CVE-2022-2200Known exploitationPublic exploitNetwork attack vector

Privileged code execution via inherited tab attributes

Published Dec 22, 2022 · Updated Apr 15, 2025

Prototype pollution in Mozilla Firefox before 102 and Thunderbird before 102 allows remote attackers to execute privileged code. Session Restore's TabAttributesInternal.set() uses a for-in loop on restored tab data and passes inherited names and values to setAttribute(), copying polluted prototype properties onto a restored tab. The chain requires prior Object.prototype corruption; Firefox ESR before 91.11 is affected, while scripting is disabled when Thunderbird reads mail.

CVSS severity8.8
High
EPSS probability23.94%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Prototype pollution in Mozilla Firefox before 102 and Thunderbird before 102 allows remote attackers to execute privileged code. Session Restore's TabAttributesInternal.set() uses a for-in loop on restored tab data and passes inherited names and values to setAttribute(), copying polluted prototype properties onto a restored tab. The chain requires prior Object.prototype corruption; Firefox ESR before 91.11 is affected, while scripting is disabled when Thunderbird reads mail.

The record

CVE
CVE-2022-2200
Published
Dec 22, 2022
Updated
Apr 15, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-1321, T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <102

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <102
Mozilla · Thunderbirdversion=unspecified <102; version=unspecified <91.11
Mozilla · Firefox ESRversion=unspecified <91.11

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-1321Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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