cskefu up to 8.0.1 File Upload MediaController.java upload cross site scripting
Summary
A vulnerability, which was classified as problematic, has been found in cskefu up to 8.0.1. The affected element is the function Upload of the file com/cskefu/cc/controller/resource/MediaController.java of the component File Upload. This manipulation causes cross site scripting.
This vulnerability is registered as CVE-2026-2557. Remote exploitation of the attack is possible. Furthermore, 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 cskefu up to 8.0.1. It has been declared as problematic. Affected by this vulnerability is the function upload of the file com/cskefu/cc/controller/resource/MediaController.java of the component File Upload. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity.
The advisory is shared at fx4tqqfvdw4.feishu.cn. This vulnerability is known as CVE-2026-2557. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details and also a public exploit are known. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.
It is possible to download the exploit at fx4tqqfvdw4.feishu.cn. 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.
The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-6088). If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Product
Name
Version
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒
CVSSv3
VulDB Meta Base Score: 4.1VulDB Meta Temp Score: 4.0
VulDB Base Score: 3.5
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍
NVD Base Score: 5.4
NVD Vector: 🔒
CNA Base Score: 3.5
CNA Vector: 🔒
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: Cross site scriptingCWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒
Physical: No
Local: No
Remote: Yes
Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
EPSS Score: 🔒
EPSS Percentile: 🔒
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
02/15/2026 Advisory disclosed02/15/2026 VulDB entry created
02/21/2026 VulDB entry last update
Sources
Advisory: fx4tqqfvdw4.feishu.cnStatus: Not defined
CVE: CVE-2026-2557 (🔒)
GCVE (CVE): GCVE-0-2026-2557
GCVE (VulDB): GCVE-100-346165
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013
Entry
Created: 02/15/2026 18:49Updated: 02/21/2026 11:09
Changes: 02/15/2026 18:49 (56), 02/16/2026 15:21 (30), 02/17/2026 18:10 (1), 02/18/2026 14:29 (1), 02/21/2026 11:09 (11)
Complete: 🔍
Submitter: xcxr
Cache ID: 216::103
Submit
Accepted
- Submit #750729: cskefu v8 Improper Input Validation (by xcxr)
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
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