CVE-2018-12271
The LAContext class for Biometric (TouchID) validation allows authentication bypass by overriding the LAContext return Boolean value to be "true" because the kSecAccessControlUserPresence protection mechanism is not used.
Does this matter?
Lower severity and a low EPSS score (0.42%). Track it; it rarely justifies an emergency change on its own.
Description
An issue was discovered in the com.getdropbox.Dropbox app 100.2 for iOS. The LAContext class for Biometric (TouchID) validation allows authentication bypass by overriding the LAContext return Boolean value to be "true" because the kSecAccessControlUserPresence protection mechanism is not used. In other words, an attacker could authenticate with an arbitrary fingerprint. NOTE: the vendor indicates that this is not an attack of interest within the context of their threat model, which excludes iOS devices on which a jailbreak has occurred
- CVSS 3.0
- 6.4 MEDIUMCVSS:3.0/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.42% probability · 37th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- dropbox/dropbox
- Source
- cve@mitre.org
EPSS 0.4% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://gist.github.com/tanprathan/6e8ed195a2e05b7f9d9a342dbdacb349Issue Tracking, Third Party Advisory, Tool Signature
- https://hackerone.com/reports/363544Issue Tracking, Third Party Advisory
- https://www.dropbox.com/s/n880ob3gtvfwryu/20180609_013320.mp4?dl=0Broken Link, Permissions Required
- https://gist.github.com/tanprathan/6e8ed195a2e05b7f9d9a342dbdacb349Issue Tracking, Third Party Advisory, Tool Signature
- https://hackerone.com/reports/363544Issue Tracking, Third Party Advisory
- https://www.dropbox.com/s/n880ob3gtvfwryu/20180609_013320.mp4?dl=0Broken Link, Permissions Required
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.