CVE-2025-30434
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 · uneditedThe issue was addressed with improved input sanitization. This issue is fixed in iOS 18.4 and iPadOS 18.4. Processing a maliciously crafted file may lead to a cross site scripting attack.
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 · moderate confidenceA cross-site scripting vulnerability in iOS 18.4 and iPadOS 18.4 allows execution of arbitrary JavaScript through processing of maliciously crafted files. The issue stems from insufficient input sanitization when the system parses certain file types, allowing injected script content to be executed in the context of the application processing the file.
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< 18.4< 18.4CVSS 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
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:L/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 iOS version on the deviceOpen Settings app, tap General, tap About, and note the version number displayed next to 'Version'Affected if The version number is less than 18.4 (for example, 18.3.1, 18.3, 18.2, etc.)
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Check iPadOS version on the deviceOpen Settings app on the iPad, tap General, tap About, and note the version number displayed next to 'Version'Affected if The version number is less than 18.4 (for example, 18.3.1, 18.3, 18.2, etc.)
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Confirm device model and operating systemOn the same About screen, verify the device name (iPhone or iPad) and confirm the OS is iOS or iPadOS respectivelyAffected if The device is an iPhone running iOS or an iPad running iPadOS with version below 18.4
The device is affected if it is an iPhone or iPad running any version of iOS or iPadOS prior to 18.4, as the vulnerability exists in those earlier versions.
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 · scoped18.4
Update affected iOS/iPadOS devices to version 18.4 or later to receive the improved input sanitization that addresses this vulnerability.
iOS 18.4 and iPadOS 18.4
- Back up your iPhone or iPad data before updating
- Go to Settings > General > Software Update on the device
- Download and install iOS 18.4 (for iPhone) or iPadOS 18.4 (for iPad)
- Restart the device if prompted to complete the installation
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation2.0 h
- Testing1.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-30434 — 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-2025-30434 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