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PatchSiren cyber security CVE debrief

CVE-2022-26486 Mozilla CVE debrief

CVE-2022-26486 is a Mozilla Firefox use-after-free vulnerability that CISA added to its Known Exploited Vulnerabilities catalog on 2022-03-07. Because it is listed as known to be exploited, defenders should treat this as a high-priority patching item and follow Mozilla’s update guidance without delay.

Vendor
Mozilla
Product
Firefox
CVSS
CRITICAL 9.6
CISA KEV
Listed
Original CVE published
2022-03-07
Original CVE updated
2022-03-07
Advisory published
2022-03-07
Advisory updated
2022-03-07

Who should care

Organizations that use Mozilla Firefox on managed endpoints, including security operations, endpoint management, vulnerability management, and IT teams. Users and administrators responsible for browser patching should prioritize this CVE because CISA lists it as actively exploited.

Technical summary

The public record identifies the issue as a use-after-free vulnerability in Mozilla Firefox. The source corpus does not provide version ranges, exploit mechanics, or impact details beyond the vulnerability class and its inclusion in CISA’s Known Exploited Vulnerabilities catalog.

Defensive priority

Urgent. CISA KEV inclusion indicates known exploitation, and the catalog lists a due date of 2022-03-21 for applying updates per vendor instructions.

Recommended defensive actions

  • Apply Mozilla’s recommended Firefox updates as soon as possible.
  • Verify all Firefox installations across managed and unmanaged endpoints are covered by the update process.
  • Confirm remediation is completed before the CISA KEV due date of 2022-03-21.
  • Track patch compliance in vulnerability management and endpoint management systems.
  • Review Mozilla and CISA advisories for any vendor-specific remediation guidance.

Evidence notes

This debrief is based only on the supplied public records: the CVE record, NVD detail page, and CISA’s Known Exploited Vulnerabilities catalog entry. The source corpus identifies the issue as a Mozilla Firefox use-after-free vulnerability and records CISA KEV dates of 2022-03-07 added and 2022-03-21 due. No CVSS score, affected versions, exploit chain, or remediation specifics beyond 'apply updates per vendor instructions' were supplied.

Sources and references

Verified primary and authoritative sources

  • CVE-2022-26486 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2022-26486

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2022-26486 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2022-26486

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.