Octo Browser Medium severity

Octo Browser: user accounts accessed with known passwords, February 2026

On February 12, 2026, Octo Browser reported on its blog that attackers had logged into several users’ accounts and gained access to their profiles.

User account takeover

What happened

Company says the service was not hacked

On February 12, 2026, Octo Browser described an incident on its blog: attackers logged into several users’ accounts and accessed their profiles. According to the company, the logins succeeded on the first attempt, the affected users had not enabled two-factor authentication, and their data had appeared in leaks from industry websites. The company rules out a leak of passwords from its own database, as well as password guessing. It considers logins with passwords from third-party leaks unlikely, because one of the affected users had changed their password after the leak. The company identifies stealers on users’ devices as the most likely cause. It did not specify when the incident occurred, and its version has not been independently confirmed.

Who was affected

several accounts

Several users, according to the company. The exact number was not disclosed.

Losses

not reported

What the company did

It disclosed the incident itself on its blog and in its channels and urged users to enable 2FA and to set passwords on important profiles. On March 30, 2026, without directly linking the release to this incident, it released version 2.10.9 with additional checks for suspicious logins, email alerts for logins from new devices, and 2FA and email confirmation for critical actions.

Our editors collected and checked the sources; the text says who gives each figure.

Published October 10, 2026 Checked October 10, 2026

Company response or correction

Do you represent Octo Browser or have you spotted an inaccuracy? Send us a response or correction with a source link, and we’ll publish it in the “What the company did” section.

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How we count incidents. We count breaches and leaks on the service’s side, attacks through updates and extensions, account takeovers, and hacking attempts reported by the company itself. Brand impersonation, unverified complaints, patched vulnerabilities that were not exploited, DDoS attacks without data leaks, and account bans by platforms are not included in the incident count; they appear in the “Worth knowing” section. Checked October 10, 2026.