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NVD / CVE Program· CNA mozilla

CVE-2025-6430: Content-Disposition header ignored when a file is included in an embed or object tag

Noroxi assessment

Priority: Monitor (action score 24/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.26% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: firefox (AlmaLinux:10) 128.12.0-1.el10_0; firefox (AlmaLinux:8) 128.12.0-1.el8_10.alma.1; thunderbird (AlmaLinux:8) 128.12.0-1.el8_10.alma.1.

Low priority for now. Upgrade to firefox (AlmaLinux:10) 128.12.0-1.el10_0; firefox (AlmaLinux:8) 128.12.0-1.el8_10.alma.1; thunderbird (AlmaLinux:8) 128.12.0-1.el8_10.alma.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

When a file download is specified via the `Content-Disposition` header, that directive would be ignored if the file was included via a `<embed>` or `<object>` 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.

MediumCVSS 6.1 · v3.1—No exploit Fix available
Published
Jun 24, 2025
Updated
Oct 23, 2026
EPSS
0.2% · 18th percentile

Report tools

JSON

Action score

24

Monitor

Low priority for now.

CVSS
24 / 40 · 6.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-6430

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mozillafirefox

Limit the impact of XSS

This is a cross-site scripting (XSS) vulnerability. A well-configured Content-Security-Policy doesn't fix it, but greatly reduces its impact. Check your site's CSP and other security headers for free.

Check security headers

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla firefoxbefore 128.12.0
  • mozilla firefoxbefore 140.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Firefox

    • 128.12 and later · up to and including 128.*not affected · rpm
    • 140 and laternot affected · rpm

  • Mozilla Thunderbird

    • 128.12 and later · up to and including 128.*not affected · rpm
    • 140 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10firefoxbefore 128.12.0-1.el10_0128.12.0-1.el10_0
AlmaLinux:8firefoxbefore 128.12.0-1.el8_10.alma.1128.12.0-1.el8_10.alma.1
AlmaLinux:8thunderbirdbefore 128.12.0-1.el8_10.alma.1128.12.0-1.el8_10.alma.1
AlmaLinux:9firefoxbefore 128.12.0-1.el9_6.alma.1128.12.0-1.el9_6.alma.1
AlmaLinux:9firefox-x11before 128.12.0-1.el9_6.alma.1128.12.0-1.el9_6.alma.1
Debian:11firefox-esrbefore 128.12.0esr-1~deb11u1128.12.0esr-1~deb11u1
Debian:11thunderbirdbefore 1:128.12.0esr-1~deb11u11:128.12.0esr-1~deb11u1
Debian:12firefox-esrbefore 128.12.0esr-1~deb12u1128.12.0esr-1~deb12u1
Debian:12thunderbirdbefore 1:128.12.0esr-1~deb12u11:128.12.0esr-1~deb12u1
Debian:13firefox-esrbefore 128.12.0esr-1128.12.0esr-1
Debian:13thunderbirdbefore 1:128.12.0esr-11:128.12.0esr-1
openSUSE:Leap 15.6MozillaFirefoxbefore 128.12.0-150200.152.188.1128.12.0-150200.152.188.1
openSUSE:Leap 15.6MozillaFirefoxbefore 140.1.0-150200.152.193.1140.1.0-150200.152.193.1
openSUSE:Leap 15.6MozillaFirefox-branding-SLEbefore 140-150200.9.21.1140-150200.9.21.1
openSUSE:Leap 15.6MozillaThunderbirdbefore 128.12.0-150200.8.227.2128.12.0-150200.8.227.2
openSUSE:Leap 15.6MozillaThunderbirdbefore 140.1.0-150200.8.230.1140.1.0-150200.8.230.1
openSUSE:Leap 16.0mozjs128before 128.14.0-160000.1.1128.14.0-160000.1.1
openSUSE:Tumbleweedfirefox-esrbefore 128.12.0-1.1128.12.0-1.1
openSUSE:TumbleweedMozillaFirefoxbefore 140.0.2-1.1140.0.2-1.1
openSUSE:TumbleweedMozillaThunderbirdbefore 128.12.0-1.1128.12.0-1.1
openSUSE:Tumbleweedmozjs128before 128.12.0-1.1128.12.0-1.1
Red Hat:enterprise_linux:10.0firefoxbefore 0:128.12.0-1.el10_00:128.12.0-1.el10_0
Red Hat:enterprise_linux:10.0firefox-debuginfobefore 0:128.12.0-1.el10_00:128.12.0-1.el10_0
Red Hat:enterprise_linux:10.0firefox-debugsourcebefore 0:128.12.0-1.el10_00:128.12.0-1.el10_0

+84

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x befKEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypassKEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-6428Jun 24, 2025 · Firefox for Android opened URLs specified in a link querystring parameter
    17Monitor
  • ← EarlierCVE-2025-6429Jun 24, 2025 · Incorrect parsing of URLs could have allowed embedding of youtube.com
    26Monitor
  • Later →CVE-2025-6431Jun 24, 2025 · The prompt in Firefox for Android that asks before opening a link in an external application could be bypassed
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:firefox128.12.0-1.el9_6.alma.1 · AlmaLinux:9Package registry (OSV)
almalinux:firefox-x11128.12.0-1.el9_6.alma.1 · AlmaLinux:9Package registry (OSV)
almalinux:thunderbird128.12.0-1.el8_10.alma.1 · AlmaLinux:8Package registry (OSV)
debian:firefox-esr128.12.0esr-1~deb12u1 · Debian:12Package registry (OSV)
debian:thunderbird1:128.12.0esr-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:firefox-esr128.12.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:MozillaFirefox128.12.0-150200.152.188.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:MozillaFirefox-branding-SLE140-150200.9.21.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:MozillaThunderbird128.12.0-150200.8.227.2 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:mozjs128128.12.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:mozjs128128.14.0-160000.1.1 · openSUSE:Leap 16.0Package registry (OSV)
red hat:firefox0:128.12.0-1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:firefox-debuginfo0:128.12.0-1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:firefox-debugsource0:128.12.0-1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:firefox-x110:128.12.0-1.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird0:128.12.0-1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:thunderbird-debuginfo0:128.12.0-1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
red hat:thunderbird-debugsource0:128.12.0-1.el9_4 · Red Hat:rhel_eus:9.4::appstreamPackage registry (OSV)
rocky linux:firefox0:128.12.0-1.el9_6 · Rocky Linux:9Package registry (OSV)
rocky linux:thunderbird0:128.12.0-1.el10_0 · Rocky Linux:10Package registry (OSV)
suse:MozillaFirefox128.12.0-150200.152.188.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP6Package registry (OSV)
suse:MozillaFirefox-branding-SLE140-150200.9.21.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP6Package registry (OSV)
suse:MozillaFirefox-branding-SLE140-35.19.5 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:MozillaThunderbird128.12.0-150200.8.227.2 · SUSE:Linux Enterprise Module for Package Hub 15 SP6Package registry (OSV)
suse:mozjs128128.14.0-160000.1.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:pipewire0.3.6-150200.3.11.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP6Package registry (OSV)
suse:xdg-desktop-portal1.8.0-150200.5.8.1 · SUSE:Linux Enterprise High Performance Computing 15 SP3-LTSSPackage registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-1053484 days apartSpoofing issue in the Site Permissions component
    32Monitor
  • CVE-2024-4776406 days apartA file dialog shown while in full-screen mode could have resulted in the window remaining disabled.
    32Monitor
  • CVE-2026-109744476 days apartOther issue in the DOM: File component
    32Monitor
  • CVE-2024-9394266 days apartAn attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the `resource://devtools` origin.
    30Monitor
  • CVE-2024-11694210 days apartEnhanced Tracking Protection's Strict mode may have inadvertently allowed a CSP `frame-src` bypass and DOM-based XSS through the Google Safe
    24Monitor
  • CVE-2024-10461238 days apartIn multipart/x-mixed-replace responses, `Content-Disposition: attachment` in the response header was not respected and did not force a downl
    24Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

nvd-secondary

Root cause

User content is inserted into the page as HTML. The browser interprets the content as code rather than data.

The bug in code

The whole CWE-79 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
commentEl.innerHTML = comment.body;

Fixed

ts
commentEl.textContent = comment.body;

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records