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FirefoxWeb browser · Mozilla

CVE-2023-25728

MEDIUM · 6.5 CVSS v3.1 Published 2023-06-02
Fix available
A fix is available. Upgrade to 102.8 / 110.0 or later.
See remediation →
72/100
Remediation priority · Elevated
Remotely reachable No privileges

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
The <code>Content-Security-Policy-Report-Only</code> header could allow an attacker to leak a child iframe's unredacted URI when interaction with that iframe triggers a redirect. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.

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 confidence

The Content-Security-Policy-Report-Only header improperly leaks a child iframe's full unredacted URI when user interaction with that iframe triggers a redirect. This bypasses intended URI sanitization and allows sensitive information in URLs (such as session tokens or parameters) to be exposed to the CSP reporting mechanism.

MitigationUpgrade affected browsers (Firefox to 110+, Thunderbird to 102.8+, Firefox ESR to 102.8+) to receive the patch for this 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:< 110.0
Firefox EsrWeb browser
Affected:< 102.8
ThunderbirdApplication
Affected:< 102.8

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
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 Firefox version
    Navigate to menu > Help > About Firefox, or enter 'about:support' in the address bar to view the version number
    Affected if The version displayed is below 110.0 (for regular Firefox)
  2. Identify installed Firefox ESR version
    Navigate to menu > Help > About Firefox ESR, or enter 'about:support' in the address bar to view the version number
    Affected if The version displayed is below 102.8 (for Firefox ESR)
  3. Identify installed Thunderbird version
    Navigate to menu > Help > About Thunderbird, or enter 'about:support' in the address bar to view the version number
    Affected if The version displayed is below 102.8 (for Thunderbird)
  4. Check for CSP Report-Only header usage with embedded iframes
    Review web application configurations and HTTP response headers for 'Content-Security-Policy-Report-Only' directives that reference or embed third-party iframe content
    Affected if The browser is an affected version AND the user loads web pages that use CSP Report-Only headers with embedded iframe content that can trigger redirects

A user is affected if their installed browser is Firefox below 110.0, Firefox ESR below 102.8, or Thunderbird below 102.8, and they use web applications with Content-Security-Policy-Report-Only headers that load iframes capable of performing redirects.

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 102.8 / 110.0 or later
Fixed in 102.8110.0
Interim mitigation

Upgrade affected browsers (Firefox to 110+, Thunderbird to 102.8+, Firefox ESR to 102.8+) to receive the patch for this vulnerability.

Recommended fix High confidence

Firefox 110.0 | Firefox ESR 102.8 | Thunderbird 102.8

  1. Check current installed version of Firefox, Firefox ESR, or Thunderbird
  2. Download the corresponding fixed version from the official Mozilla download page (www.mozilla.org)
  3. Install the update: For Firefox 110.0, Firefox ESR 102.8, or Thunderbird 102.8 depending on which product is affected
  4. Restart the application after installation
  5. Verify the installed version matches the fixed release

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

Fix this in Firefox Scoped from the published advisory
  • Consultation2.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
14.0 hours of engineering $2,440
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,904.

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-2023-25728 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