Analyst readout for executives and security teams
Plain-English summary
This Chrome for Windows flaw could let an attacker escape Chrome’s sandbox after first compromising the browser renderer. A user would need to interact with a crafted HTML page. Because sandbox escape can raise the impact of browser compromise, this should be treated as a high-priority browser update issue.
Executive priority
Prioritize within normal emergency browser patch processes. The issue has high impact and a sandbox-escape path, but the supplied evidence requires prior renderer compromise and does not show known active exploitation.
Technical view
CVE-2026-9905 is a CWE-416 use-after-free in Chrome Accessibility on Windows before 148.0.7778.216. The CVSS 3.1 score is 8.3 with network attack vector, high complexity, required user interaction, changed scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Organizations with Google Chrome on Windows versions prior to 148.0.7778.216 may be exposed. The bundle does not identify other Chromium-based browsers, operating systems, or enterprise configurations as affected.
Exploitation context
The CVE describes remote exploitation via a crafted HTML page, but only after the renderer process is already compromised. KEV is false, and the supplied sources do not state active exploitation in the wild.
Researcher notes
The key constraint is the prerequisite renderer compromise. Treat this as a post-renderer-compromise sandbox escape candidate, not a standalone initial-code-execution bug. Public details are limited; avoid assuming exploitability beyond the CVE description.
Mitigation direction
- Update Google Chrome on Windows to 148.0.7778.216 or later where available.
- Follow Google Chrome release guidance for any deployment-specific instructions.
- Prioritize managed Windows browser fleets and high-risk user groups.
- Keep browser sandboxing and site isolation protections enabled.
- Check vendor guidance before applying nonstandard mitigations.
Validation and detection
- Inventory Chrome versions on Windows endpoints.
- Confirm no Windows endpoint runs Chrome earlier than 148.0.7778.216.
- Review browser update telemetry or management console compliance.
- Track the Chromium issue and Chrome release note for revisions.
- Verify KEV status remains false before citing active exploitation.
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-2026-9905 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/498883610 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.