CVE-2021-32661
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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`.
- CVSS 3.1
- 7.3 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
- EPSS
- 1.21% probability · 68th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-77, CWE-434
- Affected
- linuxfoundation/\@backstage\/plugin-techdocs
- Source
- security-advisories@github.com
EPSS 1.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/backstage/backstage/commit/aad98c544e59369901fe9e0a85f6357644dceb5cPatch, Third Party Advisory
- https://github.com/backstage/backstage/releases/tag/release-2021-06-03Third Party Advisory
- https://github.com/backstage/backstage/security/advisories/GHSA-gg96-f8wr-p89fThird Party Advisory
- https://github.com/backstage/backstage/commit/aad98c544e59369901fe9e0a85f6357644dceb5cPatch, Third Party Advisory
- https://github.com/backstage/backstage/releases/tag/release-2021-06-03Third Party Advisory
- https://github.com/backstage/backstage/security/advisories/GHSA-gg96-f8wr-p89fThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.