EUVD-2026-63991
GHSA-gwmj-hf32-5v8v
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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
Browser-delivered DNS rebinding gives network reach with only a victim page visit (UI:R) against an unauthenticated local API (PR:N); command execution on the host beyond the vulnerable service justifies S:C with full C/I/A impact.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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
Paperclip before 0.3.1 in default local_trusted mode fails to validate Host headers, allowing attackers to execute arbitrary commands via DNS rebinding. An attacker can craft a malicious webpage that, when visited by a developer running Paperclip locally, uses DNS rebinding to make authenticated API requests and execute commands through the process adapter.
AnalysisAI
Remote code execution in paperclipai's Paperclip before 0.3.1 lets a malicious website hijack a developer's locally running instance through DNS rebinding. Because the default local_trusted mode never validates incoming Host headers, an attacker-controlled webpage can rebind DNS to the local API, issue authenticated requests, and drive the process adapter to run arbitrary commands on the developer's machine. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the victim is actively running a vulnerable Paperclip instance (before 0.3.1) locally in its default local_trusted mode, and that the developer visits an attacker-controlled webpage (UI:P - passive interaction). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H with subsequent-system impact SC:H/SI:H/SA:H) drives the 9.4 score and reflects full compromise of the developer host with only passive user interaction - visiting a webpage. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A developer running Paperclip locally in default mode visits an attacker's webpage, which serves JavaScript that rebinds its domain to 127.0.0.1. The script then sends same-origin requests to Paperclip's local API, invokes the process adapter, and executes attacker-chosen commands on the developer's machine. … |
| Remediation | Upgrade to Paperclip 0.3.1 or later, the fixed release referenced in the vendor advisory GHSA-x8hx-rhr2-9rf7 (https://github.com/paperclipai/paperclip/security/advisories/GHSA-x8hx-rhr2-9rf7); this is the primary and recommended fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all developers using Paperclip locally and immediately restrict local API access to localhost only via firewall rules; consider disabling local_trusted mode as a temporary measure. …
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Paperclip ruby gem version 3.1.4 and later suffers from a Server-SIde Request Forgery (SSRF) vulnerability in the Paperc
The thoughtbot paperclip gem before 4.2.2 for Ruby does not consider the content-type value during media-type validation
Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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