CVE-2026-55168 (GCVE-0-2026-55168)
Vulnerability from cvelistv5 – Published: 2026-08-21 20:31 – Updated: 2026-08-25 17:01
VLAI
EPSS
VEX
Title
Runtipi: Authenticated arbitrary file write via backup restore symlink planting
Summary
Runtipi is a personal homeserver orchestrator. In 4.10.0 and earlier, Runtipi accepts symbolic links from an attacker-controlled backup archive and copies them into live application paths during the backup restore flow. An authenticated attacker can plant user-config/app.env as a symlink to an arbitrary reachable path and then send PUT /api/user-config/demoapp3:_user with attacker-controlled appEnv content. FilesystemService.writeTextFile() follows the planted link, allowing content to be written outside the intended restore and user-config directory boundary with Runtipi process permissions. This issue is fixed in version 4.10.1.
Severity
6.5 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 17:00 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/runtipi/runtipi/security/advis… | x_refsource_CONFIRM |
| https://github.com/runtipi/runtipi/pull/2606 | x_refsource_MISC |
| https://github.com/runtipi/runtipi/commit/df529a2… | x_refsource_MISC |
| https://github.com/runtipi/runtipi/releases/tag/v4.10.1 | x_refsource_MISC |
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-55168",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-25T17:00:46.475021Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-08-25T17:01:52.501Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "runtipi",
"vendor": "runtipi",
"versions": [
{
"status": "affected",
"version": "\u003c 4.10.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Runtipi is a personal homeserver orchestrator. In 4.10.0 and earlier, Runtipi accepts symbolic links from an attacker-controlled backup archive and copies them into live application paths during the backup restore flow. An authenticated attacker can plant user-config/app.env as a symlink to an arbitrary reachable path and then send PUT /api/user-config/demoapp3:_user with attacker-controlled appEnv content. FilesystemService.writeTextFile() follows the planted link, allowing content to be written outside the intended restore and user-config directory boundary with Runtipi process permissions. This issue is fixed in version 4.10.1."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-59",
"description": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-61",
"description": "CWE-61: UNIX Symbolic Link (Symlink) Following",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-21T20:31:38.124Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7"
},
{
"name": "https://github.com/runtipi/runtipi/pull/2606",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/runtipi/runtipi/pull/2606"
},
{
"name": "https://github.com/runtipi/runtipi/commit/df529a211b05f3a0007b209b6c337f8c1942619c",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/runtipi/runtipi/commit/df529a211b05f3a0007b209b6c337f8c1942619c"
},
{
"name": "https://github.com/runtipi/runtipi/releases/tag/v4.10.1",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/runtipi/runtipi/releases/tag/v4.10.1"
}
],
"source": {
"advisory": "GHSA-wcrf-g9p9-2wg7",
"discovery": "UNKNOWN"
},
"title": "Runtipi: Authenticated arbitrary file write via backup restore symlink planting"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-55168",
"datePublished": "2026-08-21T20:31:38.124Z",
"dateReserved": "2026-06-16T15:13:28.166Z",
"dateUpdated": "2026-08-25T17:01:52.501Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-55168",
"date": "2026-08-30",
"epss": "0.00528",
"percentile": "0.42565"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-55168\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-08-21T21:17:00.410\",\"lastModified\":\"2026-08-25T17:17:30.117\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Runtipi is a personal homeserver orchestrator. In 4.10.0 and earlier, Runtipi accepts symbolic links from an attacker-controlled backup archive and copies them into live application paths during the backup restore flow. An authenticated attacker can plant user-config/app.env as a symlink to an arbitrary reachable path and then send PUT /api/user-config/demoapp3:_user with attacker-controlled appEnv content. FilesystemService.writeTextFile() follows the planted link, allowing content to be written outside the intended restore and user-config directory boundary with Runtipi process permissions. This issue is fixed in version 4.10.1.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"runtipi\",\"product\":\"runtipi\",\"versions\":[{\"version\":\"\u003c 4.10.1\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.2,\"impactScore\":5.2}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-08-25T17:00:46.475021Z\",\"id\":\"CVE-2026-55168\",\"options\":[{\"exploitation\":\"poc\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-59\"},{\"lang\":\"en\",\"value\":\"CWE-61\"}]}],\"references\":[{\"url\":\"https://github.com/runtipi/runtipi/commit/df529a211b05f3a0007b209b6c337f8c1942619c\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/runtipi/runtipi/pull/2606\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/runtipi/runtipi/releases/tag/v4.10.1\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\"}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-55168\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-08-25T17:00:46.475021Z\"}}}], \"references\": [{\"url\": \"https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-08-25T17:01:15.851Z\"}}], \"cna\": {\"title\": \"Runtipi: Authenticated arbitrary file write via backup restore symlink planting\", \"source\": {\"advisory\": \"GHSA-wcrf-g9p9-2wg7\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"HIGH\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"runtipi\", \"product\": \"runtipi\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 4.10.1\"}]}], \"references\": [{\"url\": \"https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7\", \"name\": \"https://github.com/runtipi/runtipi/security/advisories/GHSA-wcrf-g9p9-2wg7\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/runtipi/runtipi/pull/2606\", \"name\": \"https://github.com/runtipi/runtipi/pull/2606\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/runtipi/runtipi/commit/df529a211b05f3a0007b209b6c337f8c1942619c\", \"name\": \"https://github.com/runtipi/runtipi/commit/df529a211b05f3a0007b209b6c337f8c1942619c\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/runtipi/runtipi/releases/tag/v4.10.1\", \"name\": \"https://github.com/runtipi/runtipi/releases/tag/v4.10.1\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Runtipi is a personal homeserver orchestrator. In 4.10.0 and earlier, Runtipi accepts symbolic links from an attacker-controlled backup archive and copies them into live application paths during the backup restore flow. An authenticated attacker can plant user-config/app.env as a symlink to an arbitrary reachable path and then send PUT /api/user-config/demoapp3:_user with attacker-controlled appEnv content. FilesystemService.writeTextFile() follows the planted link, allowing content to be written outside the intended restore and user-config directory boundary with Runtipi process permissions. This issue is fixed in version 4.10.1.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-59\", \"description\": \"CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-61\", \"description\": \"CWE-61: UNIX Symbolic Link (Symlink) Following\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-08-21T20:31:38.124Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-55168\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-25T17:01:52.501Z\", \"dateReserved\": \"2026-06-16T15:13:28.166Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-08-21T20:31:38.124Z\", \"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…