Security readout for executives and security teams
Plain-English summary
K9Mail versions up to v5.600 reportedly mishandle XML in WebDAV responses. A malicious WebDAV server, or someone able to intercept a legitimate WebDAV response, could trigger confidential data disclosure, denial of service, SSRF, or port scanning behavior.
Executive priority
Treat this as a targeted mobile/email client risk, not a broad enterprise emergency. Prioritize if K9Mail <= v5.600 is deployed or WebDAV use is material.
Technical view
The reported flaw is an XML External Entity issue in K9Mail's WebDAV response parser. The source description ties exploitation to attacker-controlled WebDAV responses, either from a malicious server or an intercepted valid server response. No CVSS, CWE, patch details, or confirmed exploitation evidence are provided in the bundle.
Likely exposure
Exposure is most likely on devices using K9Mail <= v5.600 with WebDAV-backed services or traffic paths where WebDAV responses could be controlled or intercepted.
Exploitation context
The bundle does not show active exploitation or KEV listing. Exploitation appears to require a malicious WebDAV server or interception of a valid WebDAV server response.
Researcher notes
Evidence is sparse in the bundle: impact and attack preconditions are stated, but severity metrics, CWE, fixed version, and exploitation evidence are absent. Avoid asserting active exploitation.
Mitigation direction
- Inventory K9Mail installations and identify versions <= v5.600.
- Check K-9 Mail vendor guidance for fixed versions or recommended remediation.
- Upgrade or retire affected K9Mail deployments where vendor guidance confirms a safe release.
- Reduce exposure to untrusted WebDAV services where operationally possible.
- Prioritize protected transport and trusted networks for WebDAV-dependent accounts.
Validation and detection
- Confirm whether K9Mail <= v5.600 exists on managed endpoints.
- Identify accounts or workflows that rely on WebDAV in K9Mail.
- Review vendor issue references for fixed-version confirmation before closing remediation.
- Check endpoint and network logs for unexpected WebDAV server interactions.
- Document residual exposure where devices cannot be upgraded immediately.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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.
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 lookupCVE-2018-1000831 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/k9mail/k-9/issues/3681CVE reference · x_refsource_MISC
- https://0dd.zone/2018/10/28/k9mail-XXE-MitM/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.