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CVE Record

CVE-2018-1000836: bw-calendar-engine version <= bw-calendar-engine-3.12.0 contains a XML External Entity (XXE) vulnerability...

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.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This flaw affects bw-calendar-engine up to 3.12.0 when its iSchedule client parses XML from an untrusted or intercepted source. A malicious server or man-in-the-middle could make the application disclose data, make internal network requests, scan ports, or cause denial of service.

Executive priority

Treat this as a targeted exposure issue, not a confirmed internet-wide emergency. Prioritize organizations using Bedework calendar integrations with external scheduling servers, because the business impact could include data disclosure and internal network probing from a trusted application.

Technical view

CVE-2018-1000836 is an XXE issue in the IscheduleClient XML parser of bw-calendar-engine <= 3.12.0. The public description cites confidential data disclosure, denial of service, SSRF, and port scanning impacts. Exploitability is described as requiring a malicious server or man-in-the-middle position.

Likely exposure

Exposure is likely limited to deployments running bw-calendar-engine <= 3.12.0 with iSchedule client functionality that processes XML from external calendar servers. The CVE bundle does not provide CPEs or reliable vendor/product metadata beyond the project name.

Exploitation context

The source bundle says exploitation appears possible through a man-in-the-middle position or a malicious server. CISA KEV is false, and the provided sources do not support a claim of active exploitation in the wild.

Researcher notes

Evidence is incomplete: the CVE has no CVSS, CWE, or CPE data, and affected metadata is generic. Analysis should stay tied to bw-calendar-engine <= 3.12.0 and the iSchedule XML parser until project issue details or vendor guidance confirm more.

Mitigation direction

  • Inventory bw-calendar-engine versions and identify any deployments at or below 3.12.0.
  • Review Bedework project guidance for fixed releases, parser hardening, or configuration changes.
  • Restrict calendar service outbound network access to required destinations only.
  • Disable or isolate affected iSchedule client use if vendor guidance is unavailable.
  • Monitor Bedework issue updates and the CVE record for remediation details.

Validation and detection

  • Confirm whether bw-calendar-engine is present in application dependencies or deployed services.
  • Verify the running version and compare it with the <= 3.12.0 affected range.
  • Map whether iSchedule client code parses XML from external or federated servers.
  • Review logs for unexpected outbound requests during calendar scheduling operations.
  • Check parser configuration for external entity handling and network access behavior.
Prepared
Confidence
medium
Sources
4

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

Cloud metadata behavior lookup

The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2018-1000836 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.