Race condition in Mozilla Firefox
Priority LOW 26CWE-362Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Partial Red Hat: 14 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-862.
Summary
By using a form with a data URI it was possible to gain access to the privileged JSONView object that had been cloned into content. Impact from exposing this object appears to be minimal, however it was a bypass of existing defense in depth mechanisms. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.
Why it matters now
EPSS 0.00787 56th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 70Thunderbird (Mozilla): 68.2+1 more productRed Hat: 6 advisoriesRed Hat: 14 fixed, 1 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mozilla | Firefox | before 70 | 70 | Patch available | CNA |
| Mozilla | Thunderbird | before 68.2 | 68.2 | Patch available | CNA |
| Mozilla | Firefox ESR | before 68.2 | 68.2 | Patch available | CNA |
- Firefox VendorMozilla Affected before 70 Fixed in 70 Patch available CNA
- Thunderbird VendorMozilla Affected before 68.2 Fixed in 68.2 Patch available CNA
- Firefox ESR VendorMozilla Affected before 68.2 Fixed in 68.2 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 70.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* | before 68.2 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 68.2 | Vulnerable | Mozilla |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* | 16.04 | Vulnerable | Canonical |
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 70.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 68.2 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 68.2 Vulnerable ·Mozilla
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
Remediation
- Fix · CNA Firefox (Mozilla) Fixed in 70
- Fix · CNA Thunderbird (Mozilla) Fixed in 68.2
- Fix · CNA Firefox ESR (Mozilla) Fixed in 68.2
Red Hat 6 advisories
- RHSA-2019:3756 Released 2019-11-06 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Desktop (v. 6) thunderbird-68.2.0-2.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-68.2.0-2.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) thunderbird-68.2.0-2.el6_10
- RHSA-2019:3281 Released 2019-10-31 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Desktop (v. 6) firefox-68.2.0-4.el6_10
- Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-68.2.0-4.el6_10
- Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-68.2.0-4.el6_10
- Red Hat Enterprise Linux Server (v. 6) firefox-68.2.0-4.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) firefox-68.2.0-4.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) firefox-68.2.0-4.el6_10
- Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-68.2.0-4.el6_10
- RHSA-2019:3237 Released 2019-10-29 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-68.2.0-1.el8_0
Show 3 more Red Hat advisories
- RHSA-2019:3210 Released 2019-10-29 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-68.2.0-1.el7_7
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-68.2.0-1.el7_7
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-68.2.0-1.el7_7
- RHSA-2019:3193 Released 2019-10-24 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-68.2.0-1.el7_7
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-68.2.0-1.el7_7
- Red Hat Enterprise Linux Server (v. 7) firefox-68.2.0-1.el7_7
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-68.2.0-1.el7_7
- Red Hat Enterprise Linux Workstation (v. 7) firefox-68.2.0-1.el7_7
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-68.2.0-1.el7_7
- RHSA-2019:3196 Released 2019-10-24 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-68.2.0-2.el8_0
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2019:3196, RHSA-2019:3237 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2019:3193, RHSA-2019:3210 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2019:3193 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2019:3281, RHSA-2019:3756 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2019:3281 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2019:3281 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2019:3281 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2019:3193 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2019:3281, RHSA-2019:3756 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2019:3193, RHSA-2019:3210 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2019:3281, RHSA-2019:3756 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2019:3193, RHSA-2019:3210 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2019:3281 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2019:3193 |
Timeline
- 2026-10-02 Threatist record created from CVE-2019-11761
- 2026-10-03 Alias added: GHSA-44qm-5fqq-5hw7
References
More Mozilla Firefox vulnerabilities
- TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
- TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
- TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
- TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
- TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
- TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2019-11761 · CVE Program
- CVE-2019-11761 · NVD
- FIRST EPSS
- GHSA-44qm-5fqq-5hw7 · GitHub Advisory Database · CC BY 4.0
- CVE-2019-11761 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences