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TI-2023-09431 Aliases CVE-2023-23602GHSA-457f-c77p-7wc3

Content Security Policy wasn't being correctly applied to WebSockets in WebWorkers

Priority MEDIUM 62CWE-754Published · 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: 15 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

Summary

A mishandled security check when creating a WebSocket in a WebWorker caused the Content Security Policy connect-src header to be ignored. This could lead to connections to restricted origins from inside WebWorkers. This vulnerability affects Firefox < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00601 49th percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 109Firefox ESR (Mozilla): 102.7+1 more productRed Hat: 16 advisoriesRed Hat: 15 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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

VendorProductAffected versionsFixed inStatusSource
MozillaFirefoxbefore 109109Patch availableCNA
MozillaFirefox ESRbefore 102.7102.7Patch availableCNA
MozillaThunderbirdbefore 102.7102.7Patch availableCNA
  • Firefox VendorMozilla Affected before 109 Fixed in 109 Patch available CNA
  • Firefox ESR VendorMozilla Affected before 102.7 Fixed in 102.7 Patch available CNA
  • Thunderbird VendorMozilla Affected before 102.7 Fixed in 102.7 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 109.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*before 102.7VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 102.7VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 109.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 102.7 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 102.7 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 109
  • Fix · CNA Firefox ESR (Mozilla) Fixed in 102.7
  • Fix · CNA Thunderbird (Mozilla) Fixed in 102.7

Red Hat 16 advisories

  • RHSA-2023:0476 Released 2023-01-26 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 9) thunderbird-102.7.1-1.el9_1
  • RHSA-2023:0463 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream (v. 8) thunderbird-102.7.1-1.el8_7
  • RHSA-2023:0462 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.6) thunderbird-102.7.1-1.el8_6
Show 13 more Red Hat advisories
  • RHSA-2023:0456 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-102.7.1-1.el7_9
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-102.7.1-1.el7_9
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-102.7.1-1.el7_9
  • RHSA-2023:0460 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.4) thunderbird-102.7.1-1.el8_4
  • RHSA-2023:0461 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.0) thunderbird-102.7.1-1.el9_0
  • RHSA-2023:0459 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-102.7.1-1.el8_2
    • Red Hat Enterprise Linux AppStream E4S (v. 8.2) thunderbird-102.7.1-1.el8_2
    • Red Hat Enterprise Linux AppStream TUS (v. 8.2) thunderbird-102.7.1-1.el8_2
  • RHSA-2023:0457 Released 2023-01-25 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird-102.7.1-1.el8_1
  • RHSA-2023:0289 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox-102.7.0-1.el8_6
  • RHSA-2023:0294 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-102.7.0-1.el8_2
    • Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox-102.7.0-1.el8_2
    • Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox-102.7.0-1.el8_2
  • RHSA-2023:0290 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox-102.7.0-1.el8_1
  • RHSA-2023:0296 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux Client (v. 7) firefox-102.7.0-1.el7_9
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-102.7.0-1.el7_9
    • Red Hat Enterprise Linux Server (v. 7) firefox-102.7.0-1.el7_9
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-102.7.0-1.el7_9
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-102.7.0-1.el7_9
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-102.7.0-1.el7_9
  • RHSA-2023:0295 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox-102.7.0-1.el8_4
  • RHSA-2023:0288 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 8) firefox-102.7.0-1.el8_7
  • RHSA-2023:0286 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox-102.7.0-1.el9_0
  • RHSA-2023:0285 Released 2023-01-23 · Red Hat rating Important
    firefox security update
    • Red Hat Enterprise Linux AppStream (v. 9) firefox-102.7.0-1.el9_1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mozilla Firefox 109

    10 records Highest priority Priority MEDIUM 3 MEDIUM, 7 LOW

    Other records, highest priority first

    • TI-2023-09435 Memory safety bugs fixed in Firefox 109Priority MEDIUM 41
    • TI-2023-09434 Memory safety bugs fixed in Firefox 109 and Firefox ESR 102.7Priority MEDIUM 41
    • TI-2023-09432 Calls to console.log allowed bypassing Content Security Policy via format directivePriority LOW 30
    Show all 10 records →
  • Release ·

    Mozilla Firefox ESR, Thunderbird 102.7

    6 records Highest priority Priority MEDIUM 2 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2023-09434 Memory safety bugs fixed in Firefox 109 and Firefox ESR 102.7Priority MEDIUM 41
    • TI-2023-09432 Calls to console.log allowed bypassing Content Security Policy via format directivePriority LOW 30
    • TI-2023-09428 Malicious command could be hidden in devtools output on WindowsPriority LOW 30
    Show all 6 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2023:0288, RHSA-2023:0463
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2023:0285, RHSA-2023:0476
Red Hat Enterprise Linux AppStream AUS (v. 8.2)Fixed RHSA-2023:0294, RHSA-2023:0459
Red Hat Enterprise Linux AppStream E4S (v. 8.1)Fixed RHSA-2023:0290, RHSA-2023:0457
Red Hat Enterprise Linux AppStream E4S (v. 8.2)Fixed RHSA-2023:0294, RHSA-2023:0459
Red Hat Enterprise Linux AppStream EUS (v.8.4)Fixed RHSA-2023:0295, RHSA-2023:0460
Red Hat Enterprise Linux AppStream EUS (v.8.6)Fixed RHSA-2023:0289, RHSA-2023:0462
Red Hat Enterprise Linux AppStream EUS (v.9.0)Fixed RHSA-2023:0286, RHSA-2023:0461
Red Hat Enterprise Linux AppStream TUS (v. 8.2)Fixed RHSA-2023:0294, RHSA-2023:0459
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2023:0296, RHSA-2023:0456
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2023:0296
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2023:0296
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2023:0296, RHSA-2023:0456
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2023:0296, RHSA-2023:0456
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2023:0296

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-23602
  2. 2026-10-03 Alias added: GHSA-457f-c77p-7wc3

References

Advisory 4

  • 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
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences