CVE-2018-7644
SimpleSAMLphp Improper Verification of Cryptographic Signature
The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.
- Record
CVE-2018-7644- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Weakness
- CWE-347
- Updated
- 2026-11-02
CVE List No score
The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.
- Record
CVE-2018-7644- Updated
- 2026-11-02
EUVDEUVD-2022-3265 No score
The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.
- Record
EUVD-2022-3265- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-923w-2xv2-7pr8
SimpleSAMLphp Improper Verification of Cryptographic Signature
The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.
- Record
GHSA-923w-2xv2-7pr8- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-347
- Updated
- 2026-11-02
OSV
The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.
- Record
CVE-2018-7644- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVDEBIAN-CVE-2018-7644
The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.
- Record
DEBIAN-CVE-2018-7644- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-923w-2xv2-7pr8
SimpleSAMLphp Improper Verification of Cryptographic Signature
The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.
- Record
GHSA-923w-2xv2-7pr8- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-347
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2018-7644
The XmlSecLibs library as used in the saml2 library in SimpleSAMLphp before 1.15.3 incorrectly verifies signatures on SAML assertions, allowing a remote attacker to construct a crafted SAML assertion on behalf of an Identity Provider that would pass as cryptographically valid, thereby allowing them to impersonate a user from that Identity Provider, aka a key confusion issue.
- Record
UBUNTU-CVE-2018-7644- CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
simplesamlphp/saml2Packagist |
before 1.10.5 | 1.10.5 |
simplesamlphp/saml2Packagist |
2.0 up to 2.3.7 | 2.3.7 |
simplesamlphp/saml2Packagist |
3.0 up to 3.1.3 | 3.1.3 |
simplesamlphpDebian:12 |
before 1.15.3-1 | 1.15.3-1 |
simplesamlphpDebian:14 |
before 1.15.3-1, plus listed versions 1.10.0-11.11.0-11.12.0-11.12.0~rc1-11.12.0~rc2-1 Show 37 moreShow less1.13.0-11.13.1-11.13.1-21.13.2-11.14.0-11.14.1-11.14.10-11.14.11-11.14.15-11.14.2-11.14.2-21.14.3-11.14.4-11.14.5-11.14.6-11.14.7-11.14.8-11.14.9-11.15.0-11.15.1-11.15.2-11.6.0-11.6.1-11.6.2-11.6.3-11.6.3-21.6.3-31.7.0-11.7.0-21.8.0-11.8.1-11.8.2-11.9.0-11.9.0~rc1-11.9.0~rc2-11.9.1-11.9.2-1 |
1.15.3-1 |
simplesamlphpDebian:7 |
before 1.9.2-1+deb7u3, plus listed versions 1.9.2-11.9.2-1+deb7u11.9.2-1+deb7u2 |
1.9.2-1+deb7u3 |
simplesamlphpDebian:8 |
before 1.13.1-2+deb8u1, plus listed versions 1.13.1-2 |
1.13.1-2+deb8u1 |
simplesamlphpDebian:9 |
before 1.14.11-1+deb9u1, plus listed versions 1.14.11-1 |
1.14.11-1+deb9u1 |
simplesamlphp/saml2Packagist |
before 1.10.5, plus listed versions v0.1.0v0.1.0-alphav0.3.0v0.4.0v0.4.1 Show 39 moreShow lessv0.4.2v0.5.0v0.6.0v0.6.1v0.6.2v0.6.3v0.6.4v0.7.0v0.7.1v0.8.0v0.8.1v1.0.0v1.1.0v1.10v1.10.1v1.10.2v1.10.3v1.10.4v1.2.0v1.3.0v1.3.1v1.3.2v1.4.0v1.5.0v1.5.1v1.5.2v1.5.3v1.5.4v1.6.0v1.6.1v1.7.0v1.7.1v1.7.2v1.8v1.8.1v1.8.2v1.9v1.9.1v1.9.2 |
1.10.5 |
simplesamlphp/saml2Packagist |
2.0 up to 2.3.7, plus listed versions v2.0.0v2.0.1v2.1v2.2v2.3 Show 6 moreShow lessv2.3.1v2.3.2v2.3.3v2.3.4v2.3.5v2.3.6 |
2.3.7 |
simplesamlphp/saml2Packagist |
3.0 up to 3.1.3, plus listed versions v3.0.0v3.0.1v3.0.2v3.0.3v3.1.0v3.1.1v3.1.2 |
3.1.3 |
simplesamlphpUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 1.13.2-11.14.0-11.14.0-1ubuntu21.14.0-1ubuntu2+esm1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2018-7644 is a high vulnerability (CVSS 7.5) in Simplesamlphp, published March 2, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.45%, the 73rd percentile. Fixed in simplesamlphp/saml2 1.10.5.
References
simplesamlphp.org/security/201802-01
nvd.nist.gov/vuln/detail/CVE-2018-7644
github.com/FriendsOfPHP/security-advisories/blob/master/simplesamlphp/saml2/CVE-2018-7644.yaml
security-tracker.debian.org/tracker/CVE-2018-7644
ubuntu.com/security/CVE-2018-7644
cve.org/CVERecord?id=CVE-2018-7644