Security readout for executives and security teams
Plain-English summary
A flaw in Firefox and Thunderbird could let a website bypass browser cross-origin protections by changing the IP address behind a domain. Successful abuse requires user interaction but could expose or alter sensitive data accessible through the application. Mozilla rates the underlying issue as high severity and released corrected versions.
Executive priority
Treat this as a prompt, high-priority browser and mail-client update. It can affect data confidentiality and integrity without requiring attacker credentials, although user interaction is necessary and active exploitation is not established. Focus first on endpoints used to access sensitive business or administrative resources.
Technical view
CORS preflight results were cached across DNS-driven IP address changes. An attacker could combine that behavior with DNS rebinding to reuse an earlier authorization decision after the destination changed. The supplied CVSS 3.1 score is 8.1: network-accessible, low complexity, no privileges, user interaction required, with high confidentiality and integrity impact but no availability impact.
Likely exposure
Exposure exists where Firefox, Firefox ESR, or Thunderbird remains below the applicable corrected release: Firefox 141, Firefox ESR 140.1, Thunderbird 141, or Thunderbird 140.1. Exact exposure requires checking installed product channels and versions. The bundle inconsistently lists corrected versions under affected versions, so Mozilla advisories should govern inventory decisions.
Exploitation context
The bundle does not establish active exploitation, and the CVE is not listed as KEV. Exploitation is remotely initiated and low complexity but requires user interaction. DNS rebinding is used to change the resolved destination while a cached CORS preflight decision remains valid. No conclusion about exploitation in the wild should be drawn from the supplied evidence.
Researcher notes
CWE-350 applies because security behavior depended on IP-address resolution changes. The important boundary is whether cached preflight authorization survives rebinding. The bundle's affected-version entries conflict with its statement that 140.1 and 141 are fixed; validate version interpretation against the product-specific Mozilla advisories. The supplied sources do not describe public exploitation or a workaround beyond corrected releases.
Mitigation direction
- Update Firefox to 141 or Firefox ESR to 140.1, as applicable.
- Update Thunderbird to 141 or 140.1, according to the deployed release channel.
- Prioritize endpoints whose users access sensitive web resources.
- Review Mozilla advisories for newer supported releases or additional vendor guidance.
Validation and detection
- Inventory installed Firefox, Firefox ESR, and Thunderbird versions and release channels.
- Confirm every installation meets or exceeds its applicable corrected version.
- Verify managed update systems successfully deployed the corrected releases.
- Review exception and unsupported-software inventories for remaining vulnerable installations.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-350: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-8036 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N2.85.2CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.mozilla.org/show_bug.cgi?id=1960834CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2025-56/CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2025-59/CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2025-61/CVE reference, mozilla
- https://www.mozilla.org/security/advisories/mfsa2025-63/CVE reference, mozilla
- https://www.kb.cert.org/vuls/id/652514CVE reference, CVE
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Reliance on Reverse DNS Resolution for a Security-Critical Action
Reliance on Reverse DNS Resolution for a Security-Critical Action represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.