Stored XXS vulnerability in mbnet, mbnet.rokey, REX 200 and REX 250
A vulnerability in Red Lion Europe mbNET/mbNET.rokey and Helmholz REX 200 and REX 250 devices with firmware lower 7.3.2 allows an authenticated remote attacker with high privileges to inject malicious HTML or JavaScript code (XSS).
- Published
- Aug 17, 2023
- Updated
- Jun 17, 2026
- EPSS
- 0.4% · 35th percentile
- CWE
- CWE-79
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Report tools
Action score
19
Monitor
Low priority for now.
- CVSS
- 19 / 40 · 4.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
CNA vs NVD score
- NVD
- —
- CNA · CERTVDE
- 4.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| helmholz | rex 250 firmware | cpe:2.3:o:helmholz:rex_250_firmware |
| helmholz | rex 250 | cpe:2.3:h:helmholz:rex_250 |
| helmholz | rex 200 firmware | cpe:2.3:o:helmholz:rex_200_firmware |
| helmholz | rex 200 | cpe:2.3:h:helmholz:rex_200 |
| redlion | mbnet.rokey rkh 210 firmware | cpe:2.3:o:redlion:mbnet.rokey_rkh_210_firmware |
| redlion | mbnet.rokey rkh 210 | cpe:2.3:h:redlion:mbnet.rokey_rkh_210 |
| redlion | mbnet.rokey rkh 216 firmware | cpe:2.3:o:redlion:mbnet.rokey_rkh_216_firmware |
| redlion | mbnet.rokey rkh 216 | cpe:2.3:h:redlion:mbnet.rokey_rkh_216 |
| redlion | mbnet.rokey rkh 235 firmware | cpe:2.3:o:redlion:mbnet.rokey_rkh_235_firmware |
| redlion | mbnet.rokey rkh 235 | cpe:2.3:h:redlion:mbnet.rokey_rkh_235 |
| redlion | mbnet.rokey rkh 259 firmware | cpe:2.3:o:redlion:mbnet.rokey_rkh_259_firmware |
| redlion | mbnet.rokey rkh 259 | cpe:2.3:h:redlion:mbnet.rokey_rkh_259 |
and 22 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- helmholz rex 200 firmwarebefore 7.3.2
- helmholz rex 250 firmwarebefore 7.3.2
- redlion mbnet mdh 811 firmwarebefore 7.3.2
- redlion mbnet mdh 816 firmwarebefore 7.3.2
- redlion mbnet mdh 831 firmwarebefore 7.3.2
- redlion mbnet mdh 835 firmwarebefore 7.3.2
- redlion mbnet mdh 841 firmwarebefore 7.3.2
- redlion mbnet mdh 850 firmwarebefore 7.3.2
- redlion mbnet mdh 855 firmwarebefore 7.3.2
- redlion mbnet mdh 858 firmwarebefore 7.3.2
- redlion mbnet mdh 859 firmwarebefore 7.3.2
- redlion mbnet mdh 871 firmwarebefore 7.3.2
- redlion mbnet mdh 876 firmwarebefore 7.3.2
- redlion mbnet.rokey rkh 210 firmwarebefore 7.3.2
- redlion mbnet.rokey rkh 216 firmwarebefore 7.3.2
- redlion mbnet.rokey rkh 235 firmwarebefore 7.3.2
- redlion mbnet.rokey rkh 259 firmwarebefore 7.3.2
Versions reported by the vendor
Affected version ranges reported by the assigning authority (CERTVDE). Independent of NVD's CPE analysis and usually ahead of it.
Helmholz REX 200
- before 7.3.2affected · semver
Helmholz REX 250
- before 7.3.2affected · semver
Red Lion Europe mbNET
- before 7.3.2affected · semver
Red Lion Europe mbNET.rokey
- before 7.3.2affected · semver
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Helmholz REX 200 | 7.3.2 | Vendor (CNA) |
| Helmholz REX 250 | 7.3.2 | Vendor (CNA) |
| Red Lion Europe mbNET | 7.3.2 | Vendor (CNA) |
| Red Lion Europe mbNET.rokey | 7.3.2 | Vendor (CNA) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- Administrator privileges are required.
- A user must open a link or visit a page.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- none
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- Required
- Scope
- Changed
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
nvd-secondary
Root cause
User content is inserted into the page as HTML. The browser interprets the content as code rather than data.
The bug in code
The whole CWE-79 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
commentEl.innerHTML = comment.body;Fixed
commentEl.textContent = comment.body;Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
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References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.