EUVD-2026-87256Severity 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 login bypass (PR:N/UI:N/AV:N/AC:L) yields full account takeover so C:H and I:H; no direct availability impact (A:N) and no scope change.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
X-SpringBoot through 6.0 ships with a hardcoded static master login verification code 172839 enabled by default in the database seed. Unauthenticated attackers can authenticate as any user by submitting the public master code to the emailOrMobileLogin endpoint with a known email or mobile number.
Articles & Coverage 1
AnalysisAI
Unauthenticated account takeover in X-SpringBoot through 6.0 allows remote attackers to authenticate as any user by submitting the hardcoded default master login verification code 172839, shipped in the database seed, to the emailOrMobileLogin endpoint together with a known email address or mobile number. Exploitation requires the deployment to retain the default seed and the attacker to know a valid account identifier, but no credentials, OTP, or user interaction are needed; publicly available exploit code exists. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerable target must be an X-SpringBoot instance (through version 6.0) deployed with the default database seed, which enables the static master login verification code 172839; the attacker must know a valid user email address or mobile number registered on the instance and must be able to reach the emailOrMobileLogin endpoint over the network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue, not a paper-tiger high CVSS. … 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 was identified at time of analysis; operators should immediately change or remove the hardcoded master code 172839 from the deployed database and from any seed scripts (the value is referenced in x_springboot.sql line 147 of the GitHub repository). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all X-SpringBoot instances up to version 6.0 and check whether the database seed retains the default master login verification code 172839; if so, immediately remove or change that code and any associated default accounts, and block or monitor the emailOrMobileLogin endpoint. …
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External POC / Exploit Code
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