CVE-2025-8031: mozilla firefox Incorrect Default Permissions
CVSS: 9.8v3.1CriticalModified
AliasesUBUNTU-CVE-2025-8031DEBIAN-CVE-2025-8031CGA-9w65-358q-3m8xCGA-c85m-g4c6-63jmCGA-ggm9-hm6p-r2mpCGA-wx9x-29rf-mm73
Published 22-07-2025Last modified 29-07-2026
Vulnerability summary
CVE-2025-8031 is a critical (CVSS 9.8) Incorrect Default Permissions vulnerability in mozilla firefox. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 41.1% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)EPSS score
0.49%
0%100%
Low · +0.05 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 37 · Related 12DLA-4250-1DLA-4253-1DSA-5964-1DSA-5966-1MGASA-2025-0227MGASA-2025-0228OPENSUSE-SU-2025-20135-1OPENSUSE-SU-2025:15371-1OPENSUSE-SU-2025:15383-1OPENSUSE-SU-2025:15386-1OPENSUSE-SU-2025:15387-1OPENSUSE-SU-2025:20135-1RHSA-2025:11747RHSA-2025:11748RHSA-2025:11797RHSA-2025:12044RHSA-2025:12045RHSA-2025:12046RHSA-2025:12187RHSA-2025:12188RHSA-2025:12278RHSA-2025:12302RHSA-2025:12353RHSA-2025:12360RHSA-2025:12361RHSA-2025:13645RHSA-2025:13646RHSA-2025:13647RHSA-2025:13648RHSA-2025:13649RHSA-2025:13650RHSA-2025:13651RHSA-2025:13676SUSE-SU-2025:02529-1SUSE-SU-2025:02531-1SUSE-SU-2025:02546-1SUSE-SU-2025:21170-1CGA-XR26-CVC4-H3V7USN-7991-1
Timeline
- 22-07-2025PublishedVulnerability first disclosed.
- 29-07-2026Last modifiedVulnerability information updated.
Description
The `username:password` part was not correctly stripped from URLs in CSP reports potentially leaking HTTP Basic Authentication credentials. This vulnerability was fixed in Firefox 141, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.
CVSS metrics
6 scores · 6 sources · 1 versionCritical 9.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 6 agree
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · WolfiEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · ChainguardEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.49%
Chance of exploitation in the next 30 days
Percentile
41%
Versus all other CVEs
30-day change
+0.05 pp
From 0.45% on 19-09-2026
19-09-202619-10-2026
EPSS score0.49%
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< 128.13-r0
- firefox-esr< 140.1-r0
Debian2 products
- firefox-esr< 128.13.0esr-1~deb12u1 | < 128.13.0esr-1
- thunderbird< 1:128.13.0esr-1~deb12u1 | < 1:128.13.0esr-1
Mozilla2 products
- firefox< 128.13.0 | < 141.0 | ≥ 140.0, < 140.1.0
- thunderbird< 128.13.0 | < 141.0 | ≥ 140.0, < 140.1.0
Wolfi1 product
- firefox< 128.13-r0
5 vendors · 15 products
