FirefoxWeb browser · Mozilla
CVE-2024-9397
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 · uneditedA missing delay in directory upload UI could have made it possible for an attacker to trick a user into granting permission via clickjacking. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Thunderbird < 128.3, and Thunderbird < 131.
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 confidenceA missing delay in the directory upload UI in Firefox and Thunderbird allows clickjacking attacks where attackers can trick users into granting directory access permissions without proper user consent. The absence of a time delay between the UI interaction and permission prompt makes the permission grant action vulnerable to being overlaid and exploited.
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
< 131.0
Firefox EsrWeb browser
< 128.3.0< 128.3= 129.0CVSS 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.
-
Check Firefox versionNavigate to Menu > Help > About Firefox (or enter 'about:support' in address bar) to view the installed version numberAffected if Version is below 131.0 for regular Firefox or below 128.3.0 for Firefox ESR
-
Check Thunderbird versionNavigate to Menu > Help > About Thunderbird to view the installed version numberAffected if Version is below 128.3 or equals 129.0
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Verify directory upload feature usageThe vulnerability requires a website attempting to use the directory upload API (input type='directory') - check if you have granted any website permissions for directory access in Firefox (about:permissions) or ThunderbirdAffected if You have granted directory access permissions to any website and your product version is vulnerable
You are affected if you use a vulnerable version (Firefox < 131.0, Firefox ESR < 128.3.0, Thunderbird < 128.3 or = 129.0) and you interact with websites that use the directory upload feature.
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 · scoped128.3128.3.0131.0
Update affected Mozilla products to Firefox 131, Firefox ESR 128.3, Thunderbird 128.3, or Thunderbird 131 which contain the fix for the missing delay in the directory upload UI.
Firefox 131.0+, Firefox ESR 128.3.0+, Thunderbird 128.3.0+ or 131.0+
- Open Firefox/Thunderbird and navigate to Help > About [Product Name]
- If an update is available, click 'Update' to download and install it
- Restart the browser/application after the update completes
- Alternatively, download the latest version from https://www.mozilla.org/ for your platform
- For enterprise deployments, use the version-specific downloads: Firefox 131.0+, Firefox ESR 128.3.0+, Thunderbird 128.3.0+ or 131.0+
Generated from the published advisory — verify against the referenced sources before acting.
Fix this in Firefox
Scoped from the published advisory
- Consultation2.0 h
- Implementation2.0 h
- Testing1.0 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 $1,744.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-9397 — 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-2024-9397 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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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- 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
- No spam, self-promotion, credentials, or personal data