CVE-2023-23603

Name: CVE-2023-23603
Creator: NVD / NIST
Published: 2023-06-02T17:15:10.823+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.64%

Last modified Jun 17, 2026

CVE-2023-23603 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Regular expressions used to filter out forbidden properties and values from style directives in calls to `console.log` weren't accounting for external URLs. Data could then be potentially exfiltrated from the browser. EPSS estimates a 0.64% chance of exploitation in the next 30 days.

Description

Regular expressions used to filter out forbidden properties and values from style directives in calls to `console.log` weren't accounting for external URLs. Data could then be potentially exfiltrated from the browser. This vulnerability affects Firefox < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS Probability

0.64%

46.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 109.0
Mozilla	Firefox Esr	< 102.7
Mozilla	Thunderbird	< 102.7

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1800832Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-01/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-02/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-03/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1800832Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-01/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-02/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-03/Vendor Advisory

Timeline

Published: Jun 2, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-23603?

How severe is CVE-2023-23603?

CVE-2023-23603 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.64% probability of exploitation in the next 30 days.

How do I fix CVE-2023-23603?

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.

Are you affected by CVE-2023-23603?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST