CVE-2026-26338
Published: 19 February 2026
Summary
CVE-2026-26338 is a medium-severity SSRF (CWE-918) vulnerability in Hyland Alfresco Transform Core. Its CVSS base score is 6.9 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 27.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 AC-4 (Information Flow Enforcement) and SI-10 (Information Input Validation).
Deeper analysis
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.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-8382
Vulnerability details
Hyland Alfresco Transformation Service allows unauthenticated attackers to achieve server-side request forgery (SSRF) through the document processing functionality.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
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.
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly remediates the SSRF vulnerability by applying Hyland's security update to the Alfresco Transformation Service document processing functionality.
Validates and sanitizes unauthenticated inputs to the document processing endpoint to prevent SSRF payloads from inducing arbitrary server requests.
Enforces flow control policies restricting the service from making unauthorized outbound requests to internal or external resources exploited via SSRF.