CVE-2026-46490: samlify: XML Injection in AttributeValue Allows Privilege Escalation in Signed SAML Assertions

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-06-08 · updated 2026-07-23
Weakness: CWE-91

Description

samlify is a Node.js library for SAML single sign-on. Prior to version 2.13.0, samlify’s template substitution only escapes attribute contexts. Values inserted into element text (e.g., <saml:AttributeValue>) are not escaped. A normal user can inject XML markup into an attribute value (e.g., email, name) and add new <saml:Attribute> elements inside the signed assertion. The IdP then signs the tampered assertion and the SP accepts the injected attributes as trusted. This allows privilege escalation when attributes are used for authorization (roles/groups). This issue has been patched in version 2.13.0.

Affected products

tngan samlify: before 2.13.0 — fixed in 2.13.0

How to fix

Upgrade to a fixed version: tngan samlify 2.13.0. Check the vendor advisory for mitigations.

References

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