CVE-2025-5263: mozilla firefox Origin Validation Error
CVSS: 4.3v3.1MediumModified
AliasesUBUNTU-CVE-2025-5263DEBIAN-CVE-2025-5263CGA-wh72-7cqg-7g3qCGA-x649-q88m-3mx7CGA-5j96-4vqr-fv9hCGA-cpgq-89hp-6567
Published 27-05-2025Last modified 13-04-2026
Vulnerability summary
CVE-2025-5263 is a medium (CVSS 4.3) Origin Validation Error vulnerability in mozilla firefox. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15% of scored vulnerabilities.
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)EPSS score
0.25%
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 38 · Related 12DLA-4191-1DLA-4194-1DSA-5926-1DSA-5932-1MGASA-2025-0195MGASA-2025-0197OPENSUSE-SU-2025-20135-1OPENSUSE-SU-2025:15170-1OPENSUSE-SU-2025:15174-1OPENSUSE-SU-2025:15196-1OPENSUSE-SU-2025:15315-1OPENSUSE-SU-2025:20135-1RHSA-2025:8293RHSA-2025:8308RHSA-2025:8341RHSA-2025:8598RHSA-2025:8599RHSA-2025:8607RHSA-2025:8608RHSA-2025:8628RHSA-2025:8629RHSA-2025:8630RHSA-2025:8631RHSA-2025:8642RHSA-2025:8756RHSA-2025:9071RHSA-2025:9072RHSA-2025:9073RHSA-2025:9074RHSA-2025:9075RHSA-2025:9076RHSA-2025:9077RHSA-2025:9155SUSE-SU-2025:01769-1SUSE-SU-2025:01814-1SUSE-SU-2025:01946-1SUSE-SU-2025:21170-1USN-7663-1CGA-9QXC-WW45-2857
Timeline
- 27-05-2025PublishedVulnerability first disclosed.
- 13-04-2026Last modifiedVulnerability information updated.
Description
Error handling for script execution was incorrectly isolated from web content, which could have allowed cross-origin leak attacks. This vulnerability was fixed in Firefox 139, Firefox ESR 115.24, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
CVSS metrics
6 scores · 6 sources · 1 versionMedium 4.3Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:NSourcesAll 6 agree
- OSV · UbuntuEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- OSV · DebianEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- OSV · WolfiEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- OSV · ChainguardEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- NVDNIST4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
EPSS trend
Probability
0.25%
Chance of exploitation in the next 30 days
Percentile
15%
Versus all other CVEs
30-day change
0.00 pp
From 0.25% on 19-09-2026
19-09-202619-10-2026
EPSS score0.25%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu8 products
- mozjs102All versions (No fix recorded)
- mozjs115All versions (No fix recorded)
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
Chainguard2 products
- firefox< 139-r0
- firefox-esr< 139-r0
Debian2 products
- firefox-esr< 128.11.0esr-1~deb12u1 | < 128.11.0esr-1
- thunderbird< 1:128.11.0esr-1~deb12u1 | < 1:128.11.0esr-1
Mozilla1 product
- firefox< 115.24.0 | < 139.0 | ≥ 116.0, < 128.11.0
Wolfi1 product
- firefox< 139-r0
5 vendors · 14 products
