Security readout for executives and security teams
Plain-English summary
CVE-2021-26439 is an information disclosure issue in Microsoft Edge for Android. The provided scoring indicates an attacker needs physical access to the device, but successful exploitation could expose highly sensitive information. No active exploitation is shown in the supplied sources.
Executive priority
Address through normal mobile patch management, with faster handling for executives, regulated-data users, shared devices, and unmanaged Android endpoints. The issue is not documented as actively exploited, but confidentiality impact is high if an attacker obtains physical access.
Technical view
The CVSS 3.1 vector is 4.6 medium: AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N with exploit maturity unproven and official remediation indicated. The bundle identifies Microsoft Edge for Android version 1.0.0 as affected. No CWE or root-cause detail is provided.
Likely exposure
Exposure is likely limited to Android endpoints running the affected Microsoft Edge for Android version. The physical attack vector materially reduces broad remote risk, but shared, lost, kiosk, or weakly managed mobile devices could face higher practical exposure.
Exploitation context
CISA KEV is false, and the supplied CVSS temporal metric lists exploit maturity as unproven. The sources do not provide public exploit evidence or operational exploitation details. Treat this as a device-access confidentiality risk, not a confirmed internet-scale campaign.
Researcher notes
The public bundle is sparse: no CWE, no detailed bug class, and no exploit narrative. The strongest technical signals are the physical attack vector, high confidentiality impact, affected Edge for Android listing, and Microsoft advisory reference. Avoid assuming remote exploitability or additional affected platforms.
Mitigation direction
- Review Microsoft MSRC guidance for the fixed Edge for Android release.
- Update Microsoft Edge for Android through managed app deployment or the official app store.
- Prioritize lost-device, shared-device, kiosk, and high-sensitivity user populations.
- Enforce mobile device lock, encryption, and remote wipe policies.
- Track remediation status in MDM or endpoint inventory.
Validation and detection
- Inventory Android devices with Microsoft Edge installed.
- Confirm installed Edge versions against the MSRC advisory.
- Check whether affected devices are managed by MDM.
- Verify update deployment completion for targeted Android devices.
- Review mobile controls for screen lock, encryption, and remote wipe.
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.
CVE-2021-26439 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
- Medium
- CVSS
- 4.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
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:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C0.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.6MediumVector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26439CVE 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.