CVE-2022-26485

HIGH

8.8

CVSS Score

Published: December 22, 2022 at 12:00 AM UTC

Updated: August 19, 2026 at 03:45 PM UTC

5 products affected across 1 vendorFirefoxThunderbirdFirefox Mobile

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Severity

HIGH8.8

Exploitation

CISA KEV

Exploit prediction

EPSS 14%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score14.3%

EPSS (Exploit Prediction Scoring System) estimates a 14.3% chance this CVE is exploited in the wild within the next 30 days — higher than 97% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Mozilla Firefox contains a use-after-free vulnerability in XSLT parameter processing which can be exploited to perform arbitrary code execution.

Required Action

Apply updates per vendor instructions.

Ransomware Use

Unknown

Added to KEV

Mar 7, 2022

Remediation Due

Mar 21, 2022

1680 days overdue

Notes

https://nvd.nist.gov/vuln/detail/CVE-2022-26485

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox · Mozilla

95%

v < 91.6.1v < 97.0.2v < 97.3.0

Affected range stops below 91.6.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 97.0.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 97.3.0, so it looks safe — our inference, not a vendor statement

Firefox Focus · Mozilla

95%

v < 97.3.0

Affected range stops below 97.3.0, so it looks safe — our inference, not a vendor statement

Firefox Mobile · Mozilla

95%

v < 97.3.0

Affected range stops below 97.3.0, so it looks safe — our inference, not a vendor statement

Thunderbird · Mozilla

95%

v < 91.6.2

Affected range stops below 91.6.2, so it looks safe — our inference, not a vendor statement

Firefox ESR · Mozilla

60%

v < 91.6.1

Affected range stops below 91.6.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

ExploitIssue TrackingVendor Advisory

Source: [email protected]

https://bugzilla.mozilla.org/show_bug.cgi?id=1758062

Vendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2022-09/

US Government Resource

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26485

SSVC — Action Prioritization

SSVCActiveNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusANALYZED

CWE

CWE-416

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