Address bar spoofing via bidirectional characters
Priority LOW 31Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Partial Red Hat: 17 fixed, 2 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
An attacker could have created a malicious link using bidirectional characters to spoof the location in the address bar when visited. This vulnerability affects Firefox < 117, Firefox ESR < 115.4, and Thunderbird < 115.4.1.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01049 64th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 117Firefox ESR (Mozilla): 115.4+1 more productRed Hat: 13 advisoriesRed Hat: 17 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mozilla | Firefox | before 117 | 117 | Patch available | CNA |
| Mozilla | Firefox ESR | before 115.4 | 115.4 | Patch available | CNA |
| Mozilla | Thunderbird | before 115.4.1 | 115.4.1 | Patch available | CNA |
- Firefox VendorMozilla Affected before 117 Fixed in 117 Patch available CNA
- Firefox ESR VendorMozilla Affected before 115.4 Fixed in 115.4 Patch available CNA
- Thunderbird VendorMozilla Affected before 115.4.1 Fixed in 115.4.1 Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 117.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* | before 115.4.1 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 115.4.1 | Vulnerable | Mozilla |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 117.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 115.4.1 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 115.4.1 Vulnerable ·Mozilla
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
- Fix · CNA Firefox (Mozilla) Fixed in 117
- Fix · CNA Firefox ESR (Mozilla) Fixed in 115.4
- Fix · CNA Thunderbird (Mozilla) Fixed in 115.4.1
Red Hat 13 advisories
- RHSA-2023:6194 Released 2023-10-30 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-115.4.1-1.el8_8
- RHSA-2023:6195 Released 2023-10-30 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v.8.6) thunderbird-115.4.1-1.el8_6
- RHSA-2023:6196 Released 2023-10-30 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-115.4.1-1.el8_4
- Red Hat Enterprise Linux AppStream E4S (v.8.4) thunderbird-115.4.1-1.el8_4
- Red Hat Enterprise Linux AppStream TUS (v.8.4) thunderbird-115.4.1-1.el8_4
Show 10 more Red Hat advisories
- RHSA-2023:6199 Released 2023-10-30 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox-115.4.0-1.el9_0
- RHSA-2023:6197 Released 2023-10-30 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-115.4.1-1.el8_2
- Red Hat Enterprise Linux AppStream E4S (v. 8.2) thunderbird-115.4.1-1.el8_2
- Red Hat Enterprise Linux AppStream TUS (v. 8.2) thunderbird-115.4.1-1.el8_2
- RHSA-2023:6198 Released 2023-10-30 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird-115.4.1-1.el8_1
- RHSA-2023:6187 Released 2023-10-30 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-115.4.0-1.el8_8
- RHSA-2023:6191 Released 2023-10-30 · Red Hat rating Importantthunderbird security update
- Red Hat Enterprise Linux AppStream (v. 9) thunderbird-115.4.1-1.el9_2
- RHSA-2023:6189 Released 2023-10-30 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox-115.4.0-1.el8_1
- RHSA-2023:6186 Released 2023-10-30 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox-115.4.0-1.el8_6
- RHSA-2023:6188 Released 2023-10-30 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream (v. 9) firefox-115.4.0-1.el9_2, firefox-x11-115.4.0-1.el9_2
- RHSA-2023:6185 Released 2023-10-30 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-115.4.0-1.el8_2
- Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox-115.4.0-1.el8_2
- Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox-115.4.0-1.el8_2
- RHSA-2023:6162 Released 2023-10-30 · Red Hat rating Importantfirefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-115.4.0-1.el7_9
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-115.4.0-1.el7_9
- Red Hat Enterprise Linux Server (v. 7) firefox-115.4.0-1.el7_9
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-115.4.0-1.el7_9
- Red Hat Enterprise Linux Workstation (v. 7) firefox-115.4.0-1.el7_9
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-115.4.0-1.el7_9
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Mozilla Firefox ESR, Thunderbird 115.4, 115.4.1
8 records Highest priority Priority MEDIUM 3 MEDIUM, 5 LOW
Other records, highest priority first
- TI-2023-05273 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 52
- TI-2023-05271 Use after free in Mozilla FirefoxPriority MEDIUM 42
- TI-2023-05267 Uncontrolled resource consumption in Mozilla FirefoxPriority MEDIUM 42
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2023:6187, RHSA-2023:6194 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2023:6188, RHSA-2023:6191 |
| Red Hat Enterprise Linux AppStream AUS (v. 8.2) | Fixed | RHSA-2023:6185, RHSA-2023:6197 |
| Red Hat Enterprise Linux AppStream AUS (v.8.4) | Fixed | RHSA-2023:6196 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.1) | Fixed | RHSA-2023:6189, RHSA-2023:6198 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.2) | Fixed | RHSA-2023:6185, RHSA-2023:6197 |
| Red Hat Enterprise Linux AppStream E4S (v.8.4) | Fixed | RHSA-2023:6196 |
| Red Hat Enterprise Linux AppStream EUS (v.8.6) | Fixed | RHSA-2023:6186, RHSA-2023:6195 |
| Red Hat Enterprise Linux AppStream EUS (v.9.0) | Fixed | RHSA-2023:6199 |
| Red Hat Enterprise Linux AppStream TUS (v. 8.2) | Fixed | RHSA-2023:6185, RHSA-2023:6197 |
| Red Hat Enterprise Linux AppStream TUS (v.8.4) | Fixed | RHSA-2023:6196 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2023:6162 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2023:6162 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2023:6162 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2023:6162 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2023:6162 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2023:6162 |
Timeline
- 2026-10-02 Threatist record created from CVE-2023-5732
- 2026-10-03 Alias added: GHSA-p85h-gwrr-6mrj
References
Advisory 9
- https://bugzilla.mozilla.org/show_bug.cgi?id=1690979
- https://bugzilla.mozilla.org/show_bug.cgi?id=1836962
- https://lists.debian.org/debian-lts-announce/2023/10/msg00037.html
- https://lists.debian.org/debian-lts-announce/2023/10/msg00042.html
- https://www.debian.org/security/2023/dsa-5535
- https://www.debian.org/security/2023/dsa-5538
- https://www.mozilla.org/security/advisories/mfsa2023-34/
- https://www.mozilla.org/security/advisories/mfsa2023-46/
- https://www.mozilla.org/security/advisories/mfsa2023-47/
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-2023-5732 · CVE Program
- CVE-2023-5732 · NVD
- FIRST EPSS
- GHSA-p85h-gwrr-6mrj · GitHub Advisory Database · CC BY 4.0
- CVE-2023-5732 · 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