CVE-2025-1940
Mozilla Firefox ≤ 136.0
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:NSummary
CVE-2025-1940 is a high-severity Improper Restriction of Rendered UI Layers or Frames (CWE-1021) vulnerability in Mozilla Firefox. Its CVSS base score is 7.1 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Drive-by Compromise (T1189); ranked at the 15th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2025-1940 is a user interface vulnerability affecting only Android versions of Firefox, where a select option could partially obscure the confirmation prompt displayed before launching external applications. This flaw enables tricking users into unexpectedly launching an external app. Published on 2025-03-04, it is linked to CWE-1021 and carries a CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N).
A remote attacker with no privileges can exploit this over the network with low attack complexity by crafting content that positions a select element to hide critical parts of the confirmation dialog. Exploitation requires user interaction, such as the victim confirming an action they do not fully perceive. Success leads to the unintended launch of an external app, resulting in high confidentiality impact and low integrity impact.
Mozilla fixed this vulnerability in Firefox 136. Mitigation details are available in the Mozilla Foundation Security Advisory MFSA 2025-14 at https://www.mozilla.org/security/advisories/mfsa2025-14/ and the related Bugzilla entry at https://bugzilla.mozilla.org/show_bug.cgi?id=1908488.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-7442
Vulnerability Data
A select option could partially obscure the confirmation prompt shown before launching external apps. This could be used to trick a user in to launching an external app unexpectedly. *This issue only affects Android versions of Firefox.*. This vulnerability was…
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fixed in Firefox 136.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure SDLC practices directly require implementing frame-ancestors / X-Frame-Options controls that prevent this weakness.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing can detect missing frame protections, but does not itself implement the control.
Web filtering can block or sandbox untrusted frames, but does not enforce application-level frame-busting or CSP.
Application security requirements can mandate frame-ancestors / X-Frame-Options, directly addressing UI redressing risks.
Secure architecture principles include isolation of UI layers and proper use of browser security controls.
Secure coding practices directly require implementation of frame-busting headers or CSP frame-ancestors directives.