CVE-2018-20298 — S3 Browser before 8.1.5 contains an XML external entity (XXE) vulnerability, allowing remote attackers to read arbitrary files and obtain NTLMv2 hash values by tricking a user into connecting to a malicious server via the S3 protocol

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MEDIUM

S3 Browser before 8.1.5 contains an XML external entity (XXE) vulnerability, allowing remote attackers to read arbitrary files and obtain NTLMv2 hash values by tricking a user into connecting to a malicious server via the S3 protocol

Published Dec 19, 2018

6.5

MEDIUM

CVSS 3.0

EPSS 1.40%

Description

S3 Browser before 8.1.5 contains an XML external entity (XXE) vulnerability, allowing remote attackers to read arbitrary files and obtain NTLMv2 hash values by tricking a user into connecting to a malicious server via the S3 protocol.

Affected products

Remediation

No remediation recorded yet.

Metrics

1.40% 0.01399

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.01399

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (12 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	1.40% (0.01399)	71.54th	v5 (v2026.06.15)
Sep 20, 2026	1.40% (0.01399)	71.27th	v5 (v2026.06.15)
Jul 20, 2024	0.20% (0.00202)	58.68th	v3 (v2023.03.01)
May 10, 2024	0.20% (0.00202)	58.03th	v3 (v2023.03.01)
Apr 25, 2024	0.19% (0.00190)	55.83th	v3 (v2023.03.01)
Mar 15, 2024	0.18% (0.00175)	53.61th	v3 (v2023.03.01)
Feb 8, 2024	0.16% (0.00160)	51.33th	v3 (v2023.03.01)
Mar 7, 2023	0.25% (0.00246)	60.72th	v3 (v2023.03.01)
Mar 6, 2023	1.05% (0.01055)	52.13th	v2 (v2022.01.01)
Feb 4, 2022	1.05% (0.01055)	27.52th	v2 (v2022.01.01)
Feb 3, 2022	0.83% (0.00833)	24.94th	v5 (v2026.06.15)
Apr 14, 2021	0.83% (0.00833)	0.00th	v1

Weaknesses (1)

CWE-611

XXE

References (2)

https://s3browser.com/news.aspx
x_refsource_MISCRelease NotesVendor Advisory
https://www.ptsecurity.com/ww-en/analytics/threatscape/pt-2018-34/
x_refsource_MISCThird Party Advisory

Link	Providers	Tags
https://s3browser.com/news.aspx		x_refsource_MISCRelease NotesVendor Advisory
https://www.ptsecurity.com/ww-en/analytics/threatscape/pt-2018-34/		x_refsource_MISCThird Party Advisory

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner mitre

Published Dec 19, 2018

Updated Sep 16, 2024

Reserved Dec 19, 2018

Link CVE-2018-20298

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2018-20298

Red Hat

Severity n/a

Public date n/a

Links CVE-2018-20298