Disabled TLS Certificate Validation Enables MITM Attacks
AM Club for Android versions from 1.7.194 before 1.8.198 are affected, and the flaw involves a shared MQTT broker account. The vendor's fixed version is 1.8.198.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 1.8.198
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 1.8.198.
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 25/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: partial
Summary
The AM CLUB mobile application uses hard-coded MQTT credentials, which let an attacker connect to the MQTT broker to access data or perform actions across tenant boundaries. An attacker can reach it remotely over the network without logging in and without any user action.
Read the original description
Use of hard-coded MQTT credentials in the AM CLUB mobile application allows an authenticated attacker to connect to the MQTT broker and access data or perform actions across tenant boundaries.
cve.now Index
- Exploitation0/40No signal
- Exposure17/25No login or user action needed, reachable over the network without a login · Unknown: Advisories don't say whether default setups are affected
- Reach?/20Unknown. No tracked technology or package matched
- Severity7.8/10CVSS 7.8
- No patch0/5No signal
What would change the score
- Would score about 70 if added to CISA KEV
- Would score about 65 if CISA's SSVC rates exploitation active
- Would score about 30 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 1.8.198.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: partial
- Record last updated
Affected versions
- am_automatic_machines am_club
From 1.7.194 · fixed in 1.8.198
Evidence 1
- Advisory
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-103906
Is CVE-2026-103906 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
The app does not validate the server's TLS certificate, so a man-in-the-middle attacker on the network path can intercept the connection to the MQTT broker. A successful connection gives the attacker whatever access is assigned to the shared broker account, such as machine status and remote-management functions.Source: github.com
Which versions are affected by CVE-2026-103906?
am_club: from 1.7.194 before 1.8.198.Source: cve.now feed data
Am I affected, and how do I check?
The affected range is listed as introduced in 1.7.194 and fixed in 1.8.198. The advisory examined build 1.7.189 (10889) of AM Club for Android. To check a device, compare the installed app version in the Android app details against this range.Source: github.com
How do I fix CVE-2026-103906?
Update AM Club for Android to version 1.8.198 or later, which is the listed fixed version.Source: github.com
Why do the sources disagree?
The description says the attack requires authenticated access, while the CVSS vector records no privileges required (PR:N). The sources therefore differ on whether credentials are needed.Source: github.com