Analyst readout for executives and security teams
Plain-English summary
This Chrome on Android issue is a memory safety flaw in WebView. If an attacker first compromises the renderer process, a crafted HTML page could potentially break out of the browser sandbox. That raises business urgency for Android fleets, especially unmanaged or slow-to-update devices.
Executive priority
Treat as a high-priority mobile browser update. The issue has critical Chromium severity and sandbox-escape potential, but exploitation evidence is not provided, and the attack chain appears to require a prior renderer compromise.
Technical view
CVE-2026-9888 is a CWE-416 use-after-free in WebView in Google Chrome on Android before 148.0.7778.216. The CVSS 3.1 score is 8.3 with high confidentiality, integrity, and availability impact, but attack complexity is high and user interaction is required.
Likely exposure
Exposure is most likely on Android devices running Chrome before 148.0.7778.216. The bundle does not prove exposure for other Google or Android WebView packages, so inventory should stay tied to vendor records.
Exploitation context
The CVE description requires a compromised renderer process and a crafted HTML page. The source bundle marks KEV as false, and no provided source states active exploitation in the wild.
Researcher notes
The record is recent and sparse. Key constraints are renderer compromise, crafted HTML, and Android Chrome before 148.0.7778.216. Chromium issue details may be restricted, so avoid assuming root cause, exploitability, or affected components beyond the CVE text.
Mitigation direction
- Update Chrome on Android to version 148.0.7778.216 or later where available.
- Check Google Chrome release guidance for exact fixed builds and platform notes.
- Prioritize managed Android devices and high-risk user groups for update enforcement.
- Monitor vendor advisories for any WebView-specific clarification or follow-up fixes.
Validation and detection
- Inventory Android Chrome versions across managed and BYOD-accessing devices.
- Confirm no devices remain below 148.0.7778.216 after update enforcement.
- Review mobile browser update compliance in endpoint or MDM reporting.
- Track whether CISA KEV status changes after publication.
Public sources used
Based on public source material and reviewed before publication.
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-416: 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-9888 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
- 8.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/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:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H 1.6 6 CISA-ADP Vulnerability scoring details
Base CVSS 3.1 score
8.3 HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/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 reserved CVE Program
The CVE ID was reserved by the assigning CNA.
- CVE published CVE Program
The CVE record was published.
- CVE updated CVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 source CVE List V5
- https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html CVE reference, Chrome
- https://issues.chromium.org/issues/511715166 CVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.