Low 3.5Published Apr 13, 2026

CVE-2026-33659EspoCRM: SSRF via DNS Rebinding in Attachment fromImageUrl Endpoint Allows Internal Network Access

Updated under an hour ago (Oct 27, 2026, 7:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for espocrm

Exploited in the last 30 days

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 dns_get_record() 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.

CVSS: 3.5 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
Weakness (CWE): CWE-918, CWE-367
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

espocrm espocrm espocrm:espocrm (from the name)	before 9.3.4	CNA record
espocrm espocrm espocrm:espocrm	before 9.3.4	NVD

References

References

https://github.com/espocrm/espocrm/security/advisories/GHSA-6m4j-fwrx-crh7	x-refsource-confirm, exploit, vendor-advisory
https://github.com/espocrm/espocrm/commit/dca03cc3458e487362c26c746378a2d4de9990b1	x-refsource-misc, patch
https://github.com/espocrm/espocrm/releases/tag/9.3.4	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.