Mozilla Firefox up to 140.12/152 HTTP isolation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.0$5k-$25k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox up to 140.12/152 and classified as critical. Affected is an unknown function of the component HTTP. The manipulation results in isolation. This vulnerability is cataloged as CVE-2026-16375. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 140.12/152. Affected is an unknown code of the component HTTP. The manipulation with an unknown input leads to a isolation vulnerability. CWE is classifying the issue as CWE-653. The product does not properly compartmentalize or isolate functionality, processes, or resources that require different privilege levels, rights, or permissions. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Site isolation issue in the Networking: HTTP component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.

The advisory is available at bugzilla.mozilla.org. This vulnerability is traded as CVE-2026-16375 since 07/20/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/05/2026).

The vulnerability scanner Nessus provides a plugin with the ID 331937 (RHEL 8 : thunderbird (RHSA-2026:49922)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 140.13 or 153 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (331937). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Vendor

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Isolation
CWE: CWE-653
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 331937
Nessus Name: RHEL 8 : thunderbird (RHSA-2026:49922)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Firefox 140.13/153

Timelineinfo

07/20/2026 CVE reserved
07/21/2026 +1 days Advisory disclosed
07/21/2026 +0 days VulDB entry created
08/05/2026 +15 days VulDB entry last update

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: bugzilla.mozilla.org
Status: Confirmed

CVE: CVE-2026-16375 (🔒)
GCVE (CVE): GCVE-0-2026-16375
GCVE (VulDB): GCVE-100-380874

Entryinfo

Created: 07/21/2026 15:31
Updated: 08/05/2026 03:41
Changes: 07/21/2026 15:31 (54), 08/05/2026 03:41 (5)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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