CVE-2026-2790
CRITICALCVSS 9.8/10EPSS 0.23%
Last modified
CVE-2026-2790 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.. EPSS estimates a 0.23% chance of exploitation in the next 30 days.
Description
Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 140.8.0 |
| Mozilla | Firefox | < 148.0 |
| Mozilla | Thunderbird | < 140.8.0 |
| Mozilla | Thunderbird | < 148.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2008426Issue Tracking, Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-13/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-15/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-16/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-17/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-2790?
Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
How severe is CVE-2026-2790?
CVE-2026-2790 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.
How do I fix CVE-2026-2790?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-27894LDAP Account Manager (LAM) is a webfrontend for managing ent…8.8
- CVE-2026-27895LDAP Account Manager (LAM) is a webfrontend for managing ent…8.8
- CVE-2026-27896The Go MCP SDK used Go's standard encoding/json.Unmarshal fo…7.5
- CVE-2026-27897Vociferous provides cross-platform, offline speech-to-text w…7.1
- CVE-2026-27898Vaultwarden is an unofficial Bitwarden compatible server wri…5.4
- CVE-2026-27899WireGuard Portal (or wg-portal) is a web-based configuration…8.8
- CVE-2026-27900The Terraform Provider for Linode versions prior to v3.9.0 l…7.7
- CVE-2026-27901Svelte performance oriented web framework. Prior to version …6.1
- CVE-2026-27902Svelte performance oriented web framework. Prior to version …5.4
- CVE-2026-27903minimatch is a minimal matching utility for converting glob …7.5
- CVE-2026-27904minimatch is a minimal matching utility for converting glob …7.5
- CVE-2026-27905BentoML is a Python library for building online serving syst…7.8
Are you affected by CVE-2026-2790?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST