CVE-2026-88896 (GCVE-0-2026-88896)

Vulnerability from cvelistv5 – Published: 2026-09-10 13:05 – Updated: 2026-09-15 14:29
VLAI
Title
EspoCRM before 10.0.4 SSRF via IPv6 Transition Address Bypass
Summary
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.
Severity
6.9 (Medium)
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
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 14:29 UTC
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7815 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
espocrm espocrm Affected: 0 , < 10.0.4 (semver)
Unaffected: 10.0.4 (semver)
    cpe:2.3:a:espocrm:espocrm:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-13 00:00
Show details on NVD website
To clipboard 

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