CVE Intelligence
Critical Authentication

CVE-2023-29129 — A vulnerability has been identified in Mendix SAML (Mendix 7 compatible) (All versions >= V1.17.3...

A vulnerability has been identified in Mendix SAML (Mendix 7 compatible) (All versions >= V1.17.3 < V1.18.0), Mendix SAML (Mendix 7 compatible) (All versions >= V1.16.4 < V1.17.3), Mendix SAML (Mendix 8 compatible) (All versions >= V2.3.0 < V2.4.0), Mendix SAML (Mendix 8 compatible) (All versions >= V2.2.0 < V2.3.0), Mendix SAML (Mendix 9 latest compatible, New Track) (All versions >= V3.3.1 < V3.6.1), Mendix SAML (Mendix 9 latest compatible, New Track) (All versions >= V3.1.9 < V3.3.1), Mendix SAML (Mendix 9 latest compatible, Upgrade Track) (All versions >= V3.3.0 < V3.6.0), Mendix SAML (Mendix 9 latest compatible, Upgrade Track) (All versions >= V3.1.8 < V3.3.0), Mendix SAML (Mendix 9.12/9.18 compatible, New Track) (All versions >= V3.3.1 < V3.3.15), Mendix SAML (Mendix 9.12/9.18 compatible, Upgrade Track) (All versions >= V3.3.0 < V3.3.14), Mendix SAML (Mendix 9.6 compatible, New Track) (All versions >= V3.1.9 < V3.2.7), Mendix SAML (Mendix 9.6 compatible, Upgrade Track) (All versions >= V3.1.8 < V3.2.6). The affected versions of the module insufficiently verify the SAML assertions. This could allow unauthenticated remote attackers to bypass authentication and get access to the application. This CVE entry describes the incomplete fix for CVE-2023-25957 in a specific non default configuration.

Published Jun 13, 2023 · Updated Oct 24, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: siemens

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.9% (30-day exploitation probability)+9
  • Technical severity (critical)+10
  • Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.89%
ahead of 59% of scored CVEs · Oct 28, 2026
Affects
Mendix
Saml and 8 more
CVSS base
9.8
Critical · 4 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
Yes
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Mendix Saml, Siemens Mendix SAML (Mendix 7 compatible), Siemens Mendix SAML (Mendix 8 compatible)…).
  2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
  3. Apply the fixed version or the patch documented under Remediation.
  4. Search available logs for exploit probes matching the vulnerability class (authentication), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Mendix Saml ≥ 1.16.4 and < 1.18.0≥ 2.2.0 and < 2.4.0≥ 3.1.8 and < 3.6.1 Vulnerable NIST National Vulnerability Database
Siemens Mendix SAML (Mendix 7 compatible) version All versions >= V1.17.3 < V1.18.0version All versions >= V1.16.4 < V1.17.3 Vulnerable CVE Program (cve.org) e CISA ADP
Siemens Mendix SAML (Mendix 8 compatible) version All versions >= V2.3.0 < V2.4.0version All versions >= V2.2.0 < V2.3.0 Vulnerable CVE Program (cve.org) e CISA ADP
Siemens Mendix SAML (Mendix 9 latest compatible, New Track) version All versions >= V3.3.1 < V3.6.1version All versions >= V3.1.9 < V3.3.1 Vulnerable CVE Program (cve.org) e CISA ADP
Siemens Mendix SAML (Mendix 9 latest compatible, Upgrade Track) version All versions >= V3.3.0 < V3.6.0version All versions >= V3.1.8 < V3.3.0 Vulnerable CVE Program (cve.org) e CISA ADP
Siemens Mendix SAML (Mendix 9.12/9.18 compatible, New Track) version All versions >= V3.3.1 < V3.3.15 Vulnerable CVE Program (cve.org) e CISA ADP
Siemens Mendix SAML (Mendix 9.12/9.18 compatible, Upgrade Track) version All versions >= V3.3.0 < V3.3.14 Vulnerable CVE Program (cve.org) e CISA ADP
Siemens Mendix SAML (Mendix 9.6 compatible, New Track) version All versions >= V3.1.9 < V3.2.7 Vulnerable CVE Program (cve.org) e CISA ADP
Siemens Mendix SAML (Mendix 9.6 compatible, Upgrade Track) version All versions >= V3.1.8 < V3.2.6 Vulnerable CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
9.8 CVSS 3.1 Critical 3.9 5.9 nvd@nist.gov via NIST National Vulnerability Database
9.1 CVSS 3.1 Critical 3.9 5.2 productcert@siemens.com via NIST National Vulnerability Database
9.1 CVSS 3.1 Critical — — GitHub, Inc. via GitHub Security Advisories
9.1 CVSS 3.1 Critical — — siemens via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)
Scoring entities (NIST, CNA, ADP) score independently; each score is shown with its origin. For prioritization we use 9.8 (NVD (NIST)) as a conservative provisional reference — not a definitive official score.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-287 · Improper Authentication

Other CVEs with this weakness →

EPSS over time FIRST

Oct 23, 2026 → Oct 28, 2026 · 6 reading(s) · max 0.89%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Review authentication logs: logins without MFA, anomalous sessions and recently created accounts.
web/proxy/WAF logsnetwork IDS/IPSauthentication logs

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · siemens/mendix saml (mendix 7 compatible), siemens/mendix saml (mendix 8 compatible), siemens/mendix saml (mendix 9 late
    Oct 24, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 24, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 24, 2026
  • Fix documented
    Oct 24, 2026 · NIST National Vulnerability Database
  • Affected products added · mendix/saml
    Oct 24, 2026 · NIST National Vulnerability Database
  • CVSS changed · 9.8
    Oct 24, 2026 · NIST National Vulnerability Database
  • Source status changed · → Modified
    Oct 24, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 24, 2026 · Alertas do Telegram
  • 2023
  • CVE published
    Jun 13, 2023 · siemens

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 24, 2026 – Oct 24, 2026
  • 1× Official description updated · Oct 24, 2026 – Oct 24, 2026

References

3 on the record

Elsewhere on this site

Mendix
every CVE for this vendor
Authentication
same class
CWE-287
other pages naming this weakness

Related CVEs (same products)

  • CVE-2023-25957 A vulnerability has been identified in Mendix SAML (Mendix 7 compatible) (All Versions >= 1.16.4 ... Mar 14, 2023

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2023-29129 is "A vulnerability has been identified in Mendix SAML (Mendix 7 compatible) (All versions >= V1.17.3...", rated Critical. It affects Saml (Mendix); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.8 describes technical severity. EPSS 0.89% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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