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Kubernetes CVE-2026-28809

| EUVDEUVD-2026-14396 MEDIUM
Improper Restriction of XML External Entity Reference (CWE-611)
2026-03-23 EEF GHSA-4g2h-vm7x-747c
6.3
CVSS 4.0 · Vendor: EEF
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Severity by source

Vendor (EEF) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from Vendor (EEF) · only source for this CVE.

CVSS VectorVendor: EEF

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
EUVD ID Assigned
Mar 23, 2026 - 10:45 euvd
EUVD-2026-14396
Analysis Generated
Mar 23, 2026 - 10:45 vuln.today
CVE Published
Mar 23, 2026 - 10:09 nvd
MEDIUM 6.3

DescriptionCVE.org

XML External Entity (XXE) vulnerability in esaml (and its forks) allows an attacker to cause the system to read local files and incorporate their contents into processed SAML documents, and potentially perform SSRF via crafted SAML messages.

esaml parses attacker-controlled SAML messages using xmerl_scan:string/2 before signature verification without disabling XML entity expansion. On Erlang/OTP versions before 27, Xmerl allows entities by default, enabling pre-signature XXE attacks. An attacker can cause the host to read local files (e.g., Kubernetes-mounted secrets) into the SAML document. If the attacker is not a trusted SAML SP, signature verification will fail and the document is discarded, but file contents may still be exposed through logs or error messages.

This issue affects all versions of esaml, including forks by arekinath, handnot2, and dropbox. Users running on Erlang/OTP 27 or later are not affected due to Xmerl defaulting to entities disabled.

AnalysisAI

A SSRF vulnerability (CVSS 6.3) that allows an attacker. Remediation should follow standard vulnerability management procedures.

Technical ContextAI

CWE-611 (XML External Entity).

RemediationAI

Monitor vendor channels for patch availability.

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CVE-2026-28809 vulnerability details – vuln.today

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