Security readout for executives and security teams
Plain-English summary
CVE-2026-4722 is a high-severity Mozilla vulnerability involving privilege escalation in an IPC component. Mozilla states it was fixed in Firefox 149 and Thunderbird 149. Successful exploitation could let an attacker gain higher privileges after user interaction. There is no provided evidence of active exploitation or CISA KEV listing.
Executive priority
Treat as a high-priority client software update. The vulnerability has high potential impact, but current evidence does not show active exploitation. Focus on rapid patch validation for Firefox and Thunderbird installations that process internet or email content.
Technical view
The CVSS 3.1 score is 8.8 with network attack vector, low complexity, no privileges required, and required user interaction. Impact is rated high for confidentiality, integrity, and availability. The source text identifies privilege escalation in IPC but does not provide root cause details. The affected-version data is limited and appears inconsistent with the “fixed in 149” statement.
Likely exposure
Organizations using Mozilla Firefox or Thunderbird before applying the vendor-fixed releases may be exposed. The provided data names Firefox and Thunderbird and says the issue was fixed in version 149, but does not clearly enumerate all vulnerable versions or platforms.
Exploitation context
Exploitation requires user interaction according to the CVSS vector. No supplied source states that exploitation is active in the wild, and the CVE is not marked as KEV. Technical exploitation details are not available in the provided sources.
Researcher notes
Public detail is sparse. The record identifies privilege escalation in IPC and provides CVSS metrics, but not the specific flaw class. The bundle lists version 149 as affected while the description says fixed in 149, so validate against Mozilla advisories before drawing version-scope conclusions.
Mitigation direction
- Review Mozilla advisories MFSA2026-20 and MFSA2026-23 for affected-version details.
- Update Firefox and Thunderbird to the vendor-fixed release where applicable.
- Prioritize systems where browsers or mail clients handle untrusted content.
- Monitor Mozilla guidance for corrected or expanded affected-version information.
Validation and detection
- Inventory deployed Firefox and Thunderbird versions across endpoints.
- Compare installed versions against Mozilla advisory guidance.
- Confirm update deployment through endpoint management or software inventory records.
- Track the Bugzilla entry for additional technical or remediation details.
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.
Privilege 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-2026-4722 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/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.
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:L/PR:N/UI:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.mozilla.org/show_bug.cgi?id=2010097CVE reference
- https://www.mozilla.org/security/advisories/mfsa2026-20/CVE reference
- https://www.mozilla.org/security/advisories/mfsa2026-23/CVE reference
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.