CASCACascade Atlas

Evidence dossier

CVE-2026-23760

SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API

Exploited in the wild (CISA KEV since Jan 26, 2026). VulnCheck reports CVSS 4.0 9.3. EPSS estimates 96.4% exploit likelihood as of Oct 21, 2026.

82.9–87.1Priority evidence range
Evidence through Oct 22, 2026, 6:07 PM UTC

As of Oct 22, 2026

Normalized restatement

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.

State
PUBLISHED
Published
Jan 22, 2026
Updated
Aug 4, 2026
Evidence coverage
85%

Evidence chronology

What was known when

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  1. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    VulnCheck

    Record text: SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API

    Inspect raw assertion
    Field
    container
    Value
    SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API
    Original evidence ↗
  3. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 96.43% probability · 99.88th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.964320000000; percentile 0.998830000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Jan 26, 2026 · first observed Sep 1, 2026

Exploit likelihood96.43%

FIRST EPSS · score date Oct 21, 2026 · 99.9th percentile · first observed Oct 21, 2026

SeverityCVSS 9.3

VulnCheck · CVSS 4.0 · first observed Aug 4, 2026 · same-version scores align in this snapshot

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1
Exploitation statusLast verified source snapshot retained

The last verified source boundary remains in force for this claim.

Revision
evidence-policy-v1.1.0
Cutoff
Oct 22, 2026
Resolution
Review source contract
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Oct 22, 2026
Resolution
None
Severity assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Oct 22, 2026
Resolution
None
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Oct 22, 2026
Resolution
Resolve identity

Source comparison

Who said what

CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
VulnCheckOriginal assertion
Record text

SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API

Inspect raw assertion
Field
container
Value
SmarterTools SmarterMail < Build 9511 Authentication Bypass via Password Reset API
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
SmarterTools SmarterMail Authentication Bypass Using an Alternate Path or Channel Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

96.43% probability · 99.88th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.964320000000; percentile 0.998830000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
1Underlying assertions
1Canonical products
1Target assertions
0Constraint assertions

Grouped from 1 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

2 scope groups

VulnCheck · source assertedSmarterToolsSmarterMailDirect source scope
Affected: 0 to before 100.0.9511 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "0", "lessThan": "100.0.9511", "versionType": "custom"}]
NVD CPE · APPLICATIONsmartertoolssmartermailVulnerable target · 1 assertions
Any version (unconstrained) (< 100.0.9511)Canonical identity product-56937b53f22f721fe9faee4c6c62db916745b96a744cf9ea39b119135982f43bLinked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:a:smartertools:smartermail:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    through excluding 100.0.9511
    Match ID
    d508c7ea-385d-428c-acd3-9e2f93f0fb31

Affected-product evidence

Accepted scope and product mapping

0 canonical links · 2 source-reported links

Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Oct 22, 2026
Retained assertion IDs
7a332379-7240-434c-8963-c492be4bed89
Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Oct 22, 2026
Retained assertion IDs
3a9f5627-33d8-432f-8087-fb4c2a9dd8a2

Assessments

CVSS by origin

9.8
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3
disclosure@vulncheck.comCVSS 4.0 · role Secondary · priority eligiblevalid_matchCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
9.3
VulnCheckCVSS 4.0 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Direct CVE/CNA normalized decisions

9.3Priority eligible

VulnCheck

CVSS 4.0 · Primary · Original assertion · rank 1

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
Validation
Valid match
Recomputed
9.3
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.