XML External Entity (XXE) vulnerability in bw-calendar-engine

CRITICAL 9.0CVE-2018-1000836 · GHSA-xmvg-w4f9-99r7 · Published 20/12/2018 · updated 17/06/2026

In short

CVE-2018-1000836 is a CRITICAL (CVSS 9.0) vulnerability affecting org.bedework.caleng:bw-calendar-engine, bw-calendar-engine (apereo).
Chance of exploitation in the next 30 days (EPSS): 1.1%, higher than 66.4% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
org.bedework.caleng:bw-calendar-engine Maven	`≤ 3.12.2`	No fix yet
bw-calendar-engine apereo	`≤ 3.12.0`	No fix yet

Description

bw-calendar-engine version <= bw-calendar-engine-3.12.0 contains a XML External Entity (XXE) vulnerability in IscheduleClient XML Parser that can result in Disclosure of confidential data, denial of service, SSRF, port scanning. This attack appear to be exploitable via Man in the Middle or malicious server.

NVD description

References

nvd.nist.gov/vuln/detail/CVE-2018-1000836 · ADVISORY
Bedework/bw-calendar-engine · WEB
0dd.zone/2018/10/28/bw-calendar-engine-XXE-MitM · WEB
Bedework/bw-calendar-engine · PACKAGE
GitHub Advisory GHSA-xmvg-w4f9-99r7 · ADVISORY
0dd.zone/2018/10/28/bw-calendar-engine-XXE-MitM · Third Party Advisory

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In short

CVE-2018-1000836 is a CRITICAL (CVSS 9.0) vulnerability affecting org.bedework.caleng:bw-calendar-engine, bw-calendar-engine (apereo).

Chance of exploitation in the next 30 days (EPSS): 1.1%, higher than 66.4% of all vulnerabilities.

No patched version is listed yet: follow the vendor's advisory in References.

Package

Affected versions

Patched versions

org.bedework.caleng:bw-calendar-engine

Maven

≤ 3.12.2

No fix yet

bw-calendar-engine

apereo

≤ 3.12.0

No fix yet

Description

NVD description