EUVD-2026-80858
GHSA-9f7f-38p2-62c4
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/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
Network-reachable endpoints exploitable by any low-privileged authenticated user (PR:L) with no interaction; full user-PII disclosure gives C:H, with no integrity or availability impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Guns through 8.3.5 contains an information disclosure vulnerability in SysUserController where /sysUser/detail and /sysUser/page endpoints omit requiredPermission configuration, causing the permission interceptor to skip RBAC validation for authenticated users. Attackers with any valid login token can retrieve sensitive user information including account names, real names, email addresses, phone numbers, last login IPs, and role assignments for all users in the system.
AnalysisAI
Missing authorization in the Guns Java rapid-development framework (through 8.3.5) allows any authenticated user to harvest the full user directory, including account names, real names, email addresses, phone numbers, last-login IPs and role assignments. The /sysUser/detail and /sysUser/page handlers in SysUserController omit the requiredPermission annotation, so the TokenAndPermissionInterceptor performs no RBAC check on them and returns data for every user in the system to anyone holding a valid login token. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the attacker to hold ANY valid Guns login token (PR:L authenticated session) - the flaw does not permit unauthenticated access. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H) scoring 7.1 is internally consistent with the description: a network-reachable flaw requiring only a low-privileged authenticated session (any valid login token) to read all users' PII with no user interaction. … 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: the available references point to the upstream source repository, the specific interceptor source lines, the affected Maven artifact, and tracking issue https://github.com/stylefeng/Guns/issues/118 rather than to a tagged fixed release, so no patched version number can be cited and upgrades should be validated against the upstream issue before being treated as a fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every externally reachable and internal deployment of the Guns framework at version 8.3.5 or earlier and confirm which expose /sysUser/detail and /sysUser/page; immediately block or restrict those two paths at the reverse proxy, API gateway or WAF, allowing access only from trusted administrative networks or privileged roles, and search web/application logs for calls to those endpoints originating from low-privileged accounts to determine whether enumeration has already occurred. …
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Same weakness CWE-862 – Missing Authorization
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External POC / Exploit Code
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