CVE-2018-7711

Name: CVE-2018-7711
Creator: NVD / NIST
Published: 2018-03-05T22:29:00.323+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.22%

Last modified Jun 17, 2026

CVE-2018-7711 is a vulnerability of currently unknown severity. HTTPRedirect.php in the saml2 library in SimpleSAMLphp before 1.15.4 has an incorrect check of return values in the signature validation utilities, allowing an attacker to get invalid signatures accepted as valid by forcing an error during validation. This occurs because of a dependency on PHP functionality that interprets a -1 error code as a true boolean value.. EPSS estimates a 1.22% chance of exploitation in the next 30 days.

Description

HTTPRedirect.php in the saml2 library in SimpleSAMLphp before 1.15.4 has an incorrect check of return values in the signature validation utilities, allowing an attacker to get invalid signatures accepted as valid by forcing an error during validation. This occurs because of a dependency on PHP functionality that interprets a -1 error code as a true boolean value.

Metrics

EPSS Probability

1.22%

64.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Simplesamlphp	Simplesamlphp	< 1.15.4
Simplesamlphp	Saml2	>= 1.0.0, < 1.10.6
Simplesamlphp	Saml2	>= 2.0.0, < 2.3.8
Simplesamlphp	Saml2	>= 3.0.0, < 3.1.4
Debian	Debian Linux	7.0

References

https://github.com/simplesamlphp/saml2/commit/4f6af7f69f29df8555a18b9bb7b646906b45924dPatch
https://lists.debian.org/debian-lts-announce/2018/03/msg00017.htmlThird Party Advisory
https://simplesamlphp.org/security/201803-01Vendor Advisory
https://github.com/simplesamlphp/saml2/commit/4f6af7f69f29df8555a18b9bb7b646906b45924dPatch
https://lists.debian.org/debian-lts-announce/2018/03/msg00017.htmlThird Party Advisory
https://simplesamlphp.org/security/201803-01Vendor Advisory

Timeline

Published: Mar 5, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-7711?

How severe is CVE-2018-7711?

Severity scoring for CVE-2018-7711 is pending analysis. The EPSS model estimates a 1.22% probability of exploitation in the next 30 days.

How do I fix CVE-2018-7711?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-7711?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST