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CVE-2026-46716

Nezha Monitoring: RoleMember can run shell on every server (cross-tenant RCE) via POST /api/v1/cron

9.9 CriticalPublic exploitFix available

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.4.0 to before version 2.0.8, a RoleMember user can create a scheduled cron task with Cover=CronCoverAll, Servers=[] and an arbitrary Command. At every tick of the scheduler, the dashboard pushes that command to every server in the global ServerShared map — including servers that belong to other tenants (admin's servers, other members' servers). Each agent runs the command and returns the output, which is then sent to the attacker's own NotificationGroup → attacker-controlled webhook. This issue has been patched in version 2.0.8.

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
High
Integrity
High
Availability
High

Exploit likelihood

0.43%Up 0.4 points since Jun 12, 2026
90%50%10%1%

What each source reports

CVE List Score used 9.9

Nezha Monitoring: RoleMember can run shell on every server (cross-tenant RCE) via POST /api/v1/cron

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.4.0 to before version 2.0.8, a RoleMember user can create a scheduled cron task with Cover=CronCoverAll, Servers=[] and an arbitrary Command. At every tick of the scheduler, the dashboard pushes that command to every server in the global ServerShared map — including servers that belong to other tenants (admin's servers, other members' servers). Each agent runs the command and returns the output, which is then sent to the attacker's own NotificationGroup → attacker-controlled webhook. This issue has been patched in version 2.0.8.

Record
CVE-2026-46716
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-78, CWE-269, CWE-862
Updated
2026-11-02
EUVDEUVD-2026-36591 9.9

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.4.0 to before version 2.0.8, a RoleMember user can create a scheduled cron task with Cover=CronCoverAll, Servers=[] and an arbitrary Command. At every tick of the scheduler, the dashboard pushes that command to every server in the global ServerShared map — including servers that belong to other tenants (admin's servers, other members' servers). Each agent runs the command and returns the output, which is then sent to the attacker's own NotificationGroup → attacker-controlled webhook. This issue has been patched in version 2.0.8.

Record
EUVD-2026-36591
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-99gv-2m7h-3hh9 9.9

Nezha Monitoring: RoleMember can run shell on every server (cross-tenant RCE) via POST /api/v1/cron

Summary

nezha's dashboard supports two user roles: RoleAdmin (Role==0) and RoleMember (Role==1). The cron routes POST /api/v1/cron and PATCH /api/v1/cron/:id are wired through commonHandler (any authenticated user) rather than adminHandler, and the per-server permission check on cron creation has a vacuous-true bypass.

A RoleMember user can create a scheduled cron task with Cover=CronCoverAll, Servers=[] and an arbitrary Command. At every tick of the scheduler, the dashboard pushes that command to every server in the global ServerShared map — including servers that belong to other tenants (admin's servers, other members' servers). Each agent runs the command and returns the output, which is then sent to the attacker's own NotificationGroup → attacker-controlled webhook.

Net effect: any RoleMember (including a self-bound OAuth2 user, if the dashboard has OAuth2 configured) gets pre-validated cross-tenant RCE on every nezha-monitored host in the deployment.

Affected versions

Commit 50dc8e660326b9f22990898142c58b7a5312b42a and earlier on master.

The auth gate

// cmd/dashboard/controller/controller.go:131-135
auth.GET("/cron", listHandler(listCron))
auth.POST("/cron", commonHandler(createCron))                    // <-- commonHandler, not adminHandler
auth.PATCH("/cron/:id", commonHandler(updateCron))               // <-- ditto
auth.GET("/cron/:id/manual", commonHandler(manualTriggerCron))
auth.POST("/batch-delete/cron", commonHandler(batchDeleteCron))

Compare with /user (adminHandler-gated). commonHandler (controller.go:214-218) only requires JWT auth — any role passes.

The vacuous-true permission bypass

// cmd/dashboard/controller/cron.go:45-85
func createCron(c *gin.Context) (uint64, error) {
    var cf model.CronForm
    var cr model.Cron
    if err := c.ShouldBindJSON(&cf); err != nil { return 0, err }

    // BUG: empty cf.Servers iterates zero items, returns true vacuously.
    if !singleton.ServerShared.CheckPermission(c, slices.Values(cf.Servers)) {
        return 0, singleton.Localizer.ErrorT("permission denied")
    }

    cr.UserID = getUid(c)
    cr.TaskType = cf.TaskType
    cr.Name = cf.Name
    cr.Scheduler = cf.Scheduler
    cr.Command = cf.Command          // <-- attacker-controlled shell
    cr.Servers = cf.Servers          // <-- empty []
    cr.PushSuccessful = cf.PushSuccessful
    cr.NotificationGroupID = cf.NotificationGroupID
    cr.Cover = cf.Cover              // <-- CronCoverAll = 1

    if cr.TaskType == model.CronTypeCronTask && cr.Cover == model.CronCoverAlertTrigger {
        return 0, singleton.Localizer.ErrorT("scheduled tasks cannot be triggered by alarms")
    }

    var err error
    if cf.TaskType == model.CronTypeCronTask {
        if cr.CronJobID, err = singleton.CronShared.AddFunc(cr.Scheduler, singleton.CronTrigger(&cr)); err != nil {
            return 0, err
        }
    }

    if err = singleton.DB.Create(&cr).Error; err != nil {
        return 0, newGormError("%v", err)
    }

    singleton.CronShared.Update(&cr)
    return cr.ID, nil
}

ServerShared.CheckPermission (singleton.go:249-261) iterates idList; with cf.Servers == [], the for-range runs zero times and returns true. So a member can submit a cron with Servers=[] and skip the permission check entirely.

The cross-tenant fanout sink

// service/singleton/crontask.go:133-181
func CronTrigger(cr *model.Cron, triggerServer ...uint64) func() {
    crIgnoreMap := make(map[uint64]bool)
    for _, server := range cr.Servers {
        crIgnoreMap[server] = true
    }
    return func() {
        if cr.Cover == model.CronCoverAlertTrigger {
            // ... (alert-only path; not used here)
            return
        }

        // BUG: iterates EVERY server in global state, no per-server permission check.
        for _, s := range ServerShared.Range {
            if cr.Cover == model.CronCoverAll && crIgnoreMap[s.ID] {
               …
Record
GHSA-99gv-2m7h-3hh9
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-78, CWE-269, CWE-862
Updated
2026-11-02
NVD 9.9

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.4.0 to before version 2.0.8, a RoleMember user can create a scheduled cron task with Cover=CronCoverAll, Servers=[] and an arbitrary Command. At every tick of the scheduler, the dashboard pushes that command to every server in the global ServerShared map — including servers that belong to other tenants (admin's servers, other members' servers). Each agent runs the command and returns the output, which is then sent to the attacker's own NotificationGroup → attacker-controlled webhook. This issue has been patched in version 2.0.8.

Record
CVE-2026-46716
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-78, CWE-269, CWE-862
Updated
2026-11-02
OSV 9.9

Nezha Monitoring: RoleMember can run shell on every server (cross-tenant RCE) via POST /api/v1/cron

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.4.0 to before version 2.0.8, a RoleMember user can create a scheduled cron task with Cover=CronCoverAll, Servers=[] and an arbitrary Command. At every tick of the scheduler, the dashboard pushes that command to every server in the global ServerShared map — including servers that belong to other tenants (admin's servers, other members' servers). Each agent runs the command and returns the output, which is then sent to the attacker's own NotificationGroup → attacker-controlled webhook. This issue has been patched in version 2.0.8.

Record
CVE-2026-46716
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-269, CWE-78, CWE-862
Updated
2026-11-02
OSVGHSA-99gv-2m7h-3hh9 9.9

Nezha Monitoring: RoleMember can run shell on every server (cross-tenant RCE) via POST /api/v1/cron

Summary

nezha's dashboard supports two user roles: RoleAdmin (Role==0) and RoleMember (Role==1). The cron routes POST /api/v1/cron and PATCH /api/v1/cron/:id are wired through commonHandler (any authenticated user) rather than adminHandler, and the per-server permission check on cron creation has a vacuous-true bypass.

A RoleMember user can create a scheduled cron task with Cover=CronCoverAll, Servers=[] and an arbitrary Command. At every tick of the scheduler, the dashboard pushes that command to every server in the global ServerShared map — including servers that belong to other tenants (admin's servers, other members' servers). Each agent runs the command and returns the output, which is then sent to the attacker's own NotificationGroup → attacker-controlled webhook.

Net effect: any RoleMember (including a self-bound OAuth2 user, if the dashboard has OAuth2 configured) gets pre-validated cross-tenant RCE on every nezha-monitored host in the deployment.

Affected versions

Commit 50dc8e660326b9f22990898142c58b7a5312b42a and earlier on master.

The auth gate

// cmd/dashboard/controller/controller.go:131-135
auth.GET("/cron", listHandler(listCron))
auth.POST("/cron", commonHandler(createCron))                    // <-- commonHandler, not adminHandler
auth.PATCH("/cron/:id", commonHandler(updateCron))               // <-- ditto
auth.GET("/cron/:id/manual", commonHandler(manualTriggerCron))
auth.POST("/batch-delete/cron", commonHandler(batchDeleteCron))

Compare with /user (adminHandler-gated). commonHandler (controller.go:214-218) only requires JWT auth — any role passes.

The vacuous-true permission bypass

// cmd/dashboard/controller/cron.go:45-85
func createCron(c *gin.Context) (uint64, error) {
    var cf model.CronForm
    var cr model.Cron
    if err := c.ShouldBindJSON(&cf); err != nil { return 0, err }

    // BUG: empty cf.Servers iterates zero items, returns true vacuously.
    if !singleton.ServerShared.CheckPermission(c, slices.Values(cf.Servers)) {
        return 0, singleton.Localizer.ErrorT("permission denied")
    }

    cr.UserID = getUid(c)
    cr.TaskType = cf.TaskType
    cr.Name = cf.Name
    cr.Scheduler = cf.Scheduler
    cr.Command = cf.Command          // <-- attacker-controlled shell
    cr.Servers = cf.Servers          // <-- empty []
    cr.PushSuccessful = cf.PushSuccessful
    cr.NotificationGroupID = cf.NotificationGroupID
    cr.Cover = cf.Cover              // <-- CronCoverAll = 1

    if cr.TaskType == model.CronTypeCronTask && cr.Cover == model.CronCoverAlertTrigger {
        return 0, singleton.Localizer.ErrorT("scheduled tasks cannot be triggered by alarms")
    }

    var err error
    if cf.TaskType == model.CronTypeCronTask {
        if cr.CronJobID, err = singleton.CronShared.AddFunc(cr.Scheduler, singleton.CronTrigger(&cr)); err != nil {
            return 0, err
        }
    }

    if err = singleton.DB.Create(&cr).Error; err != nil {
        return 0, newGormError("%v", err)
    }

    singleton.CronShared.Update(&cr)
    return cr.ID, nil
}

ServerShared.CheckPermission (singleton.go:249-261) iterates idList; with cf.Servers == [], the for-range runs zero times and returns true. So a member can submit a cron with Servers=[] and skip the permission check entirely.

The cross-tenant fanout sink

// service/singleton/crontask.go:133-181
func CronTrigger(cr *model.Cron, triggerServer ...uint64) func() {
    crIgnoreMap := make(map[uint64]bool)
    for _, server := range cr.Servers {
        crIgnoreMap[server] = true
    }
    return func() {
        if cr.Cover == model.CronCoverAlertTrigger {
            // ... (alert-only path; not used here)
            return
        }

        // BUG: iterates EVERY server in global state, no per-server permission check.
        for _, s := range ServerShared.Range {
            if cr.Cover == model.CronCoverAll && crIgnoreMap[s.ID] {
               …
Record
GHSA-99gv-2m7h-3hh9
CVSS 3.1
9.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-269, CWE-78, CWE-862
Updated
2026-11-02
OSVGO-2026-5282 No score

Nezha Monitoring: RoleMember can run shell on every server (cross-tenant RCE) via POST /api/v1/cron in github.com/nezhahq/nezha

Nezha Monitoring: RoleMember can run shell on every server (cross-tenant RCE) via POST /api/v1/cron in github.com/nezhahq/nezha

Record
GO-2026-5282
Updated
2026-11-02
OSVopenSUSE-SU-2026:21483-1 No score

Security update for govulncheck-vulndb

This update for govulncheck-vulndb fixes the following issues:

  • Update to version 0.0.20260723T184607 2026-07-23T18:46:07Z (jsc#PED-11136).

Go CVE Numbering Authority IDs added or updated with aliases:

  • GO-2026-4730 CVE-2026-33022 GHSA-cv4x-93xx-wgfj
  • GO-2026-4761 CVE-2026-33211 GHSA-j5q5-j9gm-2w5c
  • GO-2026-5102 CVE-2026-45021 GHSA-3vcp-chfh-f6r2
  • GO-2026-5272 CVE-2026-40938 GHSA-94jr-7pqp-xhcq
  • GO-2026-5486 CVE-2026-40924 GHSA-m2cx-gpqf-qf74
  • GO-2026-5542 CVE-2026-40090 GHSA-pj97-4p9w-gx3q
  • GO-2026-5630 CVE-2026-25542 GHSA-rmx9-2pp3-xhcr
  • GO-2026-5643 CVE-2026-40923 GHSA-rx35-6rhx-7858
  • GO-2026-5675 CVE-2026-41492 GHSA-vvf7-6rmr-m29q
  • GO-2026-5711 CVE-2026-40161 GHSA-wjxp-xrpv-xpff
  • GO-2026-5746 CVE-2026-41567 GHSA-x86f-5xw2-fm2r
  • GO-2026-5749 CVE-2026-41328 GHSA-x92x-px7w-4gx4
  • GO-2026-5837 CVE-2026-44840 GHSA-q2m9-6jp9-c6mc
  • GO-2026-5929 CVE-2026-44342 GHSA-26v7-h57m-gh9m
  • GO-2026-5930 CVE-2026-33655 GHSA-6qcr-qxgr-m7fv
  • GO-2026-5933 GHSA-3g4q-2f67-2gvh
  • GO-2026-5934 GHSA-59qp-cfj3-rp64
  • GO-2026-5935 GHSA-7856-g3gv-9wq8
  • GO-2026-5936 CVE-2026-53552 GHSA-26rh-24rg-j3vv
  • GO-2026-5937 CVE-2026-53508 GHSA-2jcc-mxv7-p3f9
  • GO-2026-5938 CVE-2026-53553 GHSA-4g5x-hcwm-82jw
  • GO-2026-5939 CVE-2026-10517 GHSA-698x-9w2p-7vvp
  • GO-2026-5940 CVE-2026-53572 GHSA-6w3m-4hhp-775q
  • GO-2026-5941 CVE-2026-53487 GHSA-gvhc-wv3v-7pf8
  • GO-2026-5942 CVE-2026-46600
  • GO-2026-5944 CVE-2026-50197 GHSA-659f-rgp5-w4wf
  • GO-2026-5945 CVE-2026-6815 GHSA-rmxx-v9rj-vpvg
  • GO-2026-5946 CVE-2026-52831 GHSA-v5px-423j-pf7p
  • GO-2026-5947 CVE-2026-53649 GHSA-xqhv-chqm-fhcc
  • GO-2026-5948 CVE-2026-50554 GHSA-588f-fvcv-xhvf
  • GO-2026-5949 CVE-2026-50553 GHSA-rqrh-8wpv-x7hh
  • GO-2026-5950 CVE-2026-53602 GHSA-339v-266x-79xr
  • GO-2026-5951 CVE-2026-10219 GHSA-6jm8-4fhr-5w64
  • GO-2026-5952 CVE-2026-49834 GHSA-9vcr-p3rj-q5q6
  • GO-2026-5953 CVE-2026-9094 GHSA-c9w5-qp6m-m395
  • GO-2026-5956 CVE-2026-55252 GHSA-h5g6-xmh4-hc37
  • GO-2026-5957 CVE-2026-54158 GHSA-5xfx-xj4h-5p7r
  • GO-2026-5958 CVE-2026-54068 GHSA-gcm7-57gf-953c
  • GO-2026-5959 CVE-2026-54072 GHSA-h29v-hj44-q8cv
  • GO-2026-5961 CVE-2026-54069 GHSA-hvr9-72v2-fff3
  • GO-2026-5962 CVE-2026-54088 GHSA-m93h-4hw7-5qcm
  • GO-2026-5963 CVE-2026-54067 GHSA-mvjr-vv3c-w4qv
  • GO-2026-5964 CVE-2026-54066 GHSA-p4m3-mgmm-c664
  • GO-2026-5965 CVE-2026-54070 GHSA-w7cg-whh7-xp28
  • GO-2026-5966 CVE-2026-54089 GHSA-xqp3-jq6g-x3qm
  • GO-2026-5967 CVE-2026-50551 GHSA-56mp-4f3v-fgj2
  • GO-2026-5968 CVE-2026-54174 GHSA-fpg8-7664-jc5q
  • GO-2026-5969 GHSA-g936-7jqj-mwv8
  • GO-2026-5970 CVE-2026-56852
  • GO-2026-5973 CVE-2026-54250 GHSA-jxr7-mqhw-9p98
  • GO-2026-5974 CVE-2026-44300 GHSA-wmj8-9953-vff5
  • GO-2026-5975 CVE-2026-50018 GHSA-42j2-w334-qxw7
  • GO-2026-5976 CVE-2026-50141 GHSA-g7mm-9vx7-jm7h
  • GO-2026-5977 CVE-2026-50013 GHSA-qrh4-p6v4-mrfg
  • GO-2026-5978 CVE-2026-50125 GHSA-qw5r-ppcg-f8rj
  • GO-2026-5979 CVE-2026-50006 GHSA-xrcf-6jh3-ggvx
  • GO-2026-5980 CVE-2026-50158 GHSA-2c7f-fxww-6w6c
  • GO-2026-5981 GHSA-mqxv-9rm6-w8qc
  • GO-2026-5982 GHSA-pqg7-v6wh-3pfp
  • GO-2026-5984 CVE-2026-53604 GHSA-2p2f-px33-4vv5
  • GO-2026-5985 GHSA-7rx3-5wx3-5v76
  • GO-2026-5986 CVE-2026-61699 GHSA-cm26-5974-52h8
  • GO-2026-5987 CVE-2026-55513 GHSA-g4x6-jcvr-9m3g
  • GO-2026-5988 CVE-2026-54628 GHSA-hwrq-8wxh-q4xv
  • GO-2026-5989 CVE-2026-55512 GHSA-m3cx-mwpg-32jg
  • GO-2026-5990 CVE-2026-54629 GHSA-mf78-3rpf-r784
  • GO-2026-5991 CVE-2026-53603 GHSA-q4vm-pq3q-8wgq
  • GO-2026-5992 CVE-2026-61549 GHSA-qf34-295c-26v8
  • GO-2026-5996 CVE-2026-54450 GHSA-pph6-vfjv-vpjw
  • GO-2026-5997 CVE-2026-54452 GHSA-xgch-x3mx-cm3c
  • GO-2026-5998 CVE-2026-54495 GHSA-398h-7f66-3h4p
  • GO-2026-5999 CVE-2026-10814 GHSA-jh6h-v6mp-h22v
  • GO-2026-6002 CVE-2026-58196 GHSA-pr64-jmmf-jp54
  • GO-2026-6003 CVE-2026-53714 GHSA-22xc-xg2r-9j7v
  • GO-2026-6004 CVE-2026-52833 GHSA-3v79-m2cg-89ww
  • GO-2026-6005 CVE-2026-53715 GHSA-8fv2-88gg-hm7q
  • GO-2026-6006 CVE-2026-53716 GHSA-cxpq-8v7q-cg56 *…
Record
openSUSE-SU-2026:21483-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/nezhahq/nezha
Go
 1.4.0 up to 1.14.15-0.20260517022419-d7526351cf97
1.14.15-0.20260517022419-d7526351cf97
govulncheck-vulndb
openSUSE:Leap 16.0
From an advisory covering 1734 CVEs
 before 0.0.20260723T184607-160000.1.1
0.0.20260723T184607-160000.1.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubHAERIN-L/POC_CVE-2026-467162026-05-30

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub

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

In short

CVE-2026-46716 is a critical vulnerability (CVSS 9.9) in Nezhahq Nezha, published May 23, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.43%, the 37th percentile. Fixed in github.com/nezhahq/nezha 1.14.15-0.20260517022419-d7526351cf97.

References

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