Security readout for executives and security teams
Plain-English summary
This is a high-severity Chrome on Android vulnerability that could let an attacker escape Chrome’s sandbox after first compromising the renderer process. The likely business risk is higher for Android fleets exposed to untrusted web content, but the public bundle does not show active exploitation.
Executive priority
Treat this as a prompt browser patching item for Android fleets, not as a confirmed emergency exploitation event. Prioritize devices used by executives, privileged staff, and users exposed to untrusted web content.
Technical view
CVE-2026-9977 is CWE-20 insufficient input validation in WebShare in Google Chrome on Android before 148.0.7778.216. A remote attacker with renderer-process compromise could potentially achieve sandbox escape through a crafted HTML page. CVSS 3.1 is 8.3 with high complexity and required user interaction.
Likely exposure
Exposure is most relevant to managed or unmanaged Android devices running Chrome versions earlier than 148.0.7778.216. The bundle does not identify other Chromium-based products as affected, so do not assume broader product impact without vendor confirmation.
Exploitation context
The bundle does not report CISA KEV listing or active exploitation. The attack condition is significant: the attacker must already compromise the renderer process, and user interaction with crafted web content is required.
Researcher notes
Public evidence is limited. The Chromium issue may not provide full technical detail, and one reference is a desktop release post while the CVE description names Android. Avoid assuming exploitability details beyond renderer compromise plus potential sandbox escape.
Mitigation direction
- Update Chrome on Android to 148.0.7778.216 or later where available.
- Use MDM controls to enforce Chrome updates across Android fleets.
- Monitor Google Chrome release guidance for Android-specific remediation details.
- Reduce exposure to untrusted browsing on unpatched Android devices.
- Track CVE and Chromium issue updates for additional vendor guidance.
Validation and detection
- Inventory Android devices and record installed Chrome versions.
- Confirm Chrome versions are at least 148.0.7778.216.
- Check MDM compliance reports for update failures or unmanaged devices.
- Review vendor advisories for any added affected products or mitigations.
- Document exceptions for devices unable to update promptly.
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 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-2026-9977 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:H1.66CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
8.3HighVector: 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 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/511741173CVE 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.