MaxSite CMS up to 109.3 Guestbook Plugin f_text/f_slug/f_limit/f_email cross site scripting
Summary
A vulnerability was found in MaxSite CMS up to 109.3. It has been classified as problematic. Impacted is an unknown function of the component Guestbook Plugin. Performing a manipulation of the argument f_text/f_slug/f_limit/f_email results in cross site scripting. This vulnerability is known as CVE-2026-7015. Remote exploitation of the attack is possible. Furthermore, an exploit is available. Upgrading the affected component is recommended. The vendor was informed early about this issue. They classify it as a "Self-XSS". They deployed a countermeasure: "Nevertheless, we consider this a violation of secure coding standards. The lack of filtering via `htmlspecialchars()` has already been fixed in the latest patch to prevent incorrect data display."
Details
A vulnerability classified as problematic has been found in MaxSite CMS up to 109.3. This affects an unknown code block of the component Guestbook Plugin. The manipulation of the argument f_text/f_slug/f_limit/f_email with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity.
It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-7015. The exploitability is told to be easy. It is possible to initiate the attack remotely. The exploitation requires an enhanced level of successful authentication. It demands that the victim is doing some kind of user interaction. Technical details and a public exploit are known. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.
The exploit is shared for download at github.com. It is declared as proof-of-concept. The vendor was informed early about this issue. They classify it as a "Self-XSS". They deployed a countermeasure: "Nevertheless, we consider this a violation of secure coding standards. The lack of filtering via `htmlspecialchars()` has already been fixed in the latest patch to prevent incorrect data display."
Upgrading to version 109.4 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Product
Type
Vendor
Name
Version
License
Website
- Product: https://github.com/maxsite/cms/
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 2.4VulDB Meta Temp Score: 2.2
VulDB Base Score: 2.4
VulDB Temp Score: 2.2
VulDB Vector: 🔒
VulDB Reliability: 🔍
CVSSv2
| AV | AC | Au | C | I | A |
|---|---|---|---|---|---|
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Exploiting
Class: Cross site scriptingCWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒
Physical: No
Local: No
Remote: Yes
Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
EPSS Score: 🔒
EPSS Percentile: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
| 0-Day | Unlock | Unlock | Unlock | Unlock |
|---|---|---|---|---|
| Today | Unlock | Unlock | Unlock | Unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
0-Day Time: 🔒
Upgrade: CMS 109.4
Patch: 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7
Timeline
04/25/2026 Advisory disclosed04/25/2026 VulDB entry created
04/25/2026 VulDB entry last update
Sources
Product: github.comAdvisory: github.com
Status: Confirmed
CVE: CVE-2026-7015 (🔒)
GCVE (CVE): GCVE-0-2026-7015
GCVE (VulDB): GCVE-100-359595
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 04/25/2026 12:19Changes: 04/25/2026 12:19 (62)
Complete: 🔍
Submitter: konchan
Cache ID: 216::103
Submit
Accepted
- Submit #796740: MaxSite CMS 109.3 Cross Site Scripting (by konchan)
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
No comments yet. Languages: en.
Please log in to comment.