HOMEVULNERABILITIESCVE-2025-8031
CRITICAL

CVE-2025-8031

CWE-276Published: July 22, 2025· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2025-8031 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

Mozilla2 product(s)
firefoxthunderbird
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-56/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-58/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-59/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-61/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-62/
ADVISORYhttps://www.mozilla.org/security/advisories/mfsa2025-63/

All References (8)

→
https://bugzilla.mozilla.org/show_bug.cgi?id=1971719Permissions Required
→
https://www.mozilla.org/security/advisories/mfsa2025-56/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2025-58/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2025-59/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2025-61/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2025-62/Vendor Advisory
→
https://www.mozilla.org/security/advisories/mfsa2025-63/Vendor Advisory
→
https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html

Quick Facts

CVE IDCVE-2025-8031
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-276
CISA KEVNo
Affected1 vendor(s)
PublishedJul 22, 2025

Related CVEs (CWE-276)

CVE-2020-29492
10.0
CVE-2023-29131
10.0
CVE-2022-42150
10.0
CVE-2019-19896
9.9
CVE-2025-40585
9.9
CVE-2020-11716
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2025-8031 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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