CVE-2026-88896

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Source
https://cve.org/CVERecord?id=CVE-2026-88896
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88896.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-88896
Aliases
  • GHSA-xwmh-j8hf-cfqw
Published
2026-09-10T13:05:43Z
Modified
2026-09-12T03:47:22Z
Severity
  • 6.9 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
EspoCRM before 10.0.4 SSRF via IPv6 Transition Address Bypass
Details

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.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88896.json"
}
References

Affected packages

Git / github.com/espocrm/espocrm

Affected ranges

Type
GIT
Repo
https://github.com/espocrm/espocrm
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
0a50f3a37c8e2d96c0746a07ff698c9ef1c0c3aa
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "10.0.4"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ]
}

Affected versions

1.*
1.0.0
1.0.1
1.1.0
1.1.1
1.1.2
1.2.0
10.*
10.0.0
10.0.1
10.0.2
10.0.3
2.*
2.0.1
2.3.0
2.4.0
2.5.0
2.5.1
2.5.2
2.6.0
2.8.0
2.8.1
2.9.0
3.*
3.0.0
3.1.0
3.2.0
3.3.0
3.4.0
3.4.1
3.4.2
3.5.0
3.6.0
3.6.1
3.7.0
3.7.1
3.8.0
3.9.0
3.9.1
4.*
4.0.0
4.0.0-beta.1
4.0.0-beta.2
4.0.0-beta.3
4.0.0-beta.4
4.0.1
4.0.2
4.0.3
4.1.0
4.1.1
4.1.2
4.1.3
4.1.4
4.2.0
4.2.1
4.2.2
4.2.3
4.2.4
4.3.0
4.3.0-beta.1
4.3.0-beta.2
4.4.0
4.5.0
4.6.0
4.7.0
4.8.0
5.*
5.0.0
5.0.1
5.1.0
5.1.1
5.1.2
5.2.0
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.3.0
5.3.1
5.3.2
5.4.0
5.4.1
5.4.2
5.4.3
5.5.0
5.5.1
5.6.0
5.6.1
5.7.0
5.7.1
5.7.2
5.7.3
5.7.4
5.7.5
5.8.0
5.8.1
5.8.2
5.9.0
5.9.1
5.9.2
6.*
6.0.0
6.0.0-beta1
6.0.0-beta2
6.0.0-beta4
6.0.1
7.*
7.0.0
7.0.1
7.0.2
7.0.3
7.0.4
7.0.5
7.0.6
7.0.7
7.0.8
7.1.0
7.1.1
7.1.2
7.1.3
7.2.0
7.3.0
7.4.0
7.4.1
7.4.2
7.4.3
8.*
8.0.0
8.0.1
8.0.2
8.1.0
8.2.0
8.4.0
9.*
9.0.0
9.0.1
9.0.2
9.1.0
9.2.0
9.3.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88896.json"