Medium severity · published Jun 1, 2026
CVE-2026-45153
Nextcloud: PIN bypass in PassCodeActivity via back button
4.6
CVSS
0.2%
EPSS
No
On KEV
Description
Nextcloud is an open source content collaboration platform. From version 33.0.0 to before version 33.1.0, after unlocking a locked Android phone the back-button could be used to bypass the Nextcloud Files app PIN. This issue has been patched in version 33.1.0.
CVSS vector
CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
Attack vector
Physical
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-advisories · nextcloud
>= 33.0.0, < 33.1.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-45153
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-45153
github.com
https://github.com/nextcloud/android/pull/16896
github.com
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-2w7v-5299-3hw5
hackerone.com
https://hackerone.com/reports/3625210
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