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Attackers have increasingly targeted the SmarterMail authentication bypass flaw CVE-2026-23760, a critical vulnerability with a CVSS v4 score of 9.3 that can let unauthenticated users gain administrator privileges. The issue was disclosed on January 22, and MBSD-SOC reported first seeing exploitation attempts on January 30, with activity continuing intermittently before rising sharply after April 23. Public proof-of-concept code is available, increasing the risk of opportunistic exploitation.
Observed attacks attempted to reset administrator credentials by sending a POST request to the /api/v1/auth/force-reset-password endpoint with the IsSysAdmin=true parameter, effectively seeking to take over the admin account. MBSD-SOC said many attack sources were geolocated to Japan. SmarterMail builds earlier than 9511 are affected, and organizations running exposed instances have been urged to update to the latest release and review systems for signs of unauthorized password resets or administrator account compromise.
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4 events from the most recent confirmed update back to the earliest known activity.
MBSD-SOC reported increased attacks during May 2026 targeting SmarterMail CVE-2026-23760. It advised organizations running affected builds earlier than 9511 to update to the latest version, noting that proof-of-concept code was already public.
After intermittent activity following the initial sightings, MBSD-SOC observed an increase in attacks targeting the SmarterMail flaw after April 23, 2026. The report also noted that many observed attack sources were geolocated to Japan.
MBSD-SOC reported first seeing attacks targeting CVE-2026-23760 on January 30, 2026. The observed pattern included a POST request to /api/v1/auth/force-reset-password using IsSysAdmin=true to try to reset the admin account password.
The SmarterMail authentication bypass vulnerability CVE-2026-23760 was publicly disclosed. Successful exploitation can let an attacker bypass authentication and obtain administrator privileges.
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Internet-wide scanning identified **6,000+ SmarterTools SmarterMail** servers exposed online and likely vulnerable to **CVE-2026-23760**, a **critical authentication bypass** in the password reset API that enables **unauthenticated admin account takeover** and can lead to **remote code execution**. The flaw affects SmarterMail versions prior to **build 9511** and abuses the `/api/v1/auth/force-reset-password` (aka `force-reset-password`) endpoint, which allows anonymous password resets for administrator accounts without validating the existing password or requiring a reset token. SmarterTools issued a fix on **January 15, 2026** (later assigned CVE-2026-23760), and Shadowserver reported large-scale exposure with thousands of instances flagged as “likely vulnerable,” including heavy concentration in North America and additional exposure in Asia. Multiple sources reported **active exploitation** shortly after patch availability, with observed attacker behavior consistent with automated hijacking: resetting admin credentials, obtaining authenticated access, and then leveraging SmarterMail administrative capabilities to execute OS-level commands. Huntress reported attackers creating malicious **System Events** to run reconnaissance commands and establish persistence, while watchTowr (which reported the issue to SmarterTools) received additional reports of exploitation in production environments. The reporting also notes this disclosure follows closely after another critical pre-auth SmarterMail issue (**CVE-2025-52691**), reinforcing that unpatched, internet-exposed SmarterMail deployments are being actively targeted.
Jun 29, 2026
SmarterTools *SmarterMail* patched a critical authentication bypass tracked as **WT-2026-0001** after researchers reported that attackers can reset the **system administrator** password without authentication by abusing the `/api/v1/auth/force-reset-password` endpoint. The flaw stems from logic in `SmarterMail.Web.Api.AuthenticationController.ForceResetPassword` that permits anonymous access and trusts a user-supplied boolean (`IsSysAdmin`); when set to `true`, the code path updates an admin account’s password without validating the old password or enforcing authorization checks. Both reporting indicate the issue is **actively exploited in the wild**, with observed exploitation occurring **within days of the vendor patch** (including reports of activity as soon as two days after release). Once an attacker resets the admin password, they can take over the mail server and leverage built-in administrative capabilities to execute OS commands, effectively achieving **remote code execution (RCE)** and full compromise of affected SmarterMail deployments; the patch was released as **Build 9511** following responsible disclosure by watchTowr Labs researchers **Piotr Bazydlo** and **Sina Kheirkhah**.
Jun 29, 2026
**watchTowr Labs** disclosed **WT-2026-0001**, an **authentication bypass** in *SmarterTools SmarterMail* that allows a user to reset the **system administrator password** via a password-reset mechanism and then leverage SmarterMail’s built-in “RCE-as-a-feature” capabilities to execute OS commands. The researcher reported the issue and stated it was patched quickly, citing a fixed release on **SmarterMail release 9511 (2026-01-15)**; the publication was accelerated after a tip that attackers were actively exploiting the flaw to reset admin passwords, with forum-shared logs reportedly showing suspicious activity tied to the `force-reset-password` endpoint. **Resecurity** reported exploitation of **CVE-2026-22794** in *Appsmith*, a critical authentication weakness in the password reset flow where the application trusts a **client-controlled `Origin` header** to build reset links. An attacker can initiate a reset for a victim while supplying a malicious Origin so the victim’s email contains a link to attacker infrastructure; when clicked, the reset token is exposed, enabling password change and **full account takeover**. Resecurity identified the affected endpoint as `/api/v1/users/forgotPassword`, stated **Appsmith ≤ 1.92** is affected, and that the issue is fixed in **Appsmith ≥ 1.93**.
Jun 29, 2026