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CVE-2018-7644

24
FAUCET Score

CVE-2018-7644 describes a key confusion vulnerability in the XmlSecLibs library used by SimpleSAMLphp versions prior to 1.15.3. This flaw allows a remote attacker to forge cryptographically valid SAML assertions, enabling user impersonation from an Identity Provider. With a CVSS score of 7.5 (High), it has a low attack complexity and no user interaction required, leading to a high impact on integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion for this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.15.3CPE matchmatch criteria
cpe:2.3:a:simplesamlphp:simplesamlphp:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.26%
Probability of exploitation in next 30 days
EPSS Percentile
66.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0126 is in the 46th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

composerpatch availablevia ghsa
Product: simplesamlphp/saml2Fixed in: 1.10.5
composerpatch availablevia ghsa
Product: simplesamlphp/saml2Fixed in: 2.3.7
composerpatch availablevia ghsa
Product: simplesamlphp/saml2Fixed in: 3.1.3

Vendor Advisories (1)

composerGHSA-923w-2xv2-7pr8high

SimpleSAMLphp Improper Verification of Cryptographic Signature

May 13, 2022

References

simplesamlphp.org / security/201802-01
Vendor Advisory