Security readout for executives and security teams
Plain-English summary
CVE-2023-3615 affects the Mattermost iOS app. The app did not properly validate the server certificate when opening a TLS WebSocket connection, so a suitably positioned network attacker could intercept that connection. The public bundle does not show active exploitation or a named fixed version.
Executive priority
Treat this as a high-priority mobile client remediation item if Mattermost iOS is used. The business risk is interception of sensitive collaboration traffic, but urgency is moderated by high attack complexity and no cited active exploitation.
Technical view
This is a CWE-295 certificate validation failure in Mattermost iOS app versions 0 through 2.5.1. During WebSocket TLS initialization, certificate validation could fail open or be insufficient, enabling man-in-the-middle interception with potential confidentiality, integrity, and availability impact. CVSS is 8.1 high with high attack complexity.
Likely exposure
Exposure is likely limited to organizations with Mattermost iOS clients in the affected version range, especially mobile users connecting over networks where interception is plausible. Server-side Mattermost products are not listed as affected in the provided sources.
Exploitation context
The CVE is not listed as KEV, and the supplied sources do not state active exploitation. Exploitation requires a network attacker able to intercept the mobile client’s WebSocket connection; the CVSS vector rates attack complexity as high.
Researcher notes
The provided record identifies the vulnerable component and affected version range, but does not include patch version, commit details, or proof of exploitation. Validate only through version inventory and vendor guidance; avoid assuming impact beyond Mattermost iOS WebSocket TLS certificate validation.
Mitigation direction
- Review Mattermost security updates for fixed builds and deployment guidance.
- Upgrade or retire affected Mattermost iOS app versions according to vendor guidance.
- Use MDM controls to block affected iOS app versions after an approved fixed build is available.
- Prioritize users who access Mattermost from public or otherwise untrusted networks.
Validation and detection
- Inventory Mattermost iOS app versions through MDM or endpoint management.
- Identify any installed Mattermost iOS app version 2.5.1 or earlier.
- Confirm deployed iOS clients align with Mattermost’s published security update guidance.
- Review mobile access patterns for use over higher-risk networks during the exposure period.
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.
CWE-295: Exact CWE lookup
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Open ATT&CK lookupCVE-2023-3615 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://mattermost.com/security-updatesCVE reference
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.
Improper Certificate Validation
Improper Certificate Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.