EUVD-2026-59944
GHSA-6x44-jq26-vpv6
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/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 unauthenticated SSRF with low confidentiality disclosure; no integrity or availability impact; no scope change since loopback services remain on the same host boundary.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/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
Lifecycle Timeline
2DescriptionCVE.org
stoatchat versions before 0.15.0 fail to block the IPv6 unspecified address (::) in the SSRF blocklist, allowing unauthenticated attackers to bypass protections via the /proxy and /embed endpoints. Attackers can craft requests using IPv6 literal syntax to access services on the loopback interface and retrieve sensitive internal content.
AnalysisAI
SSRF protection bypass in stoatchat before 0.15.0 exposes loopback-bound services to unauthenticated remote attackers through incomplete IPv6 address filtering on the /proxy and /embed endpoints. The application's blocklist omits the IPv6 unspecified address (::), which can resolve to or function as the loopback interface, enabling crafted requests using IPv6 literal URL syntax to reach internal services not intended to be externally accessible. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The /proxy and /embed endpoints must be network-accessible to the attacker - these are the specific application features through which SSRF is triggered. … 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:N) confirms unauthenticated, low-complexity network exploitation with no prerequisites beyond a reachable /proxy or /embed endpoint, representing a high base accessibility even at a moderate 6.9 score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker sends an HTTP GET request to the target stoatchat instance targeting /proxy or /embed with a destination URL containing the IPv6 unspecified address in bracket notation, such as http://[::]:8080/admin. Because :: is not in the SSRF blocklist, stoatchat forwards the request to the local loopback interface on port 8080, and the internal service response is returned to the attacker. … |
| Remediation | Upgrade stoatchat to version 0.15.0 or later, which corrects the SSRF blocklist to include the IPv6 unspecified address (::). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-918 – Server-Side Request Forgery (SSRF)
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External POC / Exploit Code
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