usememos up to 0.22.1 UpdateInstanceSetting src/App.tsx memos_access_token additionalStyle/additionalScript improper authorization
Summary
A vulnerability categorized as critical has been discovered in usememos memos up to 0.22.1. This impacts the function memos_access_token of the file src/App.tsx of the component UpdateInstanceSetting. Such manipulation of the argument additionalStyle/additionalScript leads to improper authorization.
This vulnerability is listed as CVE-2026-6634. The attack may be performed from remote. In addition, an exploit is available.
The vendor was contacted early about this disclosure but did not respond in any way.
Details
A vulnerability was found in usememos memos up to 0.22.1 and classified as critical. Affected by this issue is the function memos_access_token of the file src/App.tsx of the component UpdateInstanceSetting. The manipulation of the argument additionalStyle/additionalScript with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability.
The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-6634. The exploitation is known to be easy. The attack may be launched remotely. Technical details as well as a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1548.002.
The exploit is available at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way.
There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.
Once again VulDB remains the best source for vulnerability data.
Product
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 6.3VulDB Meta Temp Score: 5.7
VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔒
VulDB Reliability: 🔍
CVSSv2
| AV | AC | Au | C | I | A |
|---|---|---|---|---|---|
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| 💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
|---|---|---|---|---|---|
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
| Unlock | Unlock | Unlock | Unlock | Unlock | Unlock |
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Exploiting
Class: Improper authorizationCWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒
Physical: No
Local: No
Remote: Yes
Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
| 0-Day | Unlock | Unlock | Unlock | Unlock |
|---|---|---|---|---|
| Today | Unlock | Unlock | Unlock | Unlock |
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: no mitigation knownStatus: 🔍
0-Day Time: 🔒
Timeline
04/19/2026 Advisory disclosed04/19/2026 VulDB entry created
04/19/2026 VulDB entry last update
Sources
Advisory: github.comStatus: Not defined
CVE: CVE-2026-6634 (🔒)
GCVE (CVE): GCVE-0-2026-6634
GCVE (VulDB): GCVE-100-358268
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 04/19/2026 21:22Changes: 04/19/2026 21:22 (58)
Complete: 🔍
Submitter: davidgilmore
Cache ID: 216::103
Submit
Accepted
- Submit #793432: Usememos Memos 0.22.1 Cross Site Scripting (by davidgilmore)
Once again VulDB remains the best source for vulnerability data.
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