Signal is active with 2 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below have an authenticated Server-Side Request Forgery (SSRF) vulnerability that allows bypassing the internal-host validation logic by using alternative IPv4 representations such as octal notation (e.g., 0177.0.0.1 instead of 127.0.0.1). This is caused by HostCheck::isNotInternalHost() function relying on PHP's filter_var(..., FILTER_VALIDATE_IP), which does not recognize alternative IP formats, causing the validation to fall through to a DNS lookup that returns no records and incorrectly treats the host as safe, however the cURL subsequently normalizes the address and connects to the loopback destination. Through the confirmed /api/v1/Attachment/fromImageUrl endpoint, an authenticated user can force the server to make requests to loopback-only services and store the fetched response as an attachment. This vulnerability is distinct from CVE-2023-46736 (which involved redirect-based SSRF) and may allow access to internal resources reachable from the application runtime. This issue has been fixed in version 9.3.4.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
CVE-2026-33534 EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below have an authenticated Server-Side Request Forgery (SSRF) vulnerabilit… https://www.cve.org/CVERecord?id=CVE-2026-33534
Post summary
EspoCRM versions 9.3.3 and below are vulnerable to an authenticated Server‑Side Request Forgery (SSRF), as disclosed in CVE‑2026‑33534.
CVE-2026-33534 Authenticated Server-Side Request Forgery in EspoCRM 9.3.3 via Alternative IPv4 Representations https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-33534
Post summary
The post announces an authenticated Server‑Side Request Forgery vulnerability in EspoCRM 9.3.3 through alternative IPv4 representations, but provides no PoC, exploit, or remedial guidance.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | espocrm | espocrm | - | - | - |