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FirefoxWeb browser · Mozilla

CVE-2026-7320

HIGH · 7.5 CVSS v3.1 Published 2026-04-28
Fix available
A fix is available. Upgrade to 115.35.1 / 140.10.1 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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 · unedited
Information disclosure due to incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.

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 confidence

Information disclosure vulnerability in the Audio/Video component of Firefox and Thunderbird caused by incorrect boundary conditions, likely leading to out-of-bounds memory reads that expose sensitive data.

MitigationUpdate affected software to Firefox 150.0.1, Firefox ESR 140.10.1/115.35.1, or Thunderbird 150.0.1/140.10.1 or later to remediate the vulnerability.

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
Affected:< 115.35.1< 150.0.1>= 128.0, < 140.10.1
ThunderbirdApplication
Affected:< 140.10.1< 150.0.1

CVSS 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
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify installed Mozilla product
    Check if Firefox or Thunderbird is installed. On Windows, look in Program Files or Program Files (x86). On macOS, check /Applications. On Linux, check package manager or /usr/lib.
    Affected if Either Firefox or Thunderbird is installed
  2. Check Firefox version
    For Firefox: Type 'about:support' in the address bar and look at the 'Version' field, or run 'firefox --version' from command line.
    Affected if Firefox version is less than 115.35.1, OR between 128.0 and 140.10.1, OR less than 150.0.1
  3. Check Thunderbird version
    For Thunderbird: Type 'about:support' in the address bar and look at the 'Version' field, or run 'thunderbird --version' from command line.
    Affected if Thunderbird version is less than 140.10.1 or less than 150.0.1
  4. Confirm Audio/Video component presence
    The vulnerability is in the Audio/Video component which is part of the core browser/mail client. This component is always present in standard Firefox and Thunderbird installations.
    Affected if The Audio/Video component is present (which it is by default in Firefox and Thunderbird)

A user is affected if they have Firefox version below 115.35.1, below 150.0.1 (for versions 128.0+), or below 140.10.1; or Thunderbird version below 140.10.1 or below 150.0.1.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 115.35.1 / 140.10.1 / 150.0.1 or later
Fixed in 115.35.1140.10.1150.0.1
Interim mitigation

Update affected software to Firefox 150.0.1, Firefox ESR 140.10.1/115.35.1, or Thunderbird 150.0.1/140.10.1 or later to remediate the vulnerability.

Recommended fix High confidence

Firefox 150.0.1 (or Firefox ESR 140.10.1 for enterprise environments); Thunderbird 150.0.1 (or Thunderbird ESR 140.10.1)

  1. 1. Close all instances of Firefox or Thunderbird
  2. 2. Open a web browser and navigate to www.mozilla.org to download the latest version
  3. 3. Download Firefox 150.0.1 (for Firefox users) or Thunderbird 150.0.1 (for Thunderbird users)
  4. 4. Run the installer and follow the prompts to complete the installation
  5. 5. After installation, launch the application and verify the version in Help > About Firefox/Thunderbird
  6. 6. Ensure the version shows 150.0.1 or 140.10.1 (ESR) to confirm the patch is applied
Caveat Standard Mozilla release - minimal risk; ensure compatibility with any installed add-ons or extensions

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,060
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-7320 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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