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CVE-2022-26485

8.8, high Known exploited

Mozilla Firefox Use-After-Free Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
8.8, high high CVSS v3.1
EPSS, next 30 days
14% higher than 96.5% of scored CVEs
Exploitation
Confirmed in the wild
Published
22 Dec 20223 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 7 Mar 2022. US federal agencies had to remediate by 21 Mar 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

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.

Details

Vendor
Mozilla
Product
Firefox
Weakness
CWE-416 (opens in a new tab)
Status
Analyzed
Updated
19 Aug 2026
Assigner
security@mozilla.org

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References 3

Exploit code 1

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Mozilla CVEs

Every Mozilla CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2024-9680 Mozilla Firefox Use-After-Free Vulnerability KEV EPSS 23% 9.8, critical
  • CVE-2022-26486 Mozilla Firefox Use-After-Free Vulnerability KEV EPSS 2% 9.6, critical
  • CVE-2020-6819 Mozilla Firefox And Thunderbird Use-After-Free Vulnerability KEV EPSS 3% 8.1, high
  • CVE-2020-6820 Mozilla Firefox And Thunderbird Use-After-Free Vulnerability KEV EPSS 7% 8.1, high
  • CVE-2019-17026 Mozilla Firefox And Thunderbird Type Confusion Vulnerability KEV EPSS 46% 8.8, high
  • CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Vulnerability KEV EPSS 38% 8.8, high
  • CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability KEV EPSS 56% 10, critical
  • CVE-2016-9079 Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability KEV EPSS 88% 7.5, high

Beyond this page

Is CVE-2022-26485 in your network?

This page tells you how dangerous CVE-2022-26485 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2022-26485 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 16 Oct 2026, not the live upstream state.