Security readout for executives and security teams
Plain-English summary
This is a Mozilla browser and email client memory-safety flaw that was abused in real attacks. A user running an affected version could be exposed through malicious web content or content rendered by the vulnerable Mozilla application. Treat it as urgent where Firefox, Firefox ESR, Firefox for Android, Thunderbird, or Focus remain outdated.
Executive priority
Prioritize same-day remediation for any affected versions because exploitation is documented and the vulnerable products are commonly exposed to untrusted web or email content.
Technical view
CVE-2022-26485 is a CWE-416 use-after-free in XSLT parameter handling during processing. Mozilla lists it as affecting Firefox before 97.0.2, Firefox ESR before 91.6.1, Firefox for Android before 97.3.0, Thunderbird before 91.6.2, and Focus before 97.3.0. CVSS 3.1 is 8.8 with network attack vector and user interaction required.
Likely exposure
Exposure is most likely on endpoints, mobile devices, and email workstations still running affected Mozilla versions. Managed enterprise browsers may already be updated, but unmanaged BYOD, ESR deployments, Android installs, and Thunderbird clients are common places to verify.
Exploitation context
Active exploitation is supported by Mozilla's statement that attacks in the wild abused the flaw and by CISA KEV inclusion. The provided sources do not describe exploit mechanics, actors, targeting, or campaign scale.
Researcher notes
The source bundle does not include low-level root-cause detail beyond XSLT parameter removal causing use-after-free. Validation should stay version-based unless Mozilla or Bugzilla access provides more detail. Avoid assuming affected downstream products unless independently confirmed.
Mitigation direction
- Upgrade Firefox to 97.0.2 or later.
- Upgrade Firefox ESR to 91.6.1 or later.
- Upgrade Firefox for Android and Focus to 97.3.0 or later.
- Upgrade Thunderbird to 91.6.2 or later.
- Check current Mozilla and CISA guidance for any environment-specific direction.
Validation and detection
- Inventory installed Mozilla product versions across desktop, mobile, and email clients.
- Confirm vulnerability scanners no longer report CVE-2022-26485 after updates.
- Review browser management and mobile management policies for forced update coverage.
- Identify any ESR or Thunderbird exceptions that may lag standard browser patching.
- Check CISA KEV tracking if your organization follows BOD-style remediation deadlines.
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-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 lookupCVE-2022-26485 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
- Yes
- 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.
CISA KEV status
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://www.mozilla.org/security/advisories/mfsa2022-09/CVE reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1758062CVE reference
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26485CVE reference · government-resource
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.