Security readout for executives and security teams
Plain-English summary
CVE-2026-9987 is a high-severity Chrome on Android flaw where a malicious file could, with user interaction, let a local attacker run code on the device. Risk is highest for Android fleets handling untrusted files. The bundle does not confirm active exploitation.
Executive priority
Treat as high priority for managed Android fleets because successful exploitation could compromise device data and integrity. Prioritize patch verification, especially for users likely to receive untrusted files.
Technical view
The issue is CWE-20 insufficient input validation in WebAppInstalls in Google Chrome on Android prior to 148.0.7778.216. CVSS 3.1 is 7.8 with local attack vector, low complexity, no privileges, required user interaction, unchanged scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Potential exposure is Chrome on Android installations older than 148.0.7778.216. The supplied affected-version field is ambiguous, so teams should verify exact Android build exposure against Google guidance.
Exploitation context
The source describes local arbitrary code execution via a malicious file and requires user interaction. KEV is false, and the bundle provides no evidence of exploitation in the wild or public exploit availability.
Researcher notes
Evidence is limited to CVE metadata and Google/Chromium references. The Chrome Releases link title references desktop, while the CVE text names Android, so validate platform-specific release details before scoping broadly.
Mitigation direction
- Update Chrome on Android to 148.0.7778.216 or later when available.
- Confirm Google’s Chrome release guidance for the exact Android fixed version.
- Restrict handling of untrusted files on managed Android devices until updated.
- Prioritize managed devices used by executives, administrators, and high-risk staff.
Validation and detection
- Inventory Chrome versions across Android device management tooling.
- Flag devices running Chrome versions earlier than 148.0.7778.216.
- Verify Chrome update status after remediation completes.
- Review mobile security telemetry for suspicious file-open events where available.
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-20: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-9987 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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.
SSVC decision data
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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.htmlCVE reference, Chrome
- https://issues.chromium.org/issues/513046475CVE reference, Chrome
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.