CVE-2023-23603: mozilla firefox
CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2023-23603DEBIAN-CVE-2023-23603
Published 02-06-2023Last modified 18-12-2025
Vulnerability summary
CVE-2023-23603 is a medium (CVSS 6.5) vulnerability in mozilla firefox. EPSS estimates a 0.64% chance of exploitation in the next 30 days, higher than 49.6% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)EPSS score
0.64%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 32 · Related 10DLA-3275-1DLA-3324-1DSA-5322-1DSA-5355-1MGASA-2023-0018MGASA-2023-0034OPENSUSE-SU-2024:12623-1OPENSUSE-SU-2024:12627-1OPENSUSE-SU-2024:12652-1OPENSUSE-SU-2024:14572-1RHSA-2023:0285RHSA-2023:0286RHSA-2023:0288RHSA-2023:0289RHSA-2023:0290RHSA-2023:0294RHSA-2023:0295RHSA-2023:0296RHSA-2023:0456RHSA-2023:0457RHSA-2023:0459RHSA-2023:0460RHSA-2023:0461RHSA-2023:0462RHSA-2023:0463RHSA-2023:0476SUSE-SU-2023:0111-1SUSE-SU-2023:0112-1SUSE-SU-2023:0113-1SUSE-SU-2023:0329-1USN-5816-1USN-5824-1
Timeline
- 02-06-2023PublishedVulnerability first disclosed.
- 18-12-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 6.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:NSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- OSV · DebianEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- NVDNIST6.5MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
EPSS trend
Probability
0.64%
Chance of exploitation in the next 30 days
Percentile
50%
Versus all other CVEs
30-day change
0.00 pp
From 0.64% on 18-09-2026
18-09-202618-10-2026
EPSS score0.64%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu7 products
- firefox< 109.0+build2-0ubuntu0.18.04.1 | < 109.0+build2-0ubuntu0.20.04.1
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
- mozjs78All versions (No fix recorded)
Mozilla3 products
- firefox≥ unspecified, < 109 | < 109.0
- firefox_esr≥ unspecified, < 102.7 | < 102.7
- thunderbird≥ unspecified, < 102.7 | < 102.7
Debian2 products
- firefox-esr< 102.7.0esr-1
- thunderbird< 1:102.7.1-1
3 vendors · 12 products
References
11 links- www.mozilla.org/security/advisories/mfsa2023-01/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2023-02/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2023-03/Vendor Advisory
