EUVD-2026-80859
GHSA-3jcw-728q-x66v
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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
Any authenticated low-privilege user (PR:L) can remotely and reliably tamper system notices (I:H); no data disclosure (C:N) or service disruption (A:N).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
Guns through 8.3.5 contains an improper access control vulnerability in SysNoticeController where requiredPermission defaults to false and is not overridden by any action methods. Authenticated users without assigned roles can exploit this to create, edit, delete, publish and retract system-wide notices affecting arbitrary users and departments.
AnalysisAI
Improper access control in stylefeng Guns through 8.3.5 lets any authenticated user, even one with no assigned roles, create, edit, delete, publish, and retract system-wide notices via SysNoticeController actions that never require a permission. The issue is remotely exploitable with low privileges and high integrity impact but no confidentiality or availability impact; no public exploit code has been identified at time of analysis, and authentication is required (PR:L) because the attacker must already have a valid Guns session.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a valid authenticated Guns session on any version through 8.3.5 - but the account may have NO assigned roles, since the SysNoticeController create/edit/delete/publish/retract actions never set requiredPermission (the interceptor default of false is left in place). … 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:N/VI:H/VA:N) is internally consistent with the description: a remote, low-privileged, authenticated user can trivially exploit a missing authorization check, with impact confined to integrity (VI:H) - no confidentiality or availability loss. … 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 provided data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit logs for any unauthorized SysNoticeController activity and restrict network access to the Guns administrative interface to trusted IP addresses; if feasible, temporarily disable the system notice feature or enforce IP allowlisting for all notice management endpoints. …
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External POC / Exploit Code
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