Security readout for executives and security teams
Plain-English summary
PlantUML 6.43 has a low-severity cross-site scripting issue in its Database Information Macro. An attacker with some access could craft content that affects a user who interacts with it, potentially causing limited page-content manipulation. The sources do not show confirmed active exploitation.
Executive priority
Treat as a low-priority hygiene item unless PlantUML rendering is exposed to untrusted users. Prioritize inventory and upgrade guidance over emergency response.
Technical view
CVE-2020-36523 is CWE-79 in PlantUML 6.43, affecting the Database Information Macro. CVSS 3.1 is 3.5 with network attack vector, low complexity, low privileges required, user interaction required, unchanged scope, no confidentiality or availability impact, and low integrity impact.
Likely exposure
Exposure is most likely where PlantUML 6.43 renders diagram input from users, customers, or other semi-trusted sources, especially through a web-accessible rendering service.
Exploitation context
The CVE record says exploitation can be remote and public exploit information has been disclosed. It is not listed as CISA KEV, and the supplied sources do not prove active exploitation in the wild.
Researcher notes
The bundle confirms affected version, component, CWE, CVSS, and public disclosure. It does not provide a named patch version, vendor advisory, proof of active exploitation, or detailed impact beyond low integrity impact.
Mitigation direction
- Inventory PlantUML deployments and identify any instance running version 6.43.
- Check PlantUML vendor guidance for a fixed or supported version before upgrading.
- Restrict PlantUML rendering endpoints to trusted users and internal networks where possible.
- Avoid rendering untrusted diagram input using Database Information Macro until assessed.
- Review browser-side protections around rendered PlantUML output, including CSP where applicable.
Validation and detection
- Confirm whether any production or internal service runs PlantUML 6.43.
- Identify web routes or APIs that accept user-supplied PlantUML source.
- Review whether Database Information Macro use is enabled or present in templates.
- Verify access controls around PlantUML rendering services.
- Check logs for unusual diagram submissions, without assuming exploitation occurred.
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.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-36523 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
- Low
- CVSS
- 3.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N2.11.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
3.5LowVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://seclists.org/fulldisclosure/2020/Oct/15CVE reference · x_refsource_MISC
- https://vuldb.com/?id.164509CVE 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.