Improper Verification of Cryptographic Signature in gosaml2 - CVE-2020-15216
Published: September 29, 2020 / Updated: April 28, 2026
Vulnerability identifier: #VU128388
CSH Severity: High
CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-15216
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass authentication.
The vulnerability exists due to improper signature verification in SAML response validation when processing a valid signed SAML response. A remote attacker can modify the document to bypass authentication.
An expired signed SAML response may be sufficient for exploitation.
Affected software
gosaml2
Fedora
golang-github-russellhaering-goxmldsig
Fedora
golang-github-russellhaering-goxmldsig
How to mitigate CVE-2020-15216
Install security update from vendor's website.
gosaml2 - update to 0.5.0
golang-github-russellhaering-goxmldsig - addressed in versions 1.1.0-1.fc32, 1.1.0-1.fc33
golang-github-russellhaering-goxmldsig - addressed in versions 1.1.0-1.fc32, 1.1.0-1.fc33