CVE-2026-104910 (GCVE-0-2026-104910)
Vulnerability from cvelistv5
Published
2026-10-02 16:01
Modified
2026-10-03 15:52
Severity ?
VLAI Severity ?
EPSS score ?
Summary
MISP contains an authorization bypass in the related events listing functionality. When a user requests the list of events correlated to a given event, the system retrieved related event metadata directly from the correlation table without re-validating the caller's access rights against each related event.
The correlation table stores a snapshot of the event's distribution level and sharing group at the time the correlation was created, and does not carry the published flag. As a result, events that the caller is not permitted to open—because they are unpublished, or because their distribution or sharing group has changed since the correlation was recorded—were still returned with their metadata (title, date, correlating value counts).
Preconditions:
- An authenticated user with access to at least one event in MISP.
- The existence of correlation entries linking that event to other events the user should not be able to view.
Impact:
- Unauthorized disclosure of event metadata (titles, dates, correlation counts) for events the user has no right to access.
- Potential reconnaissance of threat-intelligence event names and timelines across sharing groups.
Affected: MISP versions prior to the fix commit (2ffa97f05).
References
| URL | Tags | |
|---|---|---|
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The overall score reflects a low-severity information disclosure requiring authentication.\", \"capecRationale\": [{\"capecId\": \"CAPEC-126\", \"rationale\": \"The attacker leverages the trusted correlation relationship stored in the correlation table. The system treated the correlation entry as a sufficient authorization basis, but the snapshot data was stale and incomplete (missing published flag), allowing access to event metadata the caller should not see. This is the closest CAPEC to the pattern of relying on a trusted data source that does not reflect current authorization state. Uncertainty: no CAPEC perfectly describes \u0027stale authorization snapshot in a join table\u0027; CAPEC-126 is the best available match.\"}], \"patchTruncated\": false, \"modelComparison\": {\"rankings\": [{\"model\": \"qwen3.8:27b\", \"score\": 6, \"confidence\": \"medium\", \"agreementScore\": 11, \"assumptionCount\": 6}], \"selectedModel\": \"qwen3.8:27b\", \"selectionMethod\": \"deterministic-consensus-v1\", \"selectionNotice\": \"The selected result is closest to model consensus; this heuristic does not establish factual correctness and human review remains required.\"}, \"weaknessRationale\": [{\"cweId\": \"CWE-862\", \"rationale\": \"The related events query did not apply the caller\u0027s per-event authorization checks (published status, distribution, sharing group). The system relied on a stale snapshot in the correlation table instead of re-validating access, effectively omitting the authorization step for the returned events.\"}, {\"cweId\": \"CWE-285\", \"rationale\": \"Even though some authorization existed (via the correlation table snapshot), it was based on outdated data and lacked the published flag check, making the authorization decision incorrect for events whose access parameters had changed or that were unpublished.\"}], \"tagVersionBoundary\": {\"tag\": \"v2.5.48\", \"version\": \"2.5.48\", \"repository\": \"https://github.com/MISP/MISP\", \"version_type\": \"semver\", \"commits_after_fix\": 50}}}, \"bcp-05-x-03\": {\"x_timeline\": {\"events\": [{\"id\": \"evt-fix-developed-1\", \"type\": \"fix-developed\", \"timestamp\": \"2026-09-22T13:14:32Z\", \"references\": [\"https://github.com/MISP/MISP/commit/2ffa97f05.patch\"], \"description\": \"Corrective change authored (2ffa97f0526cd6579b91a4dea560f6246ecbe108): fix: [security] Scope the related event list to what the\"}]}}}, \"recordType\": \"advisory\"}], \"credits\": [{\"lang\": \"en\", \"type\": \"reporter\", \"value\": \"Wenhao Wu\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"iglocska\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Claude Opus 5 (1M context)\"}], \"impacts\": [{\"capecId\": \"CAPEC-126\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-126 Leverage Trusted Relationship\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 5.3, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"valueDensity\": \"NOT_DEFINED\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"LOW\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"NONE\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"LOW\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}, {\"other\": {\"type\": \"SSVC\", \"content\": {\"role\": \"Supplier\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-02T15:59:27Z\"}}, \"format\": \"SSVC\", \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/MISP/MISP\", \"vendor\": \"MISP\", \"modules\": [\"EventsController (viewRelatedEvents)\", \"Event model (getRelatedEvents)\"], \"product\": \"MISP\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.5.48\", \"versionType\": \"semver\"}], \"programFiles\": [\"app/Controller/EventsController.php\", \"app/Model/Event.php\"]}], \"solutions\": [{\"lang\": \"en\", \"value\": \"The fix enforces proper per-event authorization on the related events query by applying the user\u0027s full access-control conditions (including published status, distribution level, and sharing group membership) to the event lookup, rather than relying solely on the stale distribution snapshot stored in the correlation table. This ensures that only events the caller is currently permitted to read are returned in the related events list.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe fix enforces proper per-event authorization on the related events query by applying the user\u0027s full access-control conditions (including published status, distribution level, and sharing group membership) to the event lookup, rather than relying solely on the stale distribution snapshot stored in the correlation table. This ensures that only events the caller is currently permitted to read are returned in the related events list.\u003c/p\u003e\", \"base64\": false}]}], \"references\": [{\"url\": \"https://github.com/MISP/MISP/commit/2ffa97f05\", \"name\": \"Security patch\", \"tags\": [\"patch\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"MISP contains an authorization bypass in the related events listing functionality. When a user requests the list of events correlated to a given event, the system retrieved related event metadata directly from the correlation table without re-validating the caller\u0027s access rights against each related event.\\n\\nThe correlation table stores a snapshot of the event\u0027s distribution level and sharing group at the time the correlation was created, and does not carry the published flag. As a result, events that the caller is not permitted to open\\u2014because they are unpublished, or because their distribution or sharing group has changed since the correlation was recorded\\u2014were still returned with their metadata (title, date, correlating value counts).\\n\\nPreconditions:\\n\\n- An authenticated user with access to at least one event in MISP.\\n\\n- The existence of correlation entries linking that event to other events the user should not be able to view.\\n\\nImpact:\\n\\n- Unauthorized disclosure of event metadata (titles, dates, correlation counts) for events the user has no right to access.\\n\\n- Potential reconnaissance of threat-intelligence event names and timelines across sharing groups.\\n\\nAffected: MISP versions prior to the fix commit (2ffa97f05).\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eMISP contains an authorization bypass in the related events listing functionality. When a user requests the list of events correlated to a given event, the system retrieved related event metadata directly from the correlation table without re-validating the caller\u0027s access rights against each related event.\u003c/p\u003e\u003cp\u003eThe correlation table stores a snapshot of the event\u0027s distribution level and sharing group at the time the correlation was created, and does not carry the published flag. As a result, events that the caller is not permitted to open\\u2014because they are unpublished, or because their distribution or sharing group has changed since the correlation was recorded\\u2014were still returned with their metadata (title, date, correlating value counts).\u003c/p\u003e\u003cp\u003ePreconditions:\u003c/p\u003e\u003cp\u003e- An authenticated user with access to at least one event in MISP.\u003c/p\u003e\u003cp\u003e- The existence of correlation entries linking that event to other events the user should not be able to view.\u003c/p\u003e\u003cp\u003eImpact:\u003c/p\u003e\u003cp\u003e- Unauthorized disclosure of event metadata (titles, dates, correlation counts) for events the user has no right to access.\u003c/p\u003e\u003cp\u003e- Potential reconnaissance of threat-intelligence event names and timelines across sharing groups.\u003c/p\u003e\u003cp\u003eAffected: MISP versions prior to the fix commit (2ffa97f05).\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-862\", \"description\": \"CWE-862 Missing Authorization\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-285\", \"description\": \"CWE-285 Improper Authorization\"}]}], \"providerMetadata\": {\"orgId\": \"5a6e4751-2f3f-4070-9419-94fb35b644e8\", \"shortName\": \"CIRCL\", \"dateUpdated\": \"2026-10-02T16:01:32.781Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-104910\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-03T15:52:56.095Z\", \"dateReserved\": \"2026-10-02T16:01:26.599Z\", \"assignerOrgId\": \"5a6e4751-2f3f-4070-9419-94fb35b644e8\", \"datePublished\": \"2026-10-02T16:01:32.781Z\", \"assignerShortName\": \"CIRCL\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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