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NVD / CVE Program· CNA mozilla

CVE-2025-11712: An OBJECT tag type attribute overrode browser behavior on web resources without a content-type

MediumCVSS 6.1 · v3.1—No exploit Fix available

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: 0.22% (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) 140.4.0-3.el10_0; thunderbird (AlmaLinux:10) 140.4.0-2.el10_0.alma.1; firefox (AlmaLinux:8) 140.4.0-3.el8_10.alma.1.

Low priority for now. Upgrade to firefox (AlmaLinux:10) 140.4.0-3.el10_0; thunderbird (AlmaLinux:10) 140.4.0-2.el10_0.alma.1; firefox (AlmaLinux:8) 140.4.0-3.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

A malicious page could have used the type attribute of an OBJECT tag to override the default browser behavior when encountering a web resource served without a content-type. This could have contributed to an XSS on a site that unsafely serves files without a content-type header. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.

Published
Oct 14, 2025
Updated
Oct 23, 2026
EPSS
0.2% · 12th 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-2025-11712

When you'll hear from us

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  • when exploit code appears or is weaponized
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  • 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
mozillathunderbird

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

    • 140.4 and later · up to and including 140.*not affected · rpm
    • 144 and laternot affected · rpm

  • Mozilla Thunderbird

    • 140.4 and later · up to and including 140.*not affected · rpm
    • 144 and laternot affected · rpm
Affected versions · NVD (4)

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

  • mozilla firefoxbefore 140.4.0
  • mozilla firefoxbefore 144.0
  • mozilla thunderbirdbefore 140.4.0
  • mozilla thunderbird141.0 and later · before 144.0

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10firefoxbefore 140.4.0-3.el10_0140.4.0-3.el10_0
AlmaLinux:10thunderbirdbefore 140.4.0-2.el10_0.alma.1140.4.0-2.el10_0.alma.1
AlmaLinux:8firefoxbefore 140.4.0-3.el8_10.alma.1140.4.0-3.el8_10.alma.1
AlmaLinux:8thunderbirdbefore 140.4.0-2.el8_10.alma.1140.4.0-2.el8_10.alma.1
AlmaLinux:9firefoxbefore 140.4.0-3.el9_6.alma.1140.4.0-3.el9_6.alma.1
AlmaLinux:9firefox-x11before 140.4.0-3.el9_6.alma.1140.4.0-3.el9_6.alma.1
AlmaLinux:9thunderbirdbefore 140.4.0-2.el9_6.alma.1140.4.0-2.el9_6.alma.1
Debian:11firefox-esrbefore 140.4.0esr-1~deb11u1140.4.0esr-1~deb11u1
Debian:11thunderbirdbefore 1:140.4.0esr-1~deb11u11:140.4.0esr-1~deb11u1
Debian:12firefox-esrbefore 140.4.0esr-1~deb12u1140.4.0esr-1~deb12u1
Debian:12thunderbirdbefore 1:140.4.0esr-1~deb12u11:140.4.0esr-1~deb12u1
Debian:13firefox-esrbefore 140.4.0esr-1~deb13u1140.4.0esr-1~deb13u1
Debian:13thunderbirdbefore 1:140.4.0esr-1~deb13u11:140.4.0esr-1~deb13u1
Debian:14firefox-esrbefore 140.4.0esr-1140.4.0esr-1
Debian:14thunderbirdbefore 1:140.4.0esr-11:140.4.0esr-1
openSUSE:Leap 15.6MozillaFirefoxbefore 140.4.0-150200.152.207.1140.4.0-150200.152.207.1
openSUSE:Leap 15.6MozillaFirefoxbefore 140.5.0-150200.152.210.1140.5.0-150200.152.210.1
openSUSE:Leap 15.6MozillaThunderbirdbefore 140.4.0-150200.8.242.1140.4.0-150200.8.242.1
openSUSE:Leap 16.0MozillaFirefoxbefore 140.5.0-160000.1.1140.5.0-160000.1.1
openSUSE:Leap 16.0MozillaThunderbirdbefore 140.4.0-bp160.1.1140.4.0-bp160.1.1
openSUSE:Tumbleweedfirefox-esrbefore 140.4.0-1.1140.4.0-1.1
openSUSE:TumbleweedMozillaFirefoxbefore 144.0-1.1144.0-1.1
openSUSE:TumbleweedMozillaThunderbirdbefore 140.4.0-1.1140.4.0-1.1
Red Hat:enterprise_linux:10.0firefoxbefore 0:140.4.0-3.el10_00:140.4.0-3.el10_0

+76

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…KEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the…KEV
    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…KEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-11710Oct 14, 2025 · Cross-process information leaked due to malicious IPC messages
    39Monitor
  • ← EarlierCVE-2025-11711Oct 14, 2025 · Some non-writable Object properties could be modified
    26Monitor
  • Later →CVE-2025-11713Oct 14, 2025 · Potential user-assisted code execution in “Copy as cURL” command
    32Monitor

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:firefox140.4.0-3.el10_0 · AlmaLinux:10Package registry (OSV)
almalinux:firefox-x11140.4.0-3.el9_6.alma.1 · AlmaLinux:9Package registry (OSV)
almalinux:thunderbird140.4.0-2.el10_0.alma.1 · AlmaLinux:10Package registry (OSV)
debian:firefox-esr140.4.0esr-1~deb12u1 · Debian:12Package registry (OSV)
debian:thunderbird1:140.4.0esr-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:firefox-esr140.4.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:MozillaFirefox140.4.0-150200.152.207.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:MozillaThunderbird140.4.0-150200.8.242.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:firefox0:140.4.0-3.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:firefox-debuginfo0:140.4.0-3.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:firefox-debugsource0:140.4.0-3.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:firefox-x110:140.4.0-3.el9_6 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird0:140.4.0-2.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:thunderbird-debuginfo0:140.4.0-2.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:thunderbird-debugsource0:140.4.0-2.el10_0 · Red Hat:enterprise_linux:10.0Package registry (OSV)
rocky linux:firefox0:140.4.0-3.el10_0 · Rocky Linux:10Package registry (OSV)
rocky linux:thunderbird0:140.4.0-2.el10_0 · Rocky Linux:10Package registry (OSV)
suse:MozillaFirefox140.4.0-150200.152.207.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP6Package registry (OSV)
suse:MozillaFirefox140.5.0-160000.1.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:MozillaThunderbird140.4.0-150200.8.242.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP6Package 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.

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-2025-117130 days apartPotential user-assisted code execution in “Copy as cURL” command
    32Monitor
  • CVE-2025-6429112 days apartIncorrect parsing of URLs could have allowed embedding of youtube.com
    26Monitor
  • CVE-2025-5271140 days apartDevtools' preview ignored CSP headers
    26Monitor
  • CVE-2025-4084168 days apartPotential local code execution in "copy as cURL" command
    22Monitor

Not on record for this CVE: EPSS history · patch commit or PR link · public bounty program.

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-116 · Improper Encoding or Escaping of Output

CVSS vector

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

nvd-secondary

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

—

References

Show all references (6 more)

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

All records