EUVD-2026-75446
GHSA-p98c-469w-949w
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L/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
Requires attacker-controlled DNS with IPv6 transition records (AC:H) and authenticated EspoCRM user access (PR:L); scope changes as internal services are reached via forged requests.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
EspoCRM before 10.0.4 is vulnerable to server-side request forgery. HostCheck::ipAddressIsNotInternal(), which validates outbound URLs to block requests to internal/private IP addresses, strips ::ffff: (IPv4-mapped IPv6) prefixes but does not recognize IPv6 transition addresses that embed private IPv4 addresses: NAT64 (64:ff9b::), 6to4 (2002::), and Teredo (2001:0000::). An attacker who controls a domain with AAAA records pointing to such transition addresses can bypass both the internal-host validation and the CURLOPT_RESOLVE IP-pinning check, causing EspoCRM to issue outbound requests to internal network services. Affected paths include POST /Attachment/fromImageUrl, reachable by any authenticated user with attachment access, and outbound webhook delivery, which requires an admin or API user.
AnalysisAI
Server-side request forgery in EspoCRM before 10.0.4 allows authenticated users to route outbound HTTP requests to internal network services by exploiting an incomplete IPv6 blocklist in the host-validation layer. The HostCheck::ipAddressIsNotInternal() function strips ::ffff: IPv4-mapped prefixes but ignores three IPv6 transition address families - NAT64 (64:ff9b::/96), 6to4 (2002::/16), and Teredo (2001:0000::/32) - enabling an attacker who controls a domain with crafted AAAA records to also defeat the CURLOPT_RESOLVE IP-pinning guard and reach private infrastructure. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation of the /Attachment/fromImageUrl path requires a valid EspoCRM authenticated session with attachment access - a common, non-privileged role available to most EspoCRM users. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 6.9 reflects a moderate-severity issue, but the provided vector's PR:N metric directly contradicts the CVE description: both exploitation paths require at minimum an authenticated EspoCRM session, a meaningful real-world barrier that is absent from the official vector. … 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 | Upgrade EspoCRM to version 10.0.4 or later, which patches HostCheck::ipAddressIsNotInternal() to recognize NAT64 (64:ff9b::/96), 6to4 (2002::/16), and Teredo (2001:0000::/32) transition address ranges in addition to the existing ::ffff: stripping logic. … 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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