CVE-2026-33659

Katalog CVE

CVSS 3.1 · Low EPSS 0,40%

Kerentanan Time-of-check Time-of-use (TOCTOU) Race Condition pada espocrm. Skor CVSS 3.1 3.1 (Low) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

13 April 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

3.1 (Low), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-918: Server-Side Request Forgery (SSRF)

EPSS (30 hari)

0,40% peluang dieksploitasi; lebih tinggi dari 32,0% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/espocrm/espocrm/security/advisories/GHSA-6m4j-fwrx-crh7 exploit · advisory vendor
• https://github.com/espocrm/espocrm/commit/dca03cc3458e487362c26c746378a2d4de9990b1 patch
• https://github.com/espocrm/espocrm/releases/tag/9.3.4 release notes