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CVE-2026-91851

MISP Dashboard Template ACL Bypass Due to VARCHAR-to-Integer Type Coercion in Permission Flag Comparison

5.3 Medium

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

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
None

Exploit likelihood

0.35%Up 0.1 points since Sep 15, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.3

MISP Dashboard Template ACL Bypass Due to VARCHAR-to-Integer Type Coercion in Permission Flag Comparison

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

Record
CVE-2026-91851
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-863, CWE-697
Updated
2026-11-02
EUVDEUVD-2026-78333 5.3

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

Record
EUVD-2026-78333
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-x44q-9w6w-p22f 5.3

Affected versions of MISP incorrectly filter dashboard templates that are restricted to a...

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

Record
GHSA-x44q-9w6w-p22f
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/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
Weakness
CWE-697
Updated
2026-11-02
NVD 5.3

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

Record
CVE-2026-91851
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/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
Weakness
CWE-697, CWE-863
Updated
2026-11-02
OSV 5.3

MISP Dashboard Template ACL Bypass Due to VARCHAR-to-Integer Type Coercion in Permission Flag Comparison

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

Record
CVE-2026-91851
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-697, CWE-863
Updated
2026-11-02

Affected products

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-91851 is a medium vulnerability (CVSS 5.3) in Misp, published September 15, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.35%, the 28th percentile. No source names a fixed version.

References

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