses for invalid RSA PKCS#1 v1.5 padding versus other authentication failures during username-token processing, so an attacker who captures a victim's Basic128Rsa15-encrypted username token can send repeated unauthenticated ActivateSession requests to recover the cleartext password and then authenticate as the victim. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The target Milo server endpoint must offer and use the Basic128Rsa15 security policy, whose RSA PKCS#1 v1.5 padding is the exploitable primitive; endpoints restricted to OAEP-based policies (Basic256Sha256, Aes*_RsaOaep) are not affected via this path. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H) scores 9.1, reflecting an unauthenticated network attacker achieving high confidentiality and integrity impact through credential recovery and reuse. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker positioned on the network path between an OPC UA client and a Milo server (or otherwise able to observe traffic to a Basic128Rsa15 endpoint) captures the victim's RSA-encrypted username token during session activation. The attacker then replays modified versions of the encrypted token in a stream of unauthenticated ActivateSession requests, using the server's differing error responses as a padding oracle to iteratively decrypt the ciphertext and recover the victim's password, then authenticates as the victim. … |
| Remediation | Upstream fix available (PR/commit); released patched version not independently confirmed. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify all systems and applications using Eclipse Milo versions 0.6.0 through 1.1.4 and document their network exposure. …
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External POC / Exploit Code
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