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CVE-2018-20857

24
FAUCET Score

CVE-2018-20857 affects Zendesk Samlr versions prior to 2.6.2, allowing an XML nodes comment attack where an attacker can manipulate the name_id node to include arbitrary data after a legitimate user's email, followed by their own domain. This vulnerability has a CVSS score of 7.5 (High), indicating a network-based attack with low complexity that can lead to high integrity impact, though confidentiality and availability are not affected. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.6.2CPE matchmatch criteria
cpe:2.3:a:zendesk:samlr:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.21%
Probability of exploitation in next 30 days
EPSS Percentile
65.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0120 is in the 44th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
rubygemspatch availablevia ghsa
Product: samlrFixed in: 2.6.2

Vendor Advisories (1)

rubygemsGHSA-qpxp-5j56-gg3xhigh

samlr XML nodes comment attack

Jul 31, 2019

References

github.com / zendesk/samlr/compare/v2.6.1...v2.6.2
PatchThird Party Advisory