CVE-2026-23760 (GCVE-0-2026-23760)

Vulnerability from cvelistv5 – Published: 2026-01-22 14:35 – Updated: 2026-08-04 03:56 X_Known Exploited Vulnerability
VLAI CISA Shadowserver Previdian
Title
SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API
Summary
SmarterTools SmarterMail versions prior to build 9511 contain an authentication bypass vulnerability in the password reset API. The force-reset-password endpoint permits anonymous requests and fails to verify the existing password or a reset token when resetting system administrator accounts. An unauthenticated attacker can supply a target administrator username and a new password to reset the account, resulting in full administrative compromise of the SmarterMail instance. NOTE: SmarterMail system administrator privileges grant the ability to execute operating system commands via built-in management functionality, effectively providing administrative (SYSTEM or root) access on the underlying host.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-22 00:00 UTC
CWE
  • CWE-288 - Authentication Bypass Using an Alternate Path or Channel
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7818 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
SmarterTools SmarterMail Affected: 0 , < 100.0.9511 (custom)
    cpe:2.3:a:smartertools:smartermail:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Piotr Bazydlo & Sina Kheirkhah of watchTowr Markus Wulftange of CODE WHITE GmbH
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: adddff13-de5b-496a-88b9-93bf52749bb3

Vulnerability ID: CVE-2026-23760

Status: Confirmed

Status Updated: 2026-01-26 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-01-26
Asserted: 2026-01-26
Scope
Notes: SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability | Affected: SmarterTools / SmarterMail | Description: SmarterTools SmarterMail contains an authentication bypass using an alternate path or channel vulnerability in the password reset API. The force-reset-password endpoint permits anonymous requests and fails to verify the existing password or a reset token when resetting system administrator accounts. This could allow an unauthenticated attacker to supply a target administrator username and a new password to reset the account, resulting in full administrative compromise of the SmarterMail instance. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-02-16 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://www.smartertools.com/smartermail/release-notes/current ; https://nvd.nist.gov/vuln/detail/CVE-2026-23760
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-288
Feed CISA Known Exploited Vulnerabilities Catalog
Product SmarterMail
Due Date 2026-02-16
Date Added 2026-01-26
Vendorproject SmarterTools
Vulnerabilityname SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability
Knownransomwarecampaignuse Known
References
Created: 2026-02-02 12:25 UTC | Updated: 2026-11-04 13:37 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8656282e-b328-410d-86e4-392b2c00279a

Vulnerability ID: CVE-2026-23760

Status: Confirmed

Status Updated: 2026-11-04 00:00 UTC

Exploited: Yes

Characteristics
Severity: 93.0
Timestamps
First Seen: 2026-01-25
Asserted: 2026-01-25
Last Seen: 2026-11-04
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: SmarterTools / SmarterMail | Class: email | Severity: Critical (CVSS 9.3) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-11-04: 469
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class email
7D Avg 0
Vendor SmarterTools
30D Avg 1
90D Avg 25
Product SmarterMail
Cisa Kev yes
Connections 469
Observation Date 2026-11-04
Vulnerability Class CVSS
Vulnerability Score 9.3
Vulnerability Severity Critical
References
Created: 2026-06-30 09:42 UTC | Updated: 2026-11-06 01:02 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b6703658-3cde-4c44-b68d-cbdb0b4e479a

Vulnerability ID: CVE-2026-23760

Status: Confirmed

Status Updated: 2026-06-01 10:49 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API | Affected: SmarterTools / SmarterMail | CVSS: 9.3 (CRITICAL) | EPSS: 0.96268 | Used in malware: yes | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Confirmed Compromise

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API
Vendor SmarterTools
Product SmarterMail
Added Date 2026-06-01T10:49:49.943Z
Cvss Score 9.3
Epss Score 0.96268
Cvss Severity CRITICAL
Epss Percentile 0.99872
Used In Malware yes
Ahead Of Cisa Kev 
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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                    "dateAdded": "2026-01-26",
                    "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-23760"
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            "title": "CISA ADP Vulnrichment"
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        "datePublished": "2026-01-22T14:35:17.235Z",
        "dateReserved": "2026-01-15T18:42:20.938Z",
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  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.