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ExploitedIn CISA KEVFix available

CVE-2022-26485

Exploitation confirmed. First attested on 2022-03-07 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2022-12-22
  • Fixed in97.0.2 · 91.6.1
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2022-03-07Added to the CISA KEV catalogCISA KEV
  2. 2022-03-07Listed as exploited by GCVEGCVE
  3. 2022-03-07Exploitation first reportedCISA KEV
  4. 2022-12-2220:15CVE publishedNVD
  5. 2025-01-2821:32SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-26485?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-26485?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Mozilla firefox
BranchAffectedFixed in
97.0< 97.0.297.0.2
91.6< 91.6.191.6.1
Mozilla firefox focus
BranchAffectedFixed in
97.3< 97.3.097.3.0
Mozilla firefox mobile
BranchAffectedFixed in
97.3< 97.3.097.3.0

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA5 products

As mozilla, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Mozilla Firefox
    Affected
    • < 97.0.2fixed in 97.0.2custom
  • Mozilla Firefox ESR
    Affected
    • < 91.6.1fixed in 91.6.1custom
  • Mozilla Firefox for Android
    Affected
    • < 97.3.0fixed in 97.3.0custom
  • Mozilla Thunderbird
    Affected
    • < 91.6.2fixed in 91.6.2custom
  • Mozilla Focus
    Affected
    • < 97.3.0fixed in 97.3.0custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2022-12-22

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxUbuntu:22.04:LTSall versions · fixed in 1:1snap1-0ubuntu1
  • firefoxUbuntu:20.04:LTSall versions · fixed in 97.0.2+build1-0ubuntu0.20.04.1
  • firefoxUbuntu:18.04:LTSall versions · fixed in 97.0.2+build1-0ubuntu0.18.04.1
  • firefoxRocky Linux:8all versions · fixed in 0:91.7.0-3.el8_5
  • firefoxRed Hat:rhel_eus:8.4::appstreamall versions · fixed in 0:91.7.0-3.el8_4and 2 other packages
  • firefoxRed Hat:rhel_eus:8.2::appstreamall versions · fixed in 0:91.7.0-3.el8_2and 2 other packages
  • firefoxRed Hat:rhel_e4s:8.1::appstreamall versions · fixed in 0:91.7.0-3.el8_1and 2 other packages
  • firefoxRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:91.7.0-3.el8_5and 2 other packages

102 more package ranges on OSV.dev

Vendor advisories

  • CVE-2022-26485 Red Hat Product Security118 products fixed · 8 known affected

    Mozilla: Use-after-free in XSLT parameter processing

    firefox as a component of Red Hat Enterprise Linux 6 · firefox.src as a component of Red Hat Enterprise Linux 6 · thunderbird as a component of Red Hat Enterprise Linux 6 · +5 more

  • RHSA-2022:0850 Red Hat Product Security11 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:0853 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:0845 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:0847 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2022:0843 Red Hat Product Security10 products fixed

    Red Hat Security Advisory: thunderbird security update

5 more advisories

Full record on NVD

Fix

  1. Update Mozilla firefox to 97.0.2 · 91.6.1
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-03-21
  3. Vendor fix Red Hat Product Security RHSA-2022:0850 · 11 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
  4. Vendor fix Red Hat Product Security RHSA-2022:0824 · 18 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect.

Advisories and patches

Detection

read 2026-11-03 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedmistymntncop/CVE-2022-26485
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-03-07
Patch Due Date
2022-03-21
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2022-12-22
Last Modified
2026-08-19
NVD status
Analyzed
GitHub Advisory
GHSA-rj77-m66j-h24w

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.

Is CVE-2022-26485 actively exploited?

Yes. CVE-2022-26485 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-03-21.

What is the CVSS score for CVE-2022-26485?

CVE-2022-26485 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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