CVE-2026-91851 (GCVE-0-2026-91851)
Vulnerability from cvelistv5 – Published: 2026-09-15 08:50 – Updated: 2026-09-15 13:29
VLAI
EPSS
VEX
Title
MISP Dashboard Template ACL Bypass Due to VARCHAR-to-Integer Type Coercion in Permission Flag Comparison
Summary
Affected versions of MISP incorrectly filter dashboard templates that are restricted to a specific permission flag.
DashboardsController::listTemplates() allowed a template when either:
- its restrict_to_permission_flag matched one of the current user’s permission flags, or
- restrict_to_permission_flag equaled integer 0
However, restrict_to_permission_flag is a varchar. MySQL therefore performed numeric coercion when comparing the column against integer 0. Strings such as perm_site_admin convert numerically to zero, making expressions such as perm_site_admin = 0 evaluate true and causing the “unrestricted” branch to match permission-restricted templates as well.
Version affected: ≤2.5.45
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 13:29 UTC
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/MISP/MISP/commit/245b8d63a | patch |
Impacted products
GCVE extensions
AI-generated
Confidence: medium
Model
qwen3.8:27b
advisory
bcp-05-x-01bcp-05-x-02
AI involvement
GCVE-BCP-05-X-01
Draft vulnerability metadata was generated from a git-format patch using an Ollama-hosted language model. Human validation is required before publication.
ai-computer-assisted:llm-generatedai-computer-assisted:classification
| Model | Source | Identifier |
|---|---|---|
| qwen3.8:27b | ollama | qwen3.8:27b |
Patch provenance
GCVE-BCP-05-X-02
- Generator
-
patch2vuln.pyon 2026-09-15 08:40 - Model
qwen3.8:27b- Input
-
https://github.com/MISP/MISP/commit/245b8d63a.patch
ac03cd1103d5… - Confidence
- medium
| Commit | Subject | Patch SHA-256 |
|---|---|---|
245b8d63a379
|
fix: [acl] Compare the dashboard template permission flag as | ac03cd1103d5… |
Fix summary
The fix corrects the type mismatch in the permission flag comparison by replacing the integer literal 0 with the explicit string values '' and '0', which are the actual database values representing an unrestricted dashboard template. This ensures MySQL performs a proper string-to-string comparison, so only rows genuinely marked as unrestricted are returned, restoring the intended per-permission-level access control on dashboard templates.
Patch summary
In app/Controller/DashboardsController.php, the listTemplates() method's query condition was changed from ['Dashboard.restrict_to_permission_flag' => 0] to ['Dashboard.restrict_to_permission_flag' => ['', '0']]. A multi-line comment was added explaining that restrict_to_permission_flag is a VARCHAR column and that comparing it to integer 0 causes MySQL to coerce the column, making the clause a no-op. The two values that actually represent unrestricted access are the empty string (column default) and the string '0' (posted by the save form).
CVSS rationale
The vulnerability is exploitable over the network (AV:N) via the MISP web interface with low attack complexity (AC:L) and no attack target manipulation (AT:N). It requires a low-privilege authenticated user (PR:L) and no user interaction (UI:N). The impact is limited to confidentiality (VC:L) as restricted dashboard template definitions are disclosed to unauthorized users; there is no integrity or availability impact (VI:N, VA:N) and no secondary effects (SC:N, SI:N, SA:N). The severity is moderate because the disclosed data is dashboard template metadata rather than raw threat intelligence, but it still represents a breach of the intended access control boundary.
Weakness rationale
- CWE-863 The permission-based filter on dashboard templates was effectively bypassed because the type-coerced comparison matched all rows, allowing any authenticated user to access templates restricted to higher-privilege roles. The authorization check was present in code but did not function correctly.
- CWE-697 The root cause is a comparison between a VARCHAR column and an integer literal. MySQL's implicit type coercion caused the comparison to evaluate to TRUE for all non-numeric string values, making the intended filter a no-op. This is a classic incorrect comparison due to type mismatch.
Assumptions to verify
- The affected version range is inferred from the tag_version_boundary (v2.5.46 with 200 commits after fix); no explicit affected or fixed version is stated in the patch metadata.
- The vulnerability requires an authenticated MISP user with any role; the exact minimum privilege level needed to access the listTemplates endpoint is not specified in the patch.
- The impact is assessed as Low confidentiality because the disclosed data is dashboard template definitions (layout, widget configuration) rather than raw threat intelligence or user credentials.
- The MySQL type-coercion behavior described in the commit message and code comments is assumed to be accurate for the MySQL versions supported by MISP.
Model comparison
Selected qwen3.8:27b
by deterministic-consensus-v1
The selected result is closest to model consensus; this heuristic does not establish factual correctness and human review remains required.
| Model | Score | Agreement | Confidence | Assumptions |
|---|---|---|---|---|
qwen3.8:27b |
6 | 9 | medium | 4 |
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"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-91851\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-15T13:29:22.086413Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-15T13:29:48.856Z\"}}], \"cna\": {\"title\": \"MISP Dashboard Template ACL Bypass Due to VARCHAR-to-Integer Type Coercion in Permission Flag Comparison\", \"x_gcve\": [{\"vulnId\": \"GCVE-1-2026-20010\", \"extensions\": {\"bcp-05-x-01\": {\"ai_annotations\": [{\"tags\": [\"ai-computer-assisted:llm-generated\", \"ai-computer-assisted:classification\"], \"scope\": \"record\", \"models\": [{\"name\": \"qwen3.8:27b\", \"source\": \"ollama\", \"gna_source\": 1, \"identifier\": \"qwen3.8:27b\"}], \"ai_level\": \"generated\", \"gna_source\": 1, \"description\": \"Draft vulnerability metadata was generated from a git-format patch using an Ollama-hosted language model. Human validation is required before publication.\", \"review_status\": \"review\"}]}, \"bcp-05-x-02\": {\"x_patch2vuln\": {\"draft\": false, \"model\": \"qwen3.8:27b\", \"commit\": \"245b8d63a3794d048fb88275512fa0d32981f0b8\", \"source\": \"https://github.com/MISP/MISP/commit/245b8d63a.patch\", \"credits\": [{\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"iglocska\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Claude Opus 5 (1M context)\"}], \"patches\": [{\"commit\": \"245b8d63a3794d048fb88275512fa0d32981f0b8\", \"source\": \"https://github.com/MISP/MISP/commit/245b8d63a.patch\", \"subject\": \"fix: [acl] Compare the dashboard template permission flag as\", \"sourceUrl\": \"https://github.com/MISP/MISP/commit/245b8d63a.patch\", \"patchSha256\": \"ac03cd1103d5fb0998c2406836df41d3449e5a5d6a0a5d2ffc77685eba48e188\"}], \"subject\": \"fix: [acl] Compare the dashboard template permission flag as\", \"generator\": \"patch2vuln.py\", \"confidence\": \"medium\", \"fixSummary\": \"The fix corrects the type mismatch in the permission flag comparison by replacing the integer literal 0 with the explicit string values \u0027\u0027 and \u00270\u0027, which are the actual database values representing an unrestricted dashboard template. This ensures MySQL performs a proper string-to-string comparison, so only rows genuinely marked as unrestricted are returned, restoring the intended per-permission-level access control on dashboard templates.\", \"assumptions\": [\"The affected version range is inferred from the tag_version_boundary (v2.5.46 with 200 commits after fix); no explicit affected or fixed version is stated in the patch metadata.\", \"The vulnerability requires an authenticated MISP user with any role; the exact minimum privilege level needed to access the listTemplates endpoint is not specified in the patch.\", \"The impact is assessed as Low confidentiality because the disclosed data is dashboard template definitions (layout, widget configuration) rather than raw threat intelligence or user credentials.\", \"The MySQL type-coercion behavior described in the commit message and code comments is assumed to be accurate for the MySQL versions supported by MISP.\"], \"generatedAt\": \"2026-09-15T08:40:44.690048Z\", \"patchSha256\": \"ac03cd1103d5fb0998c2406836df41d3449e5a5d6a0a5d2ffc77685eba48e188\", \"patchSummary\": \"In app/Controller/DashboardsController.php, the listTemplates() method\u0027s query condition was changed from [\u0027Dashboard.restrict_to_permission_flag\u0027 =\u003e 0] to [\u0027Dashboard.restrict_to_permission_flag\u0027 =\u003e [\u0027\u0027, \u00270\u0027]]. A multi-line comment was added explaining that restrict_to_permission_flag is a VARCHAR column and that comparing it to integer 0 causes MySQL to coerce the column, making the clause a no-op. The two values that actually represent unrestricted access are the empty string (column default) and the string \u00270\u0027 (posted by the save form).\", \"cvssRationale\": \"The vulnerability is exploitable over the network (AV:N) via the MISP web interface with low attack complexity (AC:L) and no attack target manipulation (AT:N). It requires a low-privilege authenticated user (PR:L) and no user interaction (UI:N). The impact is limited to confidentiality (VC:L) as restricted dashboard template definitions are disclosed to unauthorized users; there is no integrity or availability impact (VI:N, VA:N) and no secondary effects (SC:N, SI:N, SA:N). The severity is moderate because the disclosed data is dashboard template metadata rather than raw threat intelligence, but it still represents a breach of the intended access control boundary.\", \"patchTruncated\": false, \"modelComparison\": {\"rankings\": [{\"model\": \"qwen3.8:27b\", \"score\": 6, \"confidence\": \"medium\", \"agreementScore\": 9, \"assumptionCount\": 4}], \"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-863\", \"rationale\": \"The permission-based filter on dashboard templates was effectively bypassed because the type-coerced comparison matched all rows, allowing any authenticated user to access templates restricted to higher-privilege roles. The authorization check was present in code but did not function correctly.\"}, {\"cweId\": \"CWE-697\", \"rationale\": \"The root cause is a comparison between a VARCHAR column and an integer literal. MySQL\u0027s implicit type coercion caused the comparison to evaluate to TRUE for all non-numeric string values, making the intended filter a no-op. This is a classic incorrect comparison due to type mismatch.\"}], \"tagVersionBoundary\": {\"tag\": \"v2.5.46\", \"version\": \"2.5.46\", \"repository\": \"https://github.com/MISP/MISP\", \"version_type\": \"semver\", \"commits_after_fix\": 200}}}}, \"recordType\": \"advisory\"}], \"credits\": [{\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"iglocska\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Claude Opus 5 (1M context)\"}], \"impacts\": [{\"capecId\": \"CAPEC-1\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-1 Accessing Functionality Not Properly Constrained by ACLs\"}]}], \"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\"}]}], \"affected\": [{\"repo\": \"https://github.com/MISP/MISP\", \"vendor\": \"MISP\", \"modules\": [\"DashboardsController\"], \"product\": \"MISP\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.5.46\", \"versionType\": \"semver\"}], \"programFiles\": [\"app/Controller/DashboardsController.php\"]}], \"solutions\": [{\"lang\": \"en\", \"value\": \"The fix corrects the type mismatch in the permission flag comparison by replacing the integer literal 0 with the explicit string values \u0027\u0027 and \u00270\u0027, which are the actual database values representing an unrestricted dashboard template. This ensures MySQL performs a proper string-to-string comparison, so only rows genuinely marked as unrestricted are returned, restoring the intended per-permission-level access control on dashboard templates.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe fix corrects the type mismatch in the permission flag comparison by replacing the integer literal 0 with the explicit string values \u0027\u0027 and \u00270\u0027, which are the actual database values representing an unrestricted dashboard template. This ensures MySQL performs a proper string-to-string comparison, so only rows genuinely marked as unrestricted are returned, restoring the intended per-permission-level access control on dashboard templates.\u003c/p\u003e\", \"base64\": false}]}], \"references\": [{\"url\": \"https://github.com/MISP/MISP/commit/245b8d63a\", \"name\": \"Security patch\", \"tags\": [\"patch\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Affected versions of MISP incorrectly filter dashboard templates that are restricted to a specific permission flag.\\n\\n\\nDashboardsController::listTemplates() allowed a template when either:\\n\\n\\n\\n\\u2003-\\u00a0its restrict_to_permission_flag matched one of the current user\\u2019s permission flags, or\\n\\n\\u2003-\\u00a0restrict_to_permission_flag equaled integer 0\\n\\n\\n\\n\\n\\n\\nHowever, restrict_to_permission_flag is a varchar. MySQL therefore performed numeric coercion when comparing the column against integer 0. Strings such as perm_site_admin convert numerically to zero, making expressions such as perm_site_admin = 0 evaluate true and causing the \\u201cunrestricted\\u201d branch to match permission-restricted templates as well.\\n\\n\\n\\nVersion affected: \\u22642.5.45\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003e\u003c/p\u003e\u003cp\u003eAffected versions of MISP incorrectly filter dashboard templates that are restricted to a specific permission flag.\u003c/p\u003e\\n\u003cp\u003e\u003ccode\u003eDashboardsController::listTemplates()\u003c/code\u003e allowed a template when either:\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cdiv\u003e\\u2003-\u0026nbsp;its \u003ccode\u003erestrict_to_permission_flag\u003c/code\u003e matched one of the current user\\u2019s permission flags, or\u003c/div\u003e\u003cdiv\u003e\\u2003-\u0026nbsp;\u003ccode\u003erestrict_to_permission_flag\u003c/code\u003e equaled integer \u003ccode\u003e0\u003c/code\u003e\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003ccode\u003e\u003c/code\u003e\u003c/div\u003e\u003cp\u003e\u003ccode\u003e\u003c/code\u003e\u003c/p\u003e\u003cp\u003eHowever, \u003ccode\u003erestrict_to_permission_flag\u003c/code\u003e is a \u003ccode\u003evarchar\u003c/code\u003e. MySQL therefore performed numeric coercion when comparing the column against integer \u003ccode\u003e0\u003c/code\u003e. Strings such as \u003ccode\u003eperm_site_admin\u003c/code\u003e convert numerically to zero, making expressions such as \u003ccode\u003eperm_site_admin = 0\u003c/code\u003e evaluate true and causing the \\u201cunrestricted\\u201d branch to match permission-restricted templates as well.\u003c/p\u003e\u003cp\u003e\u003c/p\u003e\u003cp\u003eVersion affected: \\u22642.5.45\u003cbr\u003e\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-863\", \"description\": \"CWE-863 Incorrect Authorization\"}]}, {\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-697\", \"description\": \"CWE-697 Incorrect Comparison\"}]}], \"providerMetadata\": {\"orgId\": \"5a6e4751-2f3f-4070-9419-94fb35b644e8\", \"shortName\": \"CIRCL\", \"dateUpdated\": \"2026-09-15T08:50:01.513Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-91851\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T13:29:55.108Z\", \"dateReserved\": \"2026-09-15T08:49:59.734Z\", \"assignerOrgId\": \"5a6e4751-2f3f-4070-9419-94fb35b644e8\", \"datePublished\": \"2026-09-15T08:50:01.513Z\", \"assignerShortName\": \"CIRCL\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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