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4 vulnerabilities found for Custom Block Builder by Unknown
CVE-2026-8981 (GCVE-0-2026-8981)
Vulnerability from nvd – Published: 2026-06-09 06:00 – Updated: 2026-06-09 10:32
VLAI
EPSS
VEX
Title
Lazy Blocks < 4.3.0 - Admin+ Stored XSS via Custom Block Frontend HTML
Summary
The Custom Block Builder WordPress plugin before 4.3.0 does not consistently check the unfiltered_html capability across all paths that write to its block template code fields, allowing administrators on multisite installations (or single-site installs with DISALLOW_UNFILTERED_HTML defined) to inject arbitrary JavaScript that executes for any visitor of pages embedding the affected block.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 Cross-Site Scripting (XSS)
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://wpscan.com/vulnerability/9815b0e6-e411-4a… | exploitvdb-entrytechnical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Unknown | Custom Block Builder |
Affected:
0 , < 4.3.0
(semver)
|
Credits
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"attackVector": "NETWORK",
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"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N",
"version": "3.1"
}
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],
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"timestamp": "2026-06-09T10:32:46.274624Z",
"version": "2.0.3"
},
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}
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}
]
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],
"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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{
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"vendor": "Unknown",
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}
]
}
],
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{
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"type": "finder",
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},
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],
"descriptions": [
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}
],
"problemTypes": [
{
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"providerMetadata": {
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},
"references": [
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],
"url": "https://wpscan.com/vulnerability/9815b0e6-e411-4a5c-9c63-30bad21da698/"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Lazy Blocks \u003c 4.3.0 - Admin+ Stored XSS via Custom Block Frontend HTML",
"x_generator": {
"engine": "WPScan CVE Generator"
}
}
},
"cveMetadata": {
"assignerOrgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
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"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
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CVE-2024-12878 (GCVE-0-2024-12878)
Vulnerability from nvd – Published: 2025-02-26 06:00 – Updated: 2025-02-26 16:02
VLAI
EPSS
VEX
Title
Custom Block Builder – Lazy Blocks < 3.8.3 - Reflected XSS
Summary
The Custom Block Builder WordPress plugin before 3.8.3 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.
Severity
7.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://wpscan.com/vulnerability/827444d1-87cb-40… | exploitvdb-entrytechnical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Unknown | Custom Block Builder |
Affected:
0 , < 3.8.3
(semver)
|
Credits
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"metrics": [
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"attackVector": "NETWORK",
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"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L",
"version": "3.1"
}
},
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"timestamp": "2025-02-26T16:01:37.241384Z",
"version": "2.0.3"
},
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}
}
],
"providerMetadata": {
"dateUpdated": "2025-02-26T16:02:27.112Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Custom Block Builder",
"vendor": "Unknown",
"versions": [
{
"lessThan": "3.8.3",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Hassan Khan Yusufzai - Splint3r7"
},
{
"lang": "en",
"type": "coordinator",
"value": "WPScan"
}
],
"descriptions": [
{
"lang": "en",
"value": "The Custom Block Builder WordPress plugin before 3.8.3 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin."
}
],
"problemTypes": [
{
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{
"description": "CWE-79 Cross-Site Scripting (XSS)",
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"type": "CWE"
}
]
}
],
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"orgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
"shortName": "WPScan"
},
"references": [
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"technical-description"
],
"url": "https://wpscan.com/vulnerability/827444d1-87cb-4057-827a-d802eac82cf8/"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Custom Block Builder \u2013 Lazy Blocks \u003c 3.8.3 - Reflected XSS",
"x_generator": {
"engine": "WPScan CVE Generator"
}
}
},
"cveMetadata": {
"assignerOrgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
"assignerShortName": "WPScan",
"cveId": "CVE-2024-12878",
"datePublished": "2025-02-26T06:00:07.209Z",
"dateReserved": "2024-12-20T21:50:20.452Z",
"dateUpdated": "2025-02-26T16:02:27.112Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
CVE-2026-8981 (GCVE-0-2026-8981)
Vulnerability from cvelistv5 – Published: 2026-06-09 06:00 – Updated: 2026-06-09 10:32
VLAI
EPSS
VEX
Title
Lazy Blocks < 4.3.0 - Admin+ Stored XSS via Custom Block Frontend HTML
Summary
The Custom Block Builder WordPress plugin before 4.3.0 does not consistently check the unfiltered_html capability across all paths that write to its block template code fields, allowing administrators on multisite installations (or single-site installs with DISALLOW_UNFILTERED_HTML defined) to inject arbitrary JavaScript that executes for any visitor of pages embedding the affected block.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-79 Cross-Site Scripting (XSS)
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://wpscan.com/vulnerability/9815b0e6-e411-4a… | exploitvdb-entrytechnical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Unknown | Custom Block Builder |
Affected:
0 , < 4.3.0
(semver)
|
Credits
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.5,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N",
"version": "3.1"
}
},
{
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],
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"timestamp": "2026-06-09T10:32:46.274624Z",
"version": "2.0.3"
},
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}
}
],
"problemTypes": [
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"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-09T10:32:50.766Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Custom Block Builder",
"vendor": "Unknown",
"versions": [
{
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"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Luca Jungnickel"
},
{
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"type": "coordinator",
"value": "WPScan"
}
],
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{
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}
],
"problemTypes": [
{
"descriptions": [
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"providerMetadata": {
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"orgId": "1bfdd5d7-9bf6-4a53-96ea-42e2716d7a81",
"shortName": "WPScan"
},
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}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Lazy Blocks \u003c 4.3.0 - Admin+ Stored XSS via Custom Block Frontend HTML",
"x_generator": {
"engine": "WPScan CVE Generator"
}
}
},
"cveMetadata": {
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"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2024-12878 (GCVE-0-2024-12878)
Vulnerability from cvelistv5 – Published: 2025-02-26 06:00 – Updated: 2025-02-26 16:02
VLAI
EPSS
VEX
Title
Custom Block Builder – Lazy Blocks < 3.8.3 - Reflected XSS
Summary
The Custom Block Builder WordPress plugin before 3.8.3 does not sanitise and escape a parameter before outputting it back in the page, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin.
Severity
7.1 (High)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://wpscan.com/vulnerability/827444d1-87cb-40… | exploitvdb-entrytechnical-description |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Unknown | Custom Block Builder |
Affected:
0 , < 3.8.3
(semver)
|
Credits
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"metrics": [
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"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
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}
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
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"version": "0",
"versionType": "semver"
}
]
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"credits": [
{
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"type": "finder",
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},
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}
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{
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{
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}
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}
],
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},
"title": "Custom Block Builder \u2013 Lazy Blocks \u003c 3.8.3 - Reflected XSS",
"x_generator": {
"engine": "WPScan CVE Generator"
}
}
},
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