Medium severity · published Oct 27, 2026
CVE-2026-107145
Lack of rate-limiting in 2fa code check mechanism in twofactor_gauthenticator
New
6.3
CVSS
0.3%
EPSS
No
On KEV
Description
The twofactor_gauthenticator plugin for Roundcube is vulnerable to brute-forcing of the second-factor code. Due to the lack of rate limiting, an attacker who obtains user's password can submit arbitrary 6-digit codes, resulting in second-factor bypass and unauthorized access to the system.
This issue was fixed in commit 4640889.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TW
twofactor_gauthenticator · alexandregz
before 4640889 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107145
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107145
cert.pl
https://cert.pl/en/posts/2026/10/CVE-2026-107145
github.com
https://github.com/alexandregz/twofactor_gauthenticator/blob/master/CHANGES-2FA-SECURITY.en.md
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