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CVE-2026-35607

File Browser: Proxy auth auto-provisioned users inherit Execute permission and Commands

8.1 HighFix available

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, the fix in commit b6a4fb1 ("self-registered users don't get execute perms") stripped Execute permission and Commands from users created via the signup handler. The same fix was not applied to the proxy auth handler. Users auto-created on first successful proxy-auth login are granted execution capabilities from global defaults, even though the signup path was explicitly changed to prevent execution rights from being inherited by automatically provisioned accounts. This vulnerability is fixed in 2.63.1.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.40%Up 0.3 points since Apr 8, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.1

File Browser: Proxy auth auto-provisioned users inherit Execute permission and Commands

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, the fix in commit b6a4fb1 ("self-registered users don't get execute perms") stripped Execute permission and Commands from users created via the signup handler. The same fix was not applied to the proxy auth handler. Users auto-created on first successful proxy-auth login are granted execution capabilities from global defaults, even though the signup path was explicitly changed to prevent execution rights from being inherited by automatically provisioned accounts. This vulnerability is fixed in 2.63.1.

Record
CVE-2026-35607
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-269
Updated
2026-11-02
EUVDEUVD-2026-19782 8.1

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, the fix in commit b6a4fb1 ("self-registered users don't get execute perms") stripped Execute permission and Commands from users created via the signup handler. The same fix was not applied to the proxy auth handler. Users auto-created on first successful proxy-auth login are granted execution capabilities from global defaults, even though the signup path was explicitly changed to prevent execution rights from being inherited by automatically provisioned accounts. This vulnerability is fixed in 2.63.1.

Record
EUVD-2026-19782
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-7526-j432-6ppp 8.1

File Browser: Proxy auth auto-provisioned users inherit Execute permission and Commands

Summary

The fix in commit b6a4fb1 ("self-registered users don't get execute perms") stripped Execute permission and Commands from users created via the signup handler. The same fix was not applied to the proxy auth handler. Users auto-created on first successful proxy-auth login are granted execution capabilities from global defaults, even though the signup path was explicitly changed to prevent execution rights from being inherited by automatically provisioned accounts.

Confirmed on v2.62.2 (commit 860c19d).

Root Cause

auth/proxy.go createUser() applies defaults without restriction:

user := &users.User{
    Username:     username,
    Password:     hashedRandomPassword,
    LockPassword: true,
}
setting.Defaults.Apply(user)
// No restriction on Execute, Commands, or Admin

Compare with http/auth.go signup handler (lines 170-178):

d.settings.Defaults.Apply(user)
user.Perm.Admin = false
// Self-registered users should not inherit execution capabilities
// from default settings, regardless of what the administrator has
// configured as the default.
user.Perm.Execute = false
user.Commands = []string{}

The commit message for b6a4fb1 states: "Execution rights must be explicitly granted by an admin." Users auto-created via proxy auth are also automatically provisioned (created on first login without explicit admin action), and the admin has not explicitly granted them execution rights.

PoC

Tested on filebrowser v2.62.2, built from HEAD.

# Configure with proxy auth, default commands, and exec
filebrowser config set --auth.method=proxy --auth.header=X-Remote-User \
  --commands "git,ls,cat,id"

# Login as admin and verify defaults have execute=true, commands set
ADMIN_TOKEN=$(curl -s http://HOST/api/login -H "X-Remote-User: admin")

# Auto-create new user via proxy header
PROXY_TOKEN=$(curl -s http://HOST/api/login -H "X-Remote-User: newproxyuser")

# Check permissions
curl -s http://HOST/api/users -H "X-Auth: $ADMIN_TOKEN" | jq '.[] | select(.username=="newproxyuser") | {execute: .perm.execute, commands}'

Result:

{
  "execute": true,
  "commands": ["git", "ls", "cat", "id"]
}

The auto-created proxy user inherited Execute and the full Commands list. A user created via signup would have execute: false and commands: [].

Impact

In proxy-auth deployments where the admin has configured default commands, users auto-provisioned on first proxy login receive execution capabilities that were not explicitly granted. The project established a security invariant in commit b6a4fb1: automatically provisioned accounts must not inherit execution rights from defaults. The proxy auto-provisioning path violates that invariant.

This is an incomplete fix for GHSA-x8jc-jvqm-pm3f ("Signup Grants Execution Permissions When Default Permissions Includes Execution"), which addressed the signup handler but not the proxy auth handler.

Preconditions

  • Proxy auth enabled (--auth.method=proxy)
  • Exec not disabled
  • Default settings include non-empty Commands (admin-configured)

Suggested Fix

Apply the same restrictions as the signup handler:

setting.Defaults.Apply(user)
user.Perm.Admin = false
user.Perm.Execute = false
user.Commands = []string{}

Update: Fix submitted as PR #5890.

Record
GHSA-7526-j432-6ppp
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-269
Updated
2026-11-02
NVD 8.1

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, the fix in commit b6a4fb1 ("self-registered users don't get execute perms") stripped Execute permission and Commands from users created via the signup handler. The same fix was not applied to the proxy auth handler. Users auto-created on first successful proxy-auth login are granted execution capabilities from global defaults, even though the signup path was explicitly changed to prevent execution rights from being inherited by automatically provisioned accounts. This vulnerability is fixed in 2.63.1.

Record
CVE-2026-35607
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-269
Updated
2026-11-02
OSV 8.1

File Browser: Proxy auth auto-provisioned users inherit Execute permission and Commands

File Browser is a file managing interface for uploading, deleting, previewing, renaming, and editing files within a specified directory. Prior to 2.63.1, the fix in commit b6a4fb1 ("self-registered users don't get execute perms") stripped Execute permission and Commands from users created via the signup handler. The same fix was not applied to the proxy auth handler. Users auto-created on first successful proxy-auth login are granted execution capabilities from global defaults, even though the signup path was explicitly changed to prevent execution rights from being inherited by automatically provisioned accounts. This vulnerability is fixed in 2.63.1.

Record
CVE-2026-35607
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-269
Updated
2026-11-02
OSVGHSA-7526-j432-6ppp 8.1

File Browser: Proxy auth auto-provisioned users inherit Execute permission and Commands

Summary

The fix in commit b6a4fb1 ("self-registered users don't get execute perms") stripped Execute permission and Commands from users created via the signup handler. The same fix was not applied to the proxy auth handler. Users auto-created on first successful proxy-auth login are granted execution capabilities from global defaults, even though the signup path was explicitly changed to prevent execution rights from being inherited by automatically provisioned accounts.

Confirmed on v2.62.2 (commit 860c19d).

Root Cause

auth/proxy.go createUser() applies defaults without restriction:

user := &users.User{
    Username:     username,
    Password:     hashedRandomPassword,
    LockPassword: true,
}
setting.Defaults.Apply(user)
// No restriction on Execute, Commands, or Admin

Compare with http/auth.go signup handler (lines 170-178):

d.settings.Defaults.Apply(user)
user.Perm.Admin = false
// Self-registered users should not inherit execution capabilities
// from default settings, regardless of what the administrator has
// configured as the default.
user.Perm.Execute = false
user.Commands = []string{}

The commit message for b6a4fb1 states: "Execution rights must be explicitly granted by an admin." Users auto-created via proxy auth are also automatically provisioned (created on first login without explicit admin action), and the admin has not explicitly granted them execution rights.

PoC

Tested on filebrowser v2.62.2, built from HEAD.

# Configure with proxy auth, default commands, and exec
filebrowser config set --auth.method=proxy --auth.header=X-Remote-User \
  --commands "git,ls,cat,id"

# Login as admin and verify defaults have execute=true, commands set
ADMIN_TOKEN=$(curl -s http://HOST/api/login -H "X-Remote-User: admin")

# Auto-create new user via proxy header
PROXY_TOKEN=$(curl -s http://HOST/api/login -H "X-Remote-User: newproxyuser")

# Check permissions
curl -s http://HOST/api/users -H "X-Auth: $ADMIN_TOKEN" | jq '.[] | select(.username=="newproxyuser") | {execute: .perm.execute, commands}'

Result:

{
  "execute": true,
  "commands": ["git", "ls", "cat", "id"]
}

The auto-created proxy user inherited Execute and the full Commands list. A user created via signup would have execute: false and commands: [].

Impact

In proxy-auth deployments where the admin has configured default commands, users auto-provisioned on first proxy login receive execution capabilities that were not explicitly granted. The project established a security invariant in commit b6a4fb1: automatically provisioned accounts must not inherit execution rights from defaults. The proxy auto-provisioning path violates that invariant.

This is an incomplete fix for GHSA-x8jc-jvqm-pm3f ("Signup Grants Execution Permissions When Default Permissions Includes Execution"), which addressed the signup handler but not the proxy auth handler.

Preconditions

  • Proxy auth enabled (--auth.method=proxy)
  • Exec not disabled
  • Default settings include non-empty Commands (admin-configured)

Suggested Fix

Apply the same restrictions as the signup handler:

setting.Defaults.Apply(user)
user.Perm.Admin = false
user.Perm.Execute = false
user.Commands = []string{}

Update: Fix submitted as PR #5890.

Record
GHSA-7526-j432-6ppp
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-269
Updated
2026-11-02
OSVGO-2026-5205 No score

File Browser: Proxy auth auto-provisioned users inherit Execute permission and Commands in github.com/filebrowser/filebrowser

File Browser: Proxy auth auto-provisioned users inherit Execute permission and Commands in github.com/filebrowser/filebrowser

Record
GO-2026-5205
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/filebrowser/filebrowser/v2
Go
 before 2.63.1
2.63.1
github.com/filebrowser/filebrowser
Go
 All versions None known
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

History

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

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

In short

CVE-2026-35607 is a high vulnerability (CVSS 8.1) in Filebrowser, published April 7, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. Fixed in github.com/filebrowser/filebrowser/v2 2.63.1.

References

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