7.5

CVE-2018-7644: simplesamlphp

CVSS: 7.5v3.0HighModified
AliasesUBUNTU-CVE-2018-7644DEBIAN-CVE-2018-7644
Published 05-03-2018Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2018-7644 is a high (CVSS 7.5) vulnerability in simplesamlphp. EPSS estimates a 1.25% chance of exploitation in the next 30 days, higher than 69.1% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.0 (NVD)
EPSS score
1.25%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2
DLA-1298-1DSA-4127-1

Timeline

  1. 05-03-2018
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.25%

Chance of exploitation in the next 30 days

Percentile

69%

Versus all other CVEs

30-day change

+0.01 pp

From 1.24% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.25%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • simplesamlphp< 1.15.3-1
Simplesamlphp1 product
Ubuntu1 product
  • simplesamlphpAll versions (No fix recorded)

3 vendors · 3 products

References

4 links