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CVE Record

CVE-2019-20879: An issue was discovered in Mattermost Server before 5.8.0, 5.7.2, 5.6.5, and 4.10.7.

An issue was discovered in Mattermost Server before 5.8.0, 5.7.2, 5.6.5, and 4.10.7. Changes to e-mail addresses do not require credential re-entry.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Mattermost Server versions before fixed releases allowed account email address changes without asking the user to re-enter credentials. This weakens account protection: if an account session is misused, email changes may be easier than intended. The source bundle does not provide CVSS, affected CPEs, active exploitation evidence, or detailed remediation beyond version thresholds.

Executive priority

Treat this as a moderate account-protection issue. It is not supported by exploitation evidence in the supplied sources, but outdated Mattermost servers should be upgraded because email changes can affect identity, notifications, and recovery workflows.

Technical view

CVE-2019-20879 affects Mattermost Server before 5.8.0, 5.7.2, 5.6.5, and 4.10.7. The described flaw is missing credential re-entry for email address changes. No CWE, CVSS vector, exploit details, or deployment-specific prerequisites are provided in the bundle.

Likely exposure

Organizations running Mattermost Server versions older than 5.8.0, 5.7.2, 5.6.5, or 4.10.7 may be exposed. The bundle does not identify CPEs, hosted-service impact, or configuration-specific scope.

Exploitation context

The provided sources do not claim active exploitation, and the CVE is not marked as KEV. The bundle only states the missing credential re-entry behavior; it does not describe exploit paths, public exploit availability, or attacker prerequisites.

Researcher notes

Evidence is sparse: the CVE text names affected version thresholds and the missing credential re-entry issue only. Avoid assuming account takeover, exploitability, or compensating controls without validating the target Mattermost version and vendor guidance.

Mitigation direction

  • Upgrade Mattermost Server to a listed fixed version or a later supported release.
  • Review Mattermost security updates for branch-specific guidance before scheduling remediation.
  • Prioritize systems where account recovery or email identity controls are business-critical.
  • Monitor vendor advisories for any additional mitigation or backport information.

Validation and detection

  • Inventory Mattermost Server versions across production and non-production environments.
  • Confirm no instance runs before 5.8.0, 5.7.2, 5.6.5, or 4.10.7.
  • Review account audit logs for unexpected email address changes.
  • Check whether local procedures require reauthentication for sensitive account changes.
Prepared
Confidence
medium
Sources
3

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

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description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2019-20879 mapping review

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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
2Source 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.