CVE-2026-7891General

MEDIUM

Exploitation ongoing with high activity in latest observed window (2 mentions)

Immediate actions

Patch affected systems immediately
Assume compromise if assets are exposed

Recommended action window: Immediate (within 24h)

NVD description

Rejected reason: This CVE has been retracted. Re-investigation confirmed the reported behavior is expected platform configuration and does not expose the protected attribute.

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4.0/ 10 priority

Priority

MEDIUM

Exploitation

ACTIVE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

Active exploitation appears in 1 classified signals
Patch or workaround signal is available
5 mentions across 4 observed days
Momentum state: stable

What's happening

Active exploitation reported across 1 signal
Patch or workaround mentioned in 1 signal
Technical details provided in 4 signals
General: 2 classified signals
Disclosure: 2 classified signals
Peaked at 2 mentions on most recent observed day (2026-07-28)
5 total mentions across 4 days

Deep dive

Activity timeline5 mentions / 4d

Signal classification3 categories

General

240.0%

Disclosure

240.0%

Active Exploitation

120.0%

Referenced assets6 URLs

By indicator

Classification over time

Date	Total	Labels

2026-05-08	1	General1
2026-05-10	1	Disclosure1
2026-07-23	1	General1
2026-07-28	2	Active Exploitation1Disclosure1

Full discourse5 posts

Aviatrix Threat Research Center@aviatrixtrc73d
Active Exploitation
TRC analysis shows attackers exploiting misconfigured Mendix access rules (CVE-2026-7891) to escalate privileges and move laterally within applications. The vulnerability affects all Mendix Runtime versions due to inadequate System.User entity documentation. Runtime segmentation helps contain such post-compromise activity. #CloudSecurity 🔗 Full TRC analysis: https://aviatrix.ai/threat-research-center/icsa-26-209-02-cve-2026-7891
Post summary
Attackers are actively exploiting CVE-2026-7891 through misconfigured Mendix access rules to elevate privileges; runtime segmentation is recommended as a containment measure.
0000042
1.9K followersView on X
Windows Forum@windowsforum73d
Disclosure
🚨 Mendix’s System.User rules can override XPath restrictions and expose accounts across every platform version. When “deny” means “actually, maybe,” authorization gets spicy. https://windowsforum.com/security-alerts.84/cve-2026-7891-mendix-system-user-xpath-rules-can-expose-accounts.440733/?utm_source=x&utm_medium=social&utm_campaign=news_node84 #AccessControl #SiemensProductcert #MendixSecurity #Cve20267891 https://t.co/RKhZQlJ5W8
Post summary
The tweet discloses that Mendix System.User rules can override XPath restrictions, potentially exposing user accounts across all platform versions.
0000044
1.3K followersView on X
CERT-PY@CERTpy78d
General
⚠️ Vulnerabilidades en productos Siemens ❗ CVE-2026-7891 ❗ CVE-2026-56451 ➡️ Más info: https://www.cert.gov.py/vulnerabilidades-en-productos-siemens-8/ https://t.co/bcDSQfSM36
Post summary
The message notes Siemens product vulnerabilities identified by two CVE IDs and provides links for more information, but offers no further technical or exploitation details.
00000194
6.7K followersView on X
CVE@CVEnew152d
Disclosure
CVE-2026-7891 The VerySecureApp made by DIVD using Mendix Studio Pro 11.8.0 Beta allows unintended data exposure due to authorization misconfiguration. The VerySecureApp allows anony… https://www.cve.org/CVERecord?id=CVE-2026-7891
Post summary
The text announces CVE‑2026‑7891, describing an authorization misconfiguration that leads to data exposure in the VerySecureApp; no PoC, exploit code, or patch details are supplied.
00000226
57.5K followersView on X
Vulmon Vulnerability Feed@VulmonFeeds155d
General
CVE-2026-7891 Unintended Data Exposure in VerySecureApp via Authorization Misconfigurat... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-7891 Vulnerability Notification: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=3
Post summary
A brief notification of CVE-2026-7891 highlighting an authorization misconfiguration that could lead to data exposure in VerySecureApp, but lacking detailed technical info or actionable guidance.
0000061
4.0K followersView on X

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What researchers are saying

CVE-2026-7891

Aviatrix Threat Research Center[verified]@aviatrixtrcActive Exploitation

Attackers are actively exploiting CVE-2026-7891 through misconfigured Mendix access rules to elevate privileges; runtime segmentation is recommended as a containment measure.

Windows Forum[verified]@windowsforumDisclosure

The tweet discloses that Mendix System.User rules can override XPath restrictions, potentially exposing user accounts across all platform versions.

CERT-PY@CERTpyGeneral

The message notes Siemens product vulnerabilities identified by two CVE IDs and provides links for more information, but offers no further technical or exploitation details.

CVE@CVEnewDisclosure

The text announces CVE‑2026‑7891, describing an authorization misconfiguration that leads to data exposure in the VerySecureApp; no PoC, exploit code, or patch details are supplied.

Vulmon Vulnerability Feed@VulmonFeedsGeneral

A brief notification of CVE-2026-7891 highlighting an authorization misconfiguration that could lead to data exposure in VerySecureApp, but lacking detailed technical info or actionable guidance.