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

8.7HIGH

Key Information:

Vendor

Tngan

Status
Samlify
Vendor
CVE Published:
8 June 2026

What is CVE-2026-46490?

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 Version(s)

samlify < 2.13.0

References

https://github.com/tngan/samlify/security/advisories/GHSA...
x_refsource_CONFIRM

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.