CVE-2026-3813
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability was identified in opencc JFlow up to 5badc00db382d7cb82dad231e6a866b18e0addfe. Affected by this vulnerability is the function Calculate of the file src/main/java/bp/wf/httphandler/WF_CCForm.java. Such manipulation leads to injection. The attack may be performed from remote. The exploit is publicly available and might be used. This product utilizes a rolling release system for continuous delivery, and as such, version information for affected or updated releases is not disclosed. The project was informed of the problem early through an issue report but has not responded yet.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA code injection vulnerability exists in the Calculate function of WF_CCForm.java in opencc JFlow. The vulnerability allows remote attackers to inject malicious code through unsanitized input processed by this function, which operates in the web request handling layer.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versionsCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
-
Identify Opencc JFlow installationLocate the Opencc JFlow application in your environment by searching for JFlow-related files, directories, or running services. Check web server document roots and application deployment directories for 'jflow' or 'WF_CCForm' references.Affected if Opencc JFlow is present in the environment
-
Locate vulnerable WF_CCForm componentSearch for the file WF_CCForm.java in the application source code or deployment. This file contains the Calculate function that processes web requests.Affected if WF_CCForm.java file exists in the application
-
Verify Calculate function exposureExamine web routing or servlet configuration files (such as web.xml, spring-mvc config, or route definitions) to determine if the Calculate function in WF_CCForm is mapped to a URL endpoint accessible via HTTP requests.Affected if The Calculate function is mapped to a publicly accessible web URL endpoint
-
Test Calculate function for input handlingSend a test HTTP request to the Calculate function endpoint with arbitrary input data and observe whether the application processes or reflects the input without sanitization or validation.Affected if The Calculate function accepts and processes user-supplied input without visible sanitization
-
Review input validation on Calculate endpointInspect the Calculate function source code or runtime behavior to determine if input validation, sanitization, or parameterized queries are implemented for data received by this function.Affected if No input validation or sanitization is implemented for the Calculate function
Your environment is affected if Opencc JFlow is installed and the WF_CCForm Calculate function is accessible via web requests without proper input validation.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUntil an official patch is released, consider disabling or restricting access to the affected WF_CCForm handler, and implement strict input validation and sanitization on all user-supplied data entering the Calculate function.
- Consultation3.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,088.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-3813 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-3813 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data