How severe is CVE-2022-26485?

CVE-2022-26485 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-26485 being actively exploited?

Yes. CVE-2022-26485 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-07, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2022-26485?

CVE-2022-26485 primarily affects Mozilla Firefox. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2022-26485?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2022-26485 have an EU (EUVD) identifier?

Yes. CVE-2022-26485 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-31043. It is also flagged as exploited in the EUVD (since 2022-03-07).

When was CVE-2022-26485 published?

CVE-2022-26485 was published on 2022-12-22 and last updated on 2026-06-17.

CVE-2022-26485

CVE-2022-26485 is a high-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-03-07). The underlying weakness is classified as CWE-416.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 14% (96th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-03-07)
EU (EUVD) id: EUVD-2022-31043
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-03-07)
Weakness: CWE-416
Affected product: Mozilla Firefox
Published: 2022-12-22
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2022-26485?: 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.
How severe is CVE-2022-26485?: CVE-2022-26485 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-26485 being actively exploited?: Yes. CVE-2022-26485 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-07, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2022-26485?: CVE-2022-26485 primarily affects Mozilla Firefox. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2022-26485?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2022-26485 have an EU (EUVD) identifier?: Yes. CVE-2022-26485 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2022-31043. It is also flagged as exploited in the EUVD (since 2022-03-07).
When was CVE-2022-26485 published?: CVE-2022-26485 was published on 2022-12-22 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:android:*:*
cpe:2.3:a:mozilla:firefox_focus:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

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