CVE-2022-40956: mozilla firefox Cross-site Scripting
CVSS: 6.1v3.1MediumModified
AliasesUBUNTU-CVE-2022-40956DEBIAN-CVE-2022-40956
Published 22-12-2022Last modified 15-04-2025
Vulnerability summary
CVE-2022-40956 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in mozilla firefox. EPSS estimates a 0.91% chance of exploitation in the next 30 days, higher than 59.2% of scored vulnerabilities.
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)EPSS score
0.91%
0%100%
Low · +0.03 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 27 · Related 9DLA-3121-1DLA-3123-1DSA-5237-1DSA-5238-1MGASA-2022-0344MGASA-2022-0347OPENSUSE-SU-2024:12358-1OPENSUSE-SU-2024:12398-1OPENSUSE-SU-2024:14572-1RHSA-2022:6700RHSA-2022:6701RHSA-2022:6702RHSA-2022:6703RHSA-2022:6707RHSA-2022:6708RHSA-2022:6710RHSA-2022:6711RHSA-2022:6713RHSA-2022:6715RHSA-2022:6716RHSA-2022:6717SUSE-SU-2022:3396-1SUSE-SU-2022:3440-1SUSE-SU-2022:3441-1SUSE-SU-2022:3800-1USN-5649-1USN-5724-1
Timeline
- 22-12-2022PublishedVulnerability first disclosed.
- 15-04-2025Last modifiedVulnerability information updated.
Description
When injecting an HTML base element, some requests would ignore the CSP's base-uri settings and accept the injected element's base instead. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 6.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- NVDNIST6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
0.91%
Chance of exploitation in the next 30 days
Percentile
59%
Versus all other CVEs
30-day change
+0.03 pp
From 0.88% on 19-09-2026
19-09-202619-10-2026
EPSS score0.91%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Mozilla3 products
- firefox≥ unspecified, < 105 | < 105.0
- firefox_esr≥ unspecified, < 102.3 | < 102.3
- thunderbird≥ unspecified, < 102.3 | < 102.3
Debian2 products
- firefox-esr< 102.3.0esr-1
- thunderbird< 1:102.3.0-1
Ubuntu2 products
- firefox< 105.0+build2-0ubuntu0.18.04.1 | < 105.0+build2-0ubuntu0.20.04.1
- thunderbird< 1:102.4.2+build2-0ubuntu0.18.04.1 | < 1:102.4.2+build2-0ubuntu0.20.04.1 | < 1:102.4.2+build2-0ubuntu0.22.04.1
3 vendors · 7 products
References
12 links- www.mozilla.org/security/advisories/mfsa2022-40/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2022-41/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2022-42/Vendor Advisory
