CVE-2026-108566 (GCVE-0-2026-108566)
Vulnerability from cvelistv5 – Published: 2026-10-11 09:15 – Updated: 2026-10-11 09:15 X_Open Source
VLAI
EPSS
VEX
Title
InstantSoft icms2 Private Message index.tpl.php index cross site scripting
Summary
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.
Severity
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/416223 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/416223/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-108566 | third-party-advisory |
| https://vuldb.com/submit/954247 | third-party-advisory |
| https://github.com/instantsoft/icms2/commit/3a1ec… | patch |
| https://github.com/instantsoft/icms2/ | product |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| InstantSoft | icms2 |
Affected:
2.18.0
Affected: 2.18.1 Affected: 2.18.2 cpe:2.3:a:instantsoft:icms2:*:*:*:*:*:*:*:* |
{
"containers": {
"cna": {
"affected": [
{
"cpes": [
"cpe:2.3:a:instantsoft:icms2:*:*:*:*:*:*:*:*"
],
"modules": [
"Private Message Handler"
],
"product": "icms2",
"vendor": "InstantSoft",
"versions": [
{
"status": "affected",
"version": "2.18.0"
},
{
"status": "affected",
"version": "2.18.1"
},
{
"status": "affected",
"version": "2.18.2"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "EVIL0RD (VulDB User)"
},
{
"lang": "en",
"type": "coordinator",
"value": "VulDB Vulnerability Moderation Team"
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
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"vectorString": "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",
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"description": "Cross Site Scripting",
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{
"descriptions": [
{
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"description": "Code Injection",
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"providerMetadata": {
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"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"shortName": "VulDB"
},
"references": [
{
"name": "VDB-416223 | InstantSoft icms2 Private Message index.tpl.php index cross site scripting",
"tags": [
"vdb-entry",
"technical-description"
],
"url": "https://vuldb.com/vuln/416223"
},
{
"name": "VDB-416223 | CTI Indicators (IOB, IOC, TTP, IOA)",
"tags": [
"signature",
"permissions-required"
],
"url": "https://vuldb.com/vuln/416223/cti"
},
{
"name": "CVE-2026-108566 | CVE Analysis and Report",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/cve/CVE-2026-108566"
},
{
"name": "Submit #954247 | InstantCMS InstantCMS icms2 2.18.2 Cross-Site Scripting (XSS)",
"tags": [
"third-party-advisory"
],
"url": "https://vuldb.com/submit/954247"
},
{
"tags": [
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],
"url": "https://github.com/instantsoft/icms2/commit/3a1ec8fcb073a46d06a2ab83bc2bf68225834281"
},
{
"tags": [
"product"
],
"url": "https://github.com/instantsoft/icms2/"
}
],
"tags": [
"x_open-source"
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"timeline": [
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"time": "2026-10-10T00:00:00.000Z",
"value": "Advisory disclosed"
},
{
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"time": "2026-10-10T02:00:00.000Z",
"value": "VulDB entry created"
},
{
"lang": "en",
"time": "2026-10-10T17:09:29.000Z",
"value": "VulDB entry last update"
}
],
"title": "InstantSoft icms2 Private Message index.tpl.php index cross site scripting",
"x_generator": [
"VulDB PVTS v202610"
]
}
},
"cveMetadata": {
"assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
"assignerShortName": "VulDB",
"cveId": "CVE-2026-108566",
"datePublished": "2026-10-11T09:15:16.508Z",
"dateReserved": "2026-10-10T15:04:16.038Z",
"dateUpdated": "2026-10-11T09:15:16.508Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.2",
"vulnerability-lookup:meta": {
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"date": "2026-10-11",
"epss": "0.00348",
"percentile": "0.26438"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"cpes": [
"cpe:2.3:a:instantsoft:icms2:*:*:*:*:*:*:*:*"
],
"modules": [
"Private Message Handler"
],
"product": "icms2",
"vendor": "InstantSoft",
"versions": [
{
"status": "affected",
"version": "2.18.0"
},
{
"status": "affected",
"version": "2.18.1"
},
{
"status": "affected",
"version": "2.18.2"
}
]
}
],
"source": "cna@vuldb.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"id": "CVE-2026-108566",
"lastModified": "2026-10-11T10:16:38.727",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
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"authentication": "SINGLE",
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},
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"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
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"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
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"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
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"version": "4.0",
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"published": "2026-10-11T10:16:38.727",
"references": [
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"url": "https://github.com/instantsoft/icms2/"
},
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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