CVE-2021-32662 json
TechDocs mkdocs.yml path traversal
published 2021-06-03 5 y ago modified 2026-07-08 4 mo ago also GHSA-pgf8-28gg-vpr6 , EUVD-2021-1371
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 70%
- public exploits
- 0
- none known
Summary
Backstage is an open platform for building developer portals, and techdocs-common contains common functionalities for Backstage's TechDocs. In `@backstage/techdocs-common` versions prior to 0.6.3, a malicious actor could read sensitive files from the environment where TechDocs documentation is built and published by setting a particular path for `docs_dir` in `mkdocs.yml`. These files would then be available over the TechDocs backend API. This vulnerability is mitigated by the fact that an attacker would need access to modify the `mkdocs.yml` in the documentation source code, and would also need access to the TechDocs backend API. The vulnerability is patched in the `0.6.3` release of `@backstage/techdocs-common`.
Patch / fix
- npm @backstage/techdocs-common 0.6.3
- linuxfoundation backstage 0.6.3
Exploit prediction
1.28% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:P/I:N/A:N |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @backstage/techdocs-common | <0.6.3 |
0.6.3 |
Affected products
- backstage backstage
Classification
- Weakness
-
- CWE-22 Improper Limitation of a Pathname to a Restricted Directory
References
-
github.com
/backstage/backstage/commit/8cefadca04cbf01d0394b0cb1983247e5f1d6208
web, patch, third-party-advisory
-
github.com
/backstage/backstage/security/advisories/GHSA-pgf8-28gg-vpr6
web, third-party-advisory
-
github.com
/backstage/backstage/releases/tag/release-2021-05-27
web, release-notes, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-32662
advisory
Sources
- CVE List CVE-2021-32662
- GitHub Advisory GHSA-pgf8-28gg-vpr6
- NVD CVE-2021-32662
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.