CVE-2026-89043 passport-saml-encrypted through 0.1.13 XML Signature Wrapping via Assertion Prepending
Attackers can bypass SAML authentication by prepending forged assertions, allowing unauthorized access to protected resources.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-89043?
CVE-2026-89043 is a critical authentication bypass vulnerability in krakenjs passport-saml-encrypted, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
passport-saml-encrypted through 0.1.13 contains an XML signature wrapping vulnerability where signature verification and assertion extraction use independent XPath lookups with no cross-validation. Attackers holding any validly signed SAML message can prepend a forged unsigned assertion that gets accepted as the verified identity while the genuine signature validates against the original assertion.
Weakness: CWE-347
Which versions are affected by CVE-2026-89043?
How do I fix CVE-2026-89043?
No fix has been published for CVE-2026-89043 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-89043 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-89043 exists.
Sources
Also known as GHSA-8vr8-32m4-xw8q.