CVE-2026-55210 (GCVE-0-2026-55210)
Vulnerability from cvelistv5
Published
2026-09-21 21:14
Modified
2026-09-22 13:07
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-290 - Authentication Bypass by Spoofing
Summary
Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.2, Joplin Server's UserModel.ssoLogin() returns an existing account matched by an IdP-asserted email without checking the account's is_external flag. In deployments using mixed local and SAML authentication, an attacker whose IdP session can assert a local user's email can pass POST /api/saml, receive a session for that local account, and access or modify the victim's notes, files, and settings without knowing the local password. This issue is fixed in version 3.7.2.
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-55210",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-22T13:06:34.047429Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-09-22T13:07:10.486Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "joplin",
"vendor": "laurent22",
"versions": [
{
"status": "affected",
"version": "\u003c 3.7.2"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.2, Joplin Server\u0027s UserModel.ssoLogin() returns an existing account matched by an IdP-asserted email without checking the account\u0027s is_external flag. In deployments using mixed local and SAML authentication, an attacker whose IdP session can assert a local user\u0027s email can pass POST /api/saml, receive a session for that local account, and access or modify the victim\u0027s notes, files, and settings without knowing the local password. This issue is fixed in version 3.7.2."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-290",
"description": "CWE-290: Authentication Bypass by Spoofing",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-21T21:14:31.267Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5"
},
{
"name": "https://github.com/laurent22/joplin/pull/15647",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/laurent22/joplin/pull/15647"
},
{
"name": "https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2"
}
],
"source": {
"advisory": "GHSA-5px3-4f5x-hjc5",
"discovery": "UNKNOWN"
},
"title": "Joplin: SAML SSO account takeover via email-based account linking (missing is_external check in ssoLogin)"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55210",
"datePublished": "2026-09-21T21:14:31.267Z",
"dateReserved": "2026-06-16T16:16:32.627Z",
"dateUpdated": "2026-09-22T13:07:10.486Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-55210\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-22T13:06:34.047429Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-22T13:07:05.671Z\"}}], \"cna\": {\"title\": \"Joplin: SAML SSO account takeover via email-based account linking (missing is_external check in ssoLogin)\", \"source\": {\"advisory\": \"GHSA-5px3-4f5x-hjc5\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.4, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"laurent22\", \"product\": \"joplin\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 3.7.2\"}]}], \"references\": [{\"url\": \"https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5\", \"name\": \"https://github.com/laurent22/joplin/security/advisories/GHSA-5px3-4f5x-hjc5\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/laurent22/joplin/pull/15647\", \"name\": \"https://github.com/laurent22/joplin/pull/15647\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2\", \"name\": \"https://github.com/laurent22/joplin/commit/b6d69d072919cbe769234f93d95ed21e1ec129b2\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Joplin is an open source note-taking and to-do application that organises notes and lists into notebooks. Prior to 3.7.2, Joplin Server\u0027s UserModel.ssoLogin() returns an existing account matched by an IdP-asserted email without checking the account\u0027s is_external flag. In deployments using mixed local and SAML authentication, an attacker whose IdP session can assert a local user\u0027s email can pass POST /api/saml, receive a session for that local account, and access or modify the victim\u0027s notes, files, and settings without knowing the local password. This issue is fixed in version 3.7.2.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-290\", \"description\": \"CWE-290: Authentication Bypass by Spoofing\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-09-21T21:14:31.267Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-55210\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-22T13:07:10.486Z\", \"dateReserved\": \"2026-06-16T16:16:32.627Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-09-21T21:14:31.267Z\", \"assignerShortName\": \"GitHub_M\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
Loading…
Loading…