179 lines
7.7 KiB
JSON
179 lines
7.7 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2026-54740",
|
|
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "GitHub_M",
|
|
"dateReserved": "2026-06-15T23:07:33.233Z",
|
|
"datePublished": "2026-08-19T20:14:29.391Z",
|
|
"dateUpdated": "2026-08-20T19:57:12.849Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"title": "Lemmy: Lower-ranked federated moderator can remove higher-ranked moderators",
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"cweId": "CWE-862",
|
|
"lang": "en",
|
|
"description": "CWE-862: Missing Authorization",
|
|
"type": "CWE"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"attackComplexity": "LOW",
|
|
"attackVector": "NETWORK",
|
|
"availabilityImpact": "NONE",
|
|
"baseScore": 6.5,
|
|
"baseSeverity": "MEDIUM",
|
|
"confidentialityImpact": "NONE",
|
|
"integrityImpact": "HIGH",
|
|
"privilegesRequired": "LOW",
|
|
"scope": "UNCHANGED",
|
|
"userInteraction": "NONE",
|
|
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
|
|
"version": "3.1"
|
|
}
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"name": "https://github.com/LemmyNet/lemmy/security/advisories/GHSA-xmpx-2j2f-c7g7",
|
|
"tags": [
|
|
"x_refsource_CONFIRM"
|
|
],
|
|
"url": "https://github.com/LemmyNet/lemmy/security/advisories/GHSA-xmpx-2j2f-c7g7"
|
|
},
|
|
{
|
|
"name": "https://github.com/LemmyNet/lemmy/pull/6475",
|
|
"tags": [
|
|
"x_refsource_MISC"
|
|
],
|
|
"url": "https://github.com/LemmyNet/lemmy/pull/6475"
|
|
},
|
|
{
|
|
"name": "https://github.com/LemmyNet/lemmy/pull/6478",
|
|
"tags": [
|
|
"x_refsource_MISC"
|
|
],
|
|
"url": "https://github.com/LemmyNet/lemmy/pull/6478"
|
|
},
|
|
{
|
|
"name": "https://github.com/LemmyNet/lemmy/commit/d127e714a66f34f6b9c8ea15f20097ac907cdf28",
|
|
"tags": [
|
|
"x_refsource_MISC"
|
|
],
|
|
"url": "https://github.com/LemmyNet/lemmy/commit/d127e714a66f34f6b9c8ea15f20097ac907cdf28"
|
|
},
|
|
{
|
|
"name": "https://github.com/LemmyNet/lemmy/commit/ede1d348344ca2027fd1bc6a0cab25575c0c3a4c",
|
|
"tags": [
|
|
"x_refsource_MISC"
|
|
],
|
|
"url": "https://github.com/LemmyNet/lemmy/commit/ede1d348344ca2027fd1bc6a0cab25575c0c3a4c"
|
|
},
|
|
{
|
|
"name": "https://github.com/LemmyNet/lemmy/releases/tag/0.19.19",
|
|
"tags": [
|
|
"x_refsource_MISC"
|
|
],
|
|
"url": "https://github.com/LemmyNet/lemmy/releases/tag/0.19.19"
|
|
},
|
|
{
|
|
"name": "https://github.com/LemmyNet/lemmy/releases/tag/1.0.0-alpha.18",
|
|
"tags": [
|
|
"x_refsource_MISC"
|
|
],
|
|
"url": "https://github.com/LemmyNet/lemmy/releases/tag/1.0.0-alpha.18"
|
|
},
|
|
{
|
|
"name": "https://join-lemmy.org/news/2026-06-09_-_Lemmy_Release_v0.19.19",
|
|
"tags": [
|
|
"x_refsource_MISC"
|
|
],
|
|
"url": "https://join-lemmy.org/news/2026-06-09_-_Lemmy_Release_v0.19.19"
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"vendor": "LemmyNet",
|
|
"product": "lemmy",
|
|
"versions": [
|
|
{
|
|
"version": "< 0.19.19",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": ">= 1.0.0-alpha.0, < 1.0.0-alpha.18",
|
|
"status": "affected"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"providerMetadata": {
|
|
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
|
|
"shortName": "GitHub_M",
|
|
"dateUpdated": "2026-08-19T20:14:29.391Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "Lemmy is a link aggregator and forum for the fediverse. Prior to 0.19.19 and 1.0.0-alpha.18, a lower-ranked remote moderator can remove a higher-ranked moderator by sending a signed ActivityPub Remove activity to the target instance. The local API uses LocalUser::is_higher_mod_or_admin_check to enforce moderator rank, but CollectionRemove::verify in crates/apub/activities/src/community/collection_remove.rs only calls verify_mod_action. CollectionRemove::receive dereferences self.object as an ApubPerson, creates a CommunityModeratorForm, and calls CommunityActions::leave without checking that the actor outranks the moderator identified by the object field. In communities with federated moderators, a junior moderator can therefore strip senior moderators from the community moderator list even though the local API rejects the same action. This issue is fixed in versions 0.19.19 and 1.0.0-alpha.18."
|
|
}
|
|
],
|
|
"source": {
|
|
"advisory": "GHSA-xmpx-2j2f-c7g7",
|
|
"discovery": "UNKNOWN"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"references": [
|
|
{
|
|
"url": "https://github.com/LemmyNet/lemmy/security/advisories/GHSA-xmpx-2j2f-c7g7",
|
|
"tags": [
|
|
"exploit"
|
|
]
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"timestamp": "2026-08-20T19:57:07.165095Z",
|
|
"id": "CVE-2026-54740",
|
|
"options": [
|
|
{
|
|
"Exploitation": "poc"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "partial"
|
|
}
|
|
],
|
|
"role": "CISA Coordinator",
|
|
"version": "2.0.3"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-08-20T19:57:12.849Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |