Vulnerability · Published Jun 8, 2026 · Assigned by GitHub_M
CVE-2026-46490samlify: XML Injection in AttributeValue Allows Privilege Escalation in Signed SAML Assertions
High 8.7
In plain English
A high-severity security flaw in samlify from tngan. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | samlify | 2.13.0 | GHSA-34r5-q4jw-r36m |
Affected products (as reported)
Weakness: CWE-91 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/tngan/samlify/security/advisories/GHSA-34r5-q4jw-r36m x_refsource_CONFIRM