CVE-2018-7340 json
Multiple SAML libraries may allow authentication bypass via incorrect XML canonicalization and DOM traversal
published 2019-04-17 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-19072
- cvss
- 7.7
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
Duo Network Gateway 1.2.9 and earlier may incorrectly utilize the results of XML DOM traversal and canonicalization APIs in such a way that an attacker may be able to manipulate the SAML data without invalidating the cryptographic signature, allowing the attack to potentially bypass authentication to SAML service providers.
Patch / fix
- Duo Security Duo Network Gateway 1.2.9
Exploit prediction
0.94% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- duo.com https://duo.com/blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementations referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 7.7 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
Affected products
- Duo Security Duo Network Gateway
Classification
References
-
duo.com
/blog/duo-finds-saml-vulnerabilities-affecting-multiple-implementations
exploit, vendor-advisory
-
kb.cert.org
/vuls/id/475445
third-party-advisory, us-government-resource
Sources
- CVE List CVE-2018-7340
- NVD CVE-2018-7340
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