RCE in Backstage
CVE-2021-32661
Backstage is an open platform for building developer portals. In versions of Backstage's Techdocs Plugin (`@backstage/plugin-techdocs`) prior to 0.9.5, a malicious internal actor can potentially upload documentation content with malicious scripts by embedding the script within an `object` element. This may give access to sensitive data when other users visit that same documentation page. The ability to upload malicious content may be limited by internal code review processes, unless the chosen TechDocs deployment method is to use an object store and the actor has access to upload files directly to that store. The vulnerability is patched in the `0.9.5` release of `@backstage/plugin-techdocs`.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.012 (67.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Backstage — versions < 0.9.5
- Linuxfoundation \@Backstage\/plugin-Techdocs
Weakness classification (CWE)
References
- github.com/backstage/backstage/commit/aad98c544e59369901fe9e0a85f6357644dceb5c (Patch, Third Party Advisory)
- github.com/backstage/backstage/releases/tag/release-2021-06-03 (Third Party Advisory)
- github.com/backstage/backstage/security/advisories/GHSA-gg96-f8wr-p89f (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-32661?
- CVE-2021-32661 is a medium-severity vulnerability in Backstage, classified under Command Injection. CVSS score: 6.8/10. Published 2021-06-03.
- How severe is CVE-2021-32661?
- Medium severity. CVSS v3 base score is 6.8 out of 10.