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8.8
HIGH • CVSS 3.1

CVE-2022-26485

CISA KNOWN EXPLOITED

Removing an XSLT parameter during processing could have lead to an exploitable use-after-free. We have had reports of attacks in the wild abusing this flaw. This vulnerability affects Firefox < 97.0.2, Firefox ESR < 91.6.1, Firefox for Android < 97.3.0, Thunderbird < 91.6.2, and Focus < 97.3.0.

Prioritization

NVD CVSS
8.8
Published
Dec 22, 2022 3:15 PM EST
Modified
Aug 19, 2026 11:29 AM EDT
CISA KEV
Yes
KEV due date
2022-03-21
CISA required action

Apply updates per vendor instructions.

Red Hat context

No Red Hat-specific cached context is available for this record.

DEFENSIVE REMEDIATION WORKFLOW

Recommended response

  1. Treat as priority because it appears in CISA Known Exploited Vulnerabilities data; follow the required action and due date where applicable.
  2. Identify affected assets with Qualys, Tanium, software inventory, CMDB or configuration-management data.
  3. Confirm package/application applicability before change execution; CVSS alone does not prove that every host is vulnerable.
  4. Patch, upgrade, rehydrate or apply a vendor-approved mitigation through controlled change. GraceITS can automate eligible waves with Ansible/Tanium.
  5. Rescan after remediation and reconcile remaining exceptions, false positives, unsupported systems and compensating controls.
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