CVE-2026-45128 (GCVE-0-2026-45128)
Vulnerability from cvelistv5 – Published: 2026-08-18 15:43 – Updated: 2026-08-18 17:55
VLAI
EPSS
VEX
Title
MyBB: ACP Users View Manager default CSRF
Summary
MyBB is free and open source forum software. Prior to 1.8.40, the ACP Users View Manager module does not validate requests correctly, allowing same-site attackers to change a victim administrator's default user list view by embedding a specially crafted URL. The Set as Default control named set_default in Admin CP, Users & Groups, Users, View Manager changes the administrator's default view on GET requests without request forgery protection. The uniquely identifying implementation details include Users & Groups → Users → View Manager, and admin/inc/functions_view_manager.php. This issue is fixed in version 1.8.40.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 17:55 UTC
CWE
- CWE-352 - Cross-Site Request Forgery (CSRF)
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/mybb/mybb/security/advisories/… | x_refsource_CONFIRM |
| https://github.com/mybb/mybb/commit/736a2bcbc7cc1… | x_refsource_MISC |
| https://github.com/mybb/mybb/releases/tag/mybb_1840 | x_refsource_MISC |
| https://mybb.com/versions/1.8.40 | x_refsource_MISC |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-45128",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-18T17:55:42.819787Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-18T17:55:54.781Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "mybb",
"vendor": "mybb",
"versions": [
{
"status": "affected",
"version": "\u003c 1.8.40"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "MyBB is free and open source forum software. Prior to 1.8.40, the ACP Users View Manager module does not validate requests correctly, allowing same-site attackers to change a victim administrator\u0027s default user list view by embedding a specially crafted URL. The Set as Default control named set_default in Admin CP, Users \u0026 Groups, Users, View Manager changes the administrator\u0027s default view on GET requests without request forgery protection. The uniquely identifying implementation details include Users \u0026 Groups \u2192 Users \u2192 View Manager, and admin/inc/functions_view_manager.php. This issue is fixed in version 1.8.40."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.5,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-352",
"description": "CWE-352: Cross-Site Request Forgery (CSRF)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-18T15:43:41.889Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/mybb/mybb/security/advisories/GHSA-m6hr-25cj-p58q",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/mybb/mybb/security/advisories/GHSA-m6hr-25cj-p58q"
},
{
"name": "https://github.com/mybb/mybb/commit/736a2bcbc7cc104df8ae6c0a160aa3917a1ceec0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/commit/736a2bcbc7cc104df8ae6c0a160aa3917a1ceec0"
},
{
"name": "https://github.com/mybb/mybb/releases/tag/mybb_1840",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/mybb/mybb/releases/tag/mybb_1840"
},
{
"name": "https://mybb.com/versions/1.8.40",
"tags": [
"x_refsource_MISC"
],
"url": "https://mybb.com/versions/1.8.40"
}
],
"source": {
"advisory": "GHSA-m6hr-25cj-p58q",
"discovery": "UNKNOWN"
},
"title": "MyBB: ACP Users View Manager default CSRF"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-45128",
"datePublished": "2026-08-18T15:43:41.889Z",
"dateReserved": "2026-05-08T20:08:17.208Z",
"dateUpdated": "2026-08-18T17:55:54.781Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-45128",
"date": "2026-08-24",
"epss": "0.00132",
"percentile": "0.02988"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-45128\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-18T16:17:08.087\",\"lastModified\":\"2026-08-18T18:17:37.433\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"MyBB is free and open source forum software. Prior to 1.8.40, the ACP Users View Manager module does not validate requests correctly, allowing same-site attackers to change a victim administrator\u0027s default user list view by embedding a specially crafted URL. The Set as Default control named set_default in Admin CP, Users \u0026 Groups, Users, View Manager changes the administrator\u0027s default view on GET requests without request forgery protection. The uniquely identifying implementation details include Users \u0026 Groups \u2192 Users \u2192 View Manager, and admin/inc/functions_view_manager.php. This issue is fixed in version 1.8.40.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"mybb\",\"product\":\"mybb\",\"versions\":[{\"version\":\"\u003c 1.8.40\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N\",\"baseScore\":3.5,\"baseSeverity\":\"LOW\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.1,\"impactScore\":1.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-08-18T17:55:42.819787Z\",\"id\":\"CVE-2026-45128\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-352\"}]}],\"references\":[{\"url\":\"https://github.com/mybb/mybb/commit/736a2bcbc7cc104df8ae6c0a160aa3917a1ceec0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/mybb/mybb/releases/tag/mybb_1840\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/mybb/mybb/security/advisories/GHSA-m6hr-25cj-p58q\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://mybb.com/versions/1.8.40\",\"source\":\"security-advisories@github.com\"}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-45128\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-18T17:55:42.819787Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-18T17:55:49.134Z\"}}], \"cna\": {\"title\": \"MyBB: ACP Users View Manager default CSRF\", \"source\": {\"advisory\": \"GHSA-m6hr-25cj-p58q\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 3.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"LOW\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"mybb\", \"product\": \"mybb\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 1.8.40\"}]}], \"references\": [{\"url\": \"https://github.com/mybb/mybb/security/advisories/GHSA-m6hr-25cj-p58q\", \"name\": \"https://github.com/mybb/mybb/security/advisories/GHSA-m6hr-25cj-p58q\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/mybb/mybb/commit/736a2bcbc7cc104df8ae6c0a160aa3917a1ceec0\", \"name\": \"https://github.com/mybb/mybb/commit/736a2bcbc7cc104df8ae6c0a160aa3917a1ceec0\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/mybb/mybb/releases/tag/mybb_1840\", \"name\": \"https://github.com/mybb/mybb/releases/tag/mybb_1840\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://mybb.com/versions/1.8.40\", \"name\": \"https://mybb.com/versions/1.8.40\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"MyBB is free and open source forum software. Prior to 1.8.40, the ACP Users View Manager module does not validate requests correctly, allowing same-site attackers to change a victim administrator\u0027s default user list view by embedding a specially crafted URL. The Set as Default control named set_default in Admin CP, Users \u0026 Groups, Users, View Manager changes the administrator\u0027s default view on GET requests without request forgery protection. The uniquely identifying implementation details include Users \u0026 Groups \\u2192 Users \\u2192 View Manager, and admin/inc/functions_view_manager.php. This issue is fixed in version 1.8.40.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-352\", \"description\": \"CWE-352: Cross-Site Request Forgery (CSRF)\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-08-18T15:43:41.889Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-45128\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-18T17:55:54.781Z\", \"dateReserved\": \"2026-05-08T20:08:17.208Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-08-18T15:43:41.889Z\", \"assignerShortName\": \"GitHub_M\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
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.
Loading…
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.
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.
Loading…
Loading…