Security readout for executives and security teams
Plain-English summary
CVE-2026-8945 is a high-severity sandbox escape affecting Firefox and Firefox Focus for Android. A successful attack could let malicious web content break out of intended browser isolation after user interaction. Mozilla states it was fixed in Firefox 151.
Executive priority
Treat as a prompt mobile browser update issue. It is high impact but not currently sourced as exploited. Focus on managed Android devices and users handling sensitive data.
Technical view
The issue is described as a sandbox escape with CVSS 3.1 score 7.5: network attack vector, high complexity, no privileges, user interaction required, and high confidentiality, integrity, and availability impact. CWEs listed are CWE-653 and CWE-693.
Likely exposure
Organizations with Android devices running Firefox or Firefox Focus before the Mozilla-fixed version are the main concern. The provided sources do not enumerate every vulnerable prior version or confirm desktop Firefox exposure.
Exploitation context
No active exploitation is supported by the provided sources. The CVE is not listed as KEV. Exploitation requires user interaction and high attack complexity, but impact is broad if successful.
Researcher notes
The public bundle gives limited technical detail and no exploit narrative. The most useful validation path is version exposure mapping against Mozilla’s advisory, with attention to Firefox Focus for Android as named in the title.
Mitigation direction
- Update Firefox and Firefox Focus for Android to version 151 or later.
- Check Mozilla advisory MFSA2026-46 for any product-specific guidance.
- Use MDM or app inventory to identify outdated Android browser installations.
- Prioritize managed Android fleets used for sensitive business workflows.
- Monitor Mozilla and Red Hat pages for revised affected-version details.
Validation and detection
- Confirm installed Firefox and Firefox Focus versions on Android devices.
- Verify app update status through managed app inventory or store records.
- Review Mozilla MFSA2026-46 against deployed browser versions.
- Check Red Hat VEX or advisory data for downstream applicability.
- Document exceptions where devices cannot 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-653: 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 lookupCWE-693: 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-2026-8945 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/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
2 official scoresWe 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:U/C:H/I:H/A:H1.65.9CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H1.65.9redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:H/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.
- ADP timelineredhat-SADP
Made public.
- CVE publishedCVE Program
The CVE record was published.
- ADP timelineredhat-SADP
Reported to Red Hat.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-05-19T14:02:37.120Z: Reported to Red Hat.
- 2026-05-19T12:29:34.775Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.mozilla.org/show_bug.cgi?id=2003171CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2026-46/CVE reference, mozilla
- https://access.redhat.com/security/cve/CVE-2026-8945CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2479863CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8945.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
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 Isolation or Compartmentalization
Improper Isolation or Compartmentalization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Protection Mechanism Failure
Protection Mechanism Failure represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.