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Fencer Intel
high 8.1

CVE-2018-7711 json

SimpleSAMLphp saml2 incorrect signature validation

published 8y ago modified 4mo ago also GHSA-g888-g2pp-82hf , EUVD-2022-3924

cvss
8.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

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.

Patch / fix

  • packagist simplesamlphp/saml2 1.10.6, 2.3.8, 3.1.4
  • simplesamlphp simplesamlphp 1.15.4
  • simplesamlphp saml2 1.10.6, 2.3.8, 3.1.4
  • simplesamlphp Debian 14, Debian 12 1.15.4-1

debian advisories DEBIAN-CVE-2018-7711

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-7711 updated cvss 5.6

php-simplesamlphp-saml2: Authentication Bypass in the signature validation utilities

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.19% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 8.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub 3.0 8.1 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist simplesamlphp/saml2
<1.10.6
>=2.0, <2.3.8
>=3.0, <3.1.4
1.10.6
2.3.8
3.1.4

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.