CVE-2026-9581
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 JeecgBoot up to 3.9.1. The impacted element is an unknown function of the file /sys/comment/add. Such manipulation leads to improper access controls. The attack can be executed remotely. The exploit is publicly available and might be used. Upgrading to version 3.9.2 is sufficient to resolve this issue. Upgrading the affected component is recommended.
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 · high confidenceJeecgBoot up to version 3.9.1 contains an improper access control vulnerability in the /sys/comment/add endpoint. This allows remote attackers to add comments without proper authorization, likely bypassing authentication or role-based access controls intended to restrict this function.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS 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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
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.
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Identify JeecgBoot installationLocate JeecgBoot application files or check running services. Common paths include /opt/jeecgboot, /var/www/jeecgboot, or check for Java/Spring Boot processes with jeecg in the name.Affected if JeecgBoot application is present in the environment
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Determine installed JeecgBoot versionCheck version files (pom.xml, package.json, application.yml/properties) or query the API /api/version endpoint if available. Also check WAR/JAR file names or Docker image tags.Affected if Version is 3.9.1 or earlier
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Verify the vulnerable endpoint is exposedCheck the application's API routing configuration or Spring Security configuration files for the /sys/comment/add endpoint mapping. In a running environment, test if the endpoint responds.Affected if The /sys/comment/add endpoint is accessible without authentication or with weak authentication
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Test access control on the comment APISend a POST request to /sys/comment/add (or /api/sys/comment/add) without valid authentication credentials or with an unauthenticated session. Observe if the request succeeds.Affected if The API accepts the request and returns success without proper authentication
Environment is affected if JeecgBoot version 3.9.1 or earlier is running AND the /sys/comment/add endpoint accepts requests without proper authentication verification.
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.
dbcve · scopedUpgrade JeecgBoot to version 3.9.2 as the vendor has addressed the access control flaw in this release.
JeecgBoot 3.9.2
- Ensure you have a complete backup of your JeecgBoot application and database before upgrading
- Download JeecgBoot version 3.9.2 from the official repository or release channel
- Deploy version 3.9.2 to your production environment, following standard deployment procedures for your infrastructure
- Verify the /sys/comment/add endpoint now enforces proper access controls
- Test that legitimate comment functionality still works as expected after the upgrade
- Monitor logs for any unusual access attempts to the affected endpoint
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing6.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-9581 — 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-2026-9581 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
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- 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
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