FirefoxWeb browser · Mozilla
CVE-2022-45411
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedCross-Site Tracing occurs when a server will echo a request back via the Trace method, allowing an XSS attack to access to authorization headers and cookies inaccessible to JavaScript (such as cookies protected by HTTPOnly). To mitigate this attack, browsers placed limits on <code>fetch()</code> and XMLHttpRequest; however some webservers have implemented non-standard headers such as <code>X-Http-Method-Override</code> that override the HTTP method, and made this attack possible again. Thunderbird has applied the same mitigations to the use of this and similar headers. This vulnerability affects Firefox ESR < 102.5, Thunderbird < 102.5, and Firefox < 107.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThunderbird failed to properly restrict the TRACE HTTP method when non-standard headers like X-HTTP-Method-Override are present, allowing malicious web content to potentially access sensitive authorization headers and HTTPOnly-protected cookies that should be inaccessible to JavaScript.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data
FirefoxWeb browser
< 107.0
Firefox EsrWeb browser
< 102.5< 102.5CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check installed Thunderbird versionOpen Thunderbird and go to Help > About Thunderbird. The version number is displayed in the dialog that opens.Affected if The displayed version is below 102.5
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Check installed Firefox versionOpen Firefox and go to Help > About Firefox. The version number is displayed in the dialog that opens.Affected if The displayed version is below 107.0 (or below 102.5 for Firefox ESR)
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Check Firefox ESR versionOpen Firefox ESR and go to Help > About Firefox ESR. The version number is displayed.Affected if The displayed version is below 102.5
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Verify TRACE method accessibility via override headersThis requires examining network traffic or testing with a web server that honors X-HTTP-Method-Override headers to send TRACE requests through the browser. A security scan or penetration test can verify if TRACE responses are returned when the override header is present.Affected if The browser returns TRACE responses containing authorization headers or cookies when X-HTTP-Method-Override: TRACE is sent, indicating the vulnerability is exploitable
A user is affected if they are running Thunderbird below 102.5, Firefox below 107.0, or Firefox ESR below 102.5, AND their browser allows TRACE method access through X-HTTP-Method-Override headers.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped102.5107.0
Update Thunderbird to version 102.5 or later (or Firefox to >=107, Firefox ESR to >=102.5) to receive the applied mitigations that restrict TRACE method access via method-override headers.
Firefox 107 / Firefox ESR 102.5 / Thunderbird 102.5
- Identify which Mozilla product is in use (Firefox, Firefox ESR, or Thunderbird)
- Check the current version of the installed software
- For Firefox: upgrade to version 107 or later
- For Firefox ESR: upgrade to version 102.5 or later
- For Thunderbird: upgrade to version 102.5 or later
- Restart the application after upgrading
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Firefox
Scoped from the published advisory
- Consultation1.0 h
- Implementation1.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,376.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2022-45411 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2022-45411 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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