EUVD-2026-87255Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/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 network endpoint leaks the login code with no user interaction (PR:N/UI:N/AC:L); full account takeover yields C:H and I:H, with no availability impact (A:N) and unchanged scope.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
X-SpringBoot through 6.0 returns login verification codes in HTTP responses from unauthenticated endpoints GET /sys/mobile/code and GET /sys/email/code without sending them to account owners. Attackers can request codes using known mobile numbers or email addresses, read them from responses, and authenticate as victims via POST /sys/emailOrMobileLogin/login to hijack accounts.
Articles & Coverage 1
AnalysisAI
X-SpringBoot through 6.0 allows remote unauthenticated attackers to hijack user accounts by abusing unauthenticated endpoints that return login verification codes in HTTP responses, enabling authentication as any victim whose mobile number or email is known. Publicly available exploit code exists, and the vulnerability is not confirmed actively exploited (not in CISA KEV). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions - remote unauthenticated exploitation against default configurations of X-SpringBoot through 6.0, because the code-issuing endpoints GET /sys/mobile/code and GET /sys/email/code require no authentication and return the verification code in the response by design. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue, not an inflated CVSS score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch is identified in the available data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every deployment of X-SpringBoot from version 0 through 6.0 and isolate or disable internet-facing login and verification-code endpoints, placing them behind VPN, allowlisted source IPs, or a WAF rule that blocks responses containing verification-code fields; simultaneously rotate credentials and invalidate active sessions for any accounts whose phone number or email may have touched the affected flow. …
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External POC / Exploit Code
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