CVE-2026-108566 | BDVDB-2026-385704 Detail

InstantSofticms2

Description#

A vulnerability has been found in InstantSoft icms2 up to 2.18.2. This issue affects the function index of the file templates/default/controllers/messages/index.tpl.php of the component Private Message Handler. Such manipulation of the argument nickname leads to cross site scripting. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The name of the patch is 3a1ec8fcb073a46d06a2ab83bc2bf68225834281. It is best practice to apply a patch to resolve this issue.

Impact#

Per CVSS v3.1: confidentiality impact none, integrity impact low, availability impact none. Attack vector: network.

Weaknesses#

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-94 Improper Control of Generation of Code ('Code Injection')

References#

Exploit#

No public exploit known

History#

Version 12026-10-11Record published in the CVE List.
Version 22026-10-13Most recent update recorded in the CVE List.

Published

Published: 2026-10-11
Last modified: 2026-10-13

Vendor information

Vendor: InstantSoft
Product: icms2

All InstantSoft vulnerabilities

Score

3.5 Low

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 15.3.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Cross-Site Scripting

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
2.18.0
Fixed
Not stated
Vulnerable
2.18.1
Fixed
Not stated
Vulnerable
2.18.2
Fixed
Not stated

Scoring System

CVSS v4.0

5.1 Medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	None
Privileges Required	Low
User Interaction	Passive
Vulnerable System Confidentiality	None
Vulnerable System Integrity	Low
Vulnerable System Availability	None
Subsequent System Confidentiality	None
Subsequent System Integrity	None
Subsequent System Availability	None

CVSS v3.1

3.5 Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	Low
User Interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity	Low
Availability	None

CVSS v3.0

3.5 Low

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	Low
User Interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity	Low
Availability	None

CVSS v2

4.0 Medium

AV:N/AC:L/Au:S/C:N/I:P/A:N/E:POC/RL:OF/RC:C

Metric breakdown
Access Vector	Network
Access Complexity	Low
Authentication	Single
Confidentiality Impact	None
Integrity Impact	Partial
Availability Impact	None

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).