Security readout for executives and security teams
Plain-English summary
CVE-2021-20769 is an authenticated cross-site scripting issue in the Bulletin feature of Cybozu Garoon versions 4.6.0 through 5.0.2. An attacker with valid access could inject script content, potentially affecting other users who view the crafted bulletin content.
Executive priority
Treat this as a moderate-risk collaboration-platform issue. It is not documented as actively exploited here, but affected Garoon versions should be updated or mitigated because authenticated users may be able to impact other users through stored web content.
Technical view
The public record describes remote authenticated script injection through unspecified vectors in Cybozu Garoon Bulletin. No CVSS score, CWE, detailed vector, or concrete remediation text is included in the supplied bundle, so validation should focus on version exposure and vendor guidance.
Likely exposure
Organizations running Cybozu Garoon 4.6.0 to 5.0.2 are the known exposed group. Risk is higher where many internal or partner users can post or view Bulletin content, especially in shared business portals.
Exploitation context
The supplied sources do not show CISA KEV listing or active exploitation. The attacker is described as remote but authenticated, which limits reach compared with unauthenticated web vulnerabilities but still matters in shared collaboration environments.
Researcher notes
Key gaps remain: the vector is unspecified, CVSS is absent, and the supplied bundle does not include patch details. Avoid assuming unauthenticated reach or public exploitation. Focus analysis on affected Garoon versions, Bulletin permissions, and vendor advisory confirmation.
Mitigation direction
- Identify Garoon deployments and confirm exact versions.
- Review Cybozu and JVN advisories for supported fixed versions or mitigations.
- Prioritize updates for systems running 4.6.0 through 5.0.2.
- Restrict Bulletin posting rights where business impact permits.
- Monitor vendor guidance for any additional remediation details.
Validation and detection
- Inventory all Cybozu Garoon instances and their versions.
- Confirm whether the Bulletin feature is enabled and broadly accessible.
- Review Bulletin content for unexpected script-like entries.
- Check access logs for unusual authenticated Bulletin activity.
- Verify remediation status against Cybozu advisory guidance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-20769 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://cs.cybozu.co.jp/2021/007206.htmlCVE reference · x_refsource_MISC
- https://jvn.jp/en/jp/JVN54794245/index.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.