CVE-2021-43783: high-severity vulnerability in backstage
Path Traversal in @backstage/plugin-scaffolder-backend
Published · Updated
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.5epss 1.2%
exploitation probability
1.2%top 32% of all CVEs
observed exploitation
nono source reports it
@backstage/plugin-scaffolder-backend is the backend for the default Backstage software templates. In affected versions a malicious actor with write access to a registered scaffolder template is able to manipulate the template in a way that writes files to arbitrary paths on the scaffolder-backend host instance. This vulnerability can in some situation also be exploited through user input when executing a template, meaning you do not need write access to the templates. This method will not allow the attacker to control the contents of the injected file however, unless the template is also crafted in a specific way that gives control of the file contents. This vulnerability is fixed in version `0.15.14` of the `@backstage/plugin-scaffolder-backend`. This attack is mitigated by restricting access and requiring reviews when registering or modifying scaffolder templates.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:L
Affected products
backstage · backstageRelated CVEs — backstage
In the same product, most dangerous first.
CVE-2023-35926HIGHInsecure sandbox in Backstage Scaffolder pluginEPSS 1.9%CVE-2021-41151MEDIUMPath Traversal in @backstage/plugin-scaffolder-backendEPSS 1.3%CVE-2021-32662MEDIUMTechDocs mkdocs.yml path traversalEPSS 1.3%CVE-2021-32660MEDIUMTechDocs content sanitization bypassEPSS 1.3%CVE-2021-32661MEDIUMTechDocs object element script injectionEPSS 1.2%CVE-2026-88064HIGHBackstage: Improper input validation in TechDocs MkDocs configurationEPSS 1.2%