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Vulnerabilities

Vulnerability · CVE-2025-6430

When a file download is specified via the header, that directive would be ignored if the file was included via a or tag, potentially making a website vulnerable to a cross-site scr

Published Jun 24, 2025 · catalog updated Apr 13, 2026 · When a file download

Check this week

CVE-2025-6430 is not in CISA KEV. FIRST estimates a 27.00% chance of exploitation in the next 30 days. Check whether you run When a file download.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (When a file download).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
27.00%
Remediation
Advisory link
Affected products
vendor mozilla

When a file download is specified via the header, that directive would be ignored if the file was included via a or tag, potentially making a website vulnerable to a cross-site scripting attack. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor mozillaversion unspecified

How to fix CVE-2025-6430

  • Recommended remediation

    A patch or advisory reference is linked. Open the original publisher for availability by product version.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-6430 is not in CISA KEV. FIRST estimates a 27.00% chance of exploitation in the next 30 days. Check whether you run When a file download.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 27.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 24, 2025 · EUVD

    Detected

    When a file download is specified via the header, that directive would be ignored if the file was included via a or tag, potentially making a website vulnerable to a cross-site scripting attack. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

  2. Apr 13, 2026 · EUVD

    Updated

    When a file download is specified via the header, that directive would be ignored if the file was included via a or tag, potentially making a website vulnerable to a cross-site scripting attack. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

Sources

  • EUVDVulnerability recordEUVD-2025-21377

    When a file download is specified via the header, that directive would be ignored if the file was included via a or tag, potentially making a website vulnerable to a cross-site scripting attack. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Apr 13, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.