Arbitrary File Upload via System REST API in Multiple WSO2 Products Allows Remote Code Execution
The System REST API accepts user-supplied file uploads without enforcing sufficient validation on the file type or destination, allowing files to be written to arbitrary server-accessible locations. Exploitation requires authenticated administrative access with publisher privileges. Successful exploitation permits an authenticated publisher to upload files to server-accessible locations. Depending on the deployment environment and how uploaded files are handled, this could lead to the execution of uploaded content, potentially resulting in remote code execution.
- Published
- Aug 6, 2026
- Updated
- Sep 23, 2026
- EPSS
- 0.8% · 54th percentile
- CWE
- CWE-434
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Report tools
Action score
36
Monitor
Low priority for now.
- CVSS
- 36 / 40 · 9.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.8%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · WSO2
- 9.1
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (WSO2). Independent of NVD's CPE analysis and usually ahead of it.
WSO2 WSO2 API Control Plane
- 4.5.0 and later · before 4.5.0.53affected
- 4.6.0 and later · before 4.6.0.17affected
WSO2 WSO2 API Manager
- 4.4.0 and later · before 4.4.0.67affected
- 4.5.0 and later · before 4.5.0.52affected
- 4.6.0 and later · before 4.6.0.16affected
WSO2 WSO2 API Manager Publisher REST API V4
- 9.30.67 and later · before 9.30.67.156affected
- 9.31.86 and later · before 9.31.86.141affected
- 9.32.147 and later · before 9.32.147.44affected
- 9.33.104 and laternot affected
WSO2 WSO2 Carbon API Management API
- 9.30.67 and later · before 9.30.67.156affected
- 9.33.104 and laternot affected
WSO2 WSO2 Carbon API Management Implementation
- 9.30.67 and later · before 9.30.67.156affected
- 9.31.86 and later · before 9.31.86.141affected
- 9.32.147 and later · before 9.32.147.44affected
- 9.33.104 and laternot affected
WSO2 WSO2 Traffic Manager
- 4.5.0 and later · before 4.5.0.51affected
- 4.6.0 and later · before 4.6.0.16affected
WSO2 WSO2 Universal Gateway
- 4.5.0 and later · before 4.5.0.52affected
- 4.6.0 and later · before 4.6.0.16affected
Same product
wso2: all recordsOther highest-scoring records for the same primary product.
- CVE-2025-14561Access Control Bypass via Publisher REST APIs in Multiple WSO2 Products Allows Cross-Tenant Operations36Monitor
- CVE-2026-3415XML External Entity (XXE) Injection via Schema Validation in Multiple WSO2 Products Allows File Reading and Denial of Service34Monitor
- CVE-2025-5802Username Enumeration via Self Registration Flow in Multiple WSO2 Products Allows User Account Discovery21Monitor
- CVE-2025-6508User Interface Misrepresentation via Swagger UI Try-out Console in WSO2 API Manager Allows Sensitive Information Exposure or Unintended Requests17Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Thilan Dissanayakafinder
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- Administrator privileges are required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-434 · Unrestricted Upload of File with Dangerous TypeCVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.