7.5

CVE-2018-20857: zendesk samlr Improper Input Validation

CVSS: 7.5v3.0HighModified
AliasesGHSA-qpxp-5j56-gg3x
Published 26-07-2019Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2018-20857 is a high (CVSS 7.5) Improper Input Validation vulnerability in zendesk samlr. EPSS estimates a 1.21% chance of exploitation in the next 30 days, higher than 68% 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
1.21%
0%100%
Low · +0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 26-07-2019
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

Zendesk Samlr before 2.6.2 allows an XML nodes comment attack such as a name_id node with user@example.com followed by <!---->. and then the attacker's domain name.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.21%

Chance of exploitation in the next 30 days

Percentile

68%

Versus all other CVEs

30-day change

+0.03 pp

From 1.18% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.21%

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

RubyGems1 product
  • samlr< 2.6.2
Zendesk1 product

2 vendors · 2 products

References

5 links