CVE-2026-67281 (GCVE-0-2026-67281)
Vulnerability from cvelistv5 – Published: 2026-09-05 20:00 – Updated: 2026-09-05 20:40
VLAI
EPSS
VEX
Title
Unauthenticated file read in Mikrotik RouterOS
Summary
RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocated session retains a stale uninitialized principal pointer used for file authorization. An unauthenticated attacker can prepare the allocator so that the file-serving path dereferences this pointer with sufficient rights, then supply parent-directory components in an encrypted URI to escape the WebFig file namespace and disclose root-owned files, including configuration stores containing credentials.This issue was fixed in versions: 6.49.21 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)
Severity
CWE
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve | third-party-advisory |
| https://cert.pl/en/posts/2026/09/vulnerabilities-… | technical-description |
| https://npratley.net/reversing-mikrotiks-silent-p… | exploit |
| https://mikrotik.com/supportsec/september-2026-vu… | vendor-advisory |
| https://forum.mikrotik.com/t/6-49-21-long-term-is… | release-notes |
| https://forum.mikrotik.com/t/7-23-4-long-term-is-… | release-notes |
| https://forum.mikrotik.com/t/7-24-2-stable-is-rel… | release-notes |
Impacted products
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"affected": [
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"product": "RouterOS",
"vendor": "Mikrotik",
"versions": [
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"status": "affected",
"version": "7.24",
"versionType": "custom"
},
{
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"status": "affected",
"version": "7.0.0",
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},
{
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"version": "6.0.0",
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}
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"criteria": "cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.25.1",
"versionStartIncluding": "0.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "OR"
}
],
"credits": [
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"lang": "en",
"type": "finder",
"value": "S\u0142awomir Rozbicki (CERT.PL)"
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"descriptions": [
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"value": "RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocated session retains a stale uninitialized principal pointer used for file authorization. An unauthenticated attacker can prepare the allocator so that the file-serving path dereferences this pointer with sufficient rights, then supply parent-directory components in an encrypted URI to escape the WebFig file namespace and disclose root-owned files, including configuration stores containing credentials.\u003cdiv\u003eThis issue was fixed in versions:\u0026nbsp;6.49.21 (Long-term),\u0026nbsp;7.23.4 (Long-term)\u0026nbsp;and\u0026nbsp;7.24.2 (Stable)\u003c/div\u003e"
}
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}
],
"metrics": [
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
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"attackVector": "NETWORK",
"baseScore": 8.7,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
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"subConfidentialityImpact": "NONE",
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"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
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"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
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"description": "CWE-22 Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
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"type": "CWE"
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],
"providerMetadata": {
"dateUpdated": "2026-09-05T20:40:58.915Z",
"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
"shortName": "CERT-PL"
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"references": [
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"tags": [
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"url": "https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve"
},
{
"tags": [
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"url": "https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/"
},
{
"tags": [
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],
"url": "https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/"
},
{
"tags": [
"vendor-advisory"
],
"url": "https://mikrotik.com/supportsec/september-2026-vulnerability/"
},
{
"tags": [
"release-notes"
],
"url": "https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802"
},
{
"tags": [
"release-notes"
],
"url": "https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801"
},
{
"tags": [
"release-notes"
],
"url": "https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800"
}
],
"source": {
"discovery": "INTERNAL"
},
"title": "Unauthenticated file read in Mikrotik RouterOS",
"x_generator": {
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"cveMetadata": {
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"assignerShortName": "CERT-PL",
"cveId": "CVE-2026-67281",
"datePublished": "2026-09-05T20:00:58.457Z",
"dateReserved": "2026-07-29T11:59:30.538Z",
"dateUpdated": "2026-09-05T20:40:58.915Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-67281",
"date": "2026-09-06",
"epss": "0.00461",
"percentile": "0.38416"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-67281\",\"sourceIdentifier\":\"cvd@cert.pl\",\"published\":\"2026-09-05T20:17:18.547\",\"lastModified\":\"2026-09-05T21:16:50.723\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocated session retains a stale uninitialized principal pointer used for file authorization. An unauthenticated attacker can prepare the allocator so that the file-serving path dereferences this pointer with sufficient rights, then supply parent-directory components in an encrypted URI to escape the WebFig file namespace and disclose root-owned files, including configuration stores containing credentials.This issue was fixed in versions:\u00a06.49.21 (Long-term),\u00a07.23.4 (Long-term)\u00a0and\u00a07.24.2 (Stable)\"}],\"affected\":[{\"source\":\"cvd@cert.pl\",\"affectedData\":[{\"vendor\":\"Mikrotik\",\"product\":\"RouterOS\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"7.24\",\"lessThan\":\"7.24.2\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"7.0.0\",\"lessThan\":\"7.23.4\",\"versionType\":\"custom\",\"status\":\"affected\"},{\"version\":\"6.0.0\",\"lessThan\":\"6.49.21\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":8.7,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"HIGH\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"cvd@cert.pl\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-22\"},{\"lang\":\"en\",\"value\":\"CWE-824\"}]}],\"references\":[{\"url\":\"https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://mikrotik.com/supportsec/september-2026-vulnerability/\",\"source\":\"cvd@cert.pl\"},{\"url\":\"https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/\",\"source\":\"cvd@cert.pl\"}]}}"
}
}
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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.
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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.
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