CVE-2022-3033Network attack vector

Reply-triggered message disclosure via compose-context script execution

Published Dec 22, 2022 · Updated Apr 15, 2025

Cross-site scripting in Mozilla Thunderbird before 102.2.1 and before 91.13.1 allows remote attackers to read and alter composed replies. A META refresh in a crafted HTML message starts a blocked remote request, while combined HTML elements execute JavaScript in the reply composer and can redirect the request. Exploitation requires the recipient to reply while the default HTML message-body mode is active; the script can access quoted plaintext, including decrypted content, and transmit it.

CVSS severity8.8
High
EPSS probability0.78%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Mozilla Thunderbird before 102.2.1 and before 91.13.1 allows remote attackers to read and alter composed replies. A META refresh in a crafted HTML message starts a blocked remote request, while combined HTML elements execute JavaScript in the reply composer and can redirect the request. Exploitation requires the recipient to reply while the default HTML message-body mode is active; the script can access quoted plaintext, including decrypted content, and transmit it.

The record

CVE
CVE-2022-3033
Published
Dec 22, 2022
Updated
Apr 15, 2025
Vendor
Mozilla
Product
Thunderbird
Classifications
CWE-79, T1203
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 <102.2.1
  2. Affected versionversion=unspecified <91.13.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Thunderbirdversion=unspecified <102.2.1; version=unspecified <91.13.1

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

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Your stack

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