Cyber Posture

CVE-2026-26338

CriticalPublic PoC

Published: 19 February 2026

Published
19 February 2026
Modified
02 March 2026
KEV Added
—
Patch
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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0011 29.6th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Description

Hyland Alfresco Transformation Service allows unauthenticated attackers to achieve server-side request forgery (SSRF) through the document processing functionality.

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match
prevent

Directly remediates the SSRF vulnerability by applying Hyland's security update to the Alfresco Transformation Service document processing functionality.

SI-10 Information Input Validation good match
prevent

Validates and sanitizes unauthenticated inputs to the document processing endpoint to prevent SSRF payloads from inducing arbitrary server requests.

AC-4 Information Flow Enforcement good match
prevent

Enforces flow control policies restricting the service from making unauthorized outbound requests to internal or external resources exploited via SSRF.

Security SummaryAI

CVE-2026-26338 is a server-side request forgery (SSRF) vulnerability, classified under CWE-918, in the Hyland Alfresco Transformation Service. The flaw resides in the document processing functionality, enabling unauthenticated attackers to exploit it. Published on 2026-02-19, it carries a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H), indicating critical severity due to its network accessibility, low attack complexity, and potential for high impacts across confidentiality, integrity, and availability.

Unauthenticated remote attackers require no privileges or user interaction to exploit this vulnerability. By targeting the document processing endpoint, attackers can induce the service to make arbitrary requests to internal or external resources, facilitating SSRF attacks that may lead to unauthorized data access, service disruption, or further compromise depending on network configuration.

Hyland has issued a security update addressing CVE-2026-26338 alongside CVE-2026-26337 and CVE-2026-26339, available via their connect portal. Additional analysis appears in a Vulncheck advisory focused on the SSRF in the Alfresco Transformation Service. Security practitioners should consult these references for patch availability and mitigation recommendations.

Details

CWE(s)
CWE-918

Affected Products

hyland
alfresco transform service
≤ 4.3
hyland
alfresco transform core
5.3.0 · ≤ 5.3.0

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

CVE-2026-26338 is an unauthenticated SSRF vulnerability in a public-facing document processing endpoint of the Hyland Alfresco Transformation Service, directly enabling exploitation of public-facing applications for initial access.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

References