CVE-2026-33659

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-33659
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33659.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33659
Aliases
  • GHSA-6m4j-fwrx-crh7
Published
2026-04-13T20:32:07.072Z
Modified
2026-08-07T11:50:54.376024433Z
Severity
  • 3.5 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N CVSS Calculator
Summary
EspoCRM: SSRF via DNS Rebinding in Attachment fromImageUrl Endpoint Allows Internal Network Access
Details

EspoCRM is an open source customer relationship management application. In versions 9.3.3 and below, the POST /api/v1/Attachment/fromImageUrl endpoint is vulnerable to Server-Side Request Forgery (SSRF) via a DNS rebinding (TOCTOU) condition. Host validation uses dnsgetrecord() but the actual HTTP request resolves hostnames through curl's internal resolver (gethostbyname()), allowing the two lookups to return different IP addresses for the same hostname. A secondary issue exists where an empty DNS result (due to DNS failure, IPv6-only domains, or non-existent hostnames) causes the validation to implicitly allow the host without further checks. An authenticated attacker with default attachment creation access can exploit this gap to bypass internal IP restrictions and scan internal network ports, confirm the existence of internal hosts, and interact with internal HTTP-based services, though data extraction from binary protocol services and remote code execution are not possible through this endpoint. This issue has been fixed in version 9.3.4.

Database specific 
{
    "cwe_ids": [
        "CWE-367",
        "CWE-918"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33659.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
f1763e732f34fbebf7f70f176eec1ccd8a272679
Fixed
dca03cc3458e487362c26c746378a2d4de9990b1
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "9.3.4"
        }
    ],
    "cpe": "cpe:2.3:a:espocrm:espocrm:*:*:*:*:*:*:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

1.*
1.0.0
1.0.1
1.1.0
1.1.1
1.1.2
1.2.0
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
9.3.1
9.3.2
9.3.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33659.json"