CVE-2021-20687
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 · uneditedCross-site request forgery (CSRF) vulnerability in Kagemai 0.8.8 allows remote attackers to hijack the authentication of administrators via unspecified vectors.
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 confidenceKagemai 0.8.8 contains a CSRF vulnerability allowing remote attackers to trick authenticated administrators into performing unintended actions, potentially hijacking their session. The attack vector involves unspecified vectors that induce an authenticated admin to send malicious requests to the application.
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 data= 0.8.8CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.
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Confirm Kagemai versionLocate and inspect the version file, about page, or HTTP response headers that display the Kagemai application version. Common locations include a version.txt file, a version info in the main index page, or the Server header in HTTP responses.Affected if The installed version is exactly 0.8.8
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Verify admin authentication is enabledCheck the Kagemai configuration files or setup to determine whether administrator accounts have been created and admin authentication is required for management functions.Affected if Admin authentication is configured and active in the environment
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Inspect forms for anti-CSRF tokensExamine the HTML source of state-changing forms (such as ticket creation, user management, or configuration updates) to determine if hidden anti-CSRF token fields are present and submitted with requests.Affected if No anti-CSRF token fields are found in admin-facing forms
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Check AJAX endpoints for token validationInspect client-side JavaScript or capture network requests to determine if AJAX endpoints that modify state include any token parameters or validate the request origin.Affected if AJAX state-changing endpoints lack token-based CSRF protection
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Review session cookie configurationInspect the session cookie configuration or headers to determine if the SameSite attribute is set and properly configured.Affected if Session cookies lack SameSite attribute or are set to None without secure flags
If Kagemai version 0.8.8 is running with admin authentication enabled and state-changing operations lack anti-CSRF tokens, the environment is vulnerable to CVE-2021-20687.
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 · scopedImplement anti-CSRF tokens on all state-changing operations (forms and AJAX endpoints) and validate these tokens server-side. Additionally, configure SameSite attribute on session cookies and validate Origin/Referer headers as defense-in-depth.
- Kagemai 0.8.8 appears to be the final release of this project with no subsequent versions available.
- Verify the current status of the Kagemai project at the official distribution source (kagemai.sourceforge.net) to confirm whether any unpublished patches exist.
- If no official fix is available, consider these mitigation strategies: 1) Ensure administrators access the application only from trusted networks; 2) Implement anti-CSRF tokens in the application code if you maintain a fork; 3) Deploy a web application firewall (WAF) to filter CSRF attack vectors; 4) Consider migrating to an actively maintained alternative ticket management system.
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-20687 — 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-2021-20687 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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