# Backstage Plugin-Auth-Backend vulnerabilities

Source: https://junglewise.ai/threats/technologies/plugin-auth-backend  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 12 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/plugin-auth-backend.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 4 vulnerabilities in Backstage Plugin-Auth-Backend: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-73563, was published on 13 August 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 4 (0 critical, 0 exploited in the wild)

## About Backstage Plugin-Auth-Backend

A software library for implementing authentication backends within the Backstage developer portal framework.

## Latest Backstage Plugin-Auth-Backend vulnerabilities

- [CVE-2026-73563: Backstage plugin-auth-backend OAuth redirect_uri allowlist bypass](https://junglewise.ai/threats/cve-2026-73563-backstage-plugin-auth-backend-oauth-redirect-uri-allowlist-bypass) (medium, CVSS 4.7, published 13 Aug 2026)
- [CVE-2026-32236: Backstage auth-backend SSRF in CIMD metadata fetch](https://junglewise.ai/threats/cve-2026-32236-backstage-auth-backend-ssrf-in-cimd-metadata-fetch) (medium, CVSS 4, published 12 Mar 2026)
- [CVE-2026-32235: Backstage Auth Backend OAuth redirect URI allowlist bypass](https://junglewise.ai/threats/cve-2026-32235-backstage-auth-backend-oauth-redirect-uri-allowlist-bypass) (low, CVSS 3.1, published 12 Mar 2026)
- [CVE-2021-43776: Backstage plugin-auth-backend reflected cross-site scripting](https://junglewise.ai/threats/cve-2021-43776-backstage-plugin-auth-backend-reflected-cross-site-scripting) (low, CVSS 3.1, published 1 Dec 2021)

## Most severe Backstage Plugin-Auth-Backend vulnerabilities

- [CVE-2026-73563: Backstage plugin-auth-backend OAuth redirect_uri allowlist bypass](https://junglewise.ai/threats/cve-2026-73563-backstage-plugin-auth-backend-oauth-redirect-uri-allowlist-bypass) (medium, CVSS 4.7, published 13 Aug 2026)
- [CVE-2026-32236: Backstage auth-backend SSRF in CIMD metadata fetch](https://junglewise.ai/threats/cve-2026-32236-backstage-auth-backend-ssrf-in-cimd-metadata-fetch) (medium, CVSS 4, published 12 Mar 2026)
- [CVE-2021-43776: Backstage plugin-auth-backend reflected cross-site scripting](https://junglewise.ai/threats/cve-2021-43776-backstage-plugin-auth-backend-reflected-cross-site-scripting) (low, CVSS 3.1, published 1 Dec 2021)
- [CVE-2026-32235: Backstage Auth Backend OAuth redirect URI allowlist bypass](https://junglewise.ai/threats/cve-2026-32235-backstage-auth-backend-oauth-redirect-uri-allowlist-bypass) (low, CVSS 3.1, published 12 Mar 2026)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Other Backstage technologies

- [Backstage Plugin-Scaffolder-Backend](https://junglewise.ai/threats/technologies/plugin-scaffolder-backend): 10 vulnerabilities
- [Backstage Plugin-Techdocs-Node](https://junglewise.ai/threats/technologies/plugin-techdocs-node): 10 vulnerabilities
- [Backstage Backend-Defaults](https://junglewise.ai/threats/technologies/backend-defaults): 5 vulnerabilities
- [Backstage Catalog Backend Plugin](https://junglewise.ai/threats/technologies/plugin-catalog-backend): 4 vulnerabilities
- [Backstage Plugin-Techdocs-Backend](https://junglewise.ai/threats/technologies/plugin-techdocs-backend): 4 vulnerabilities
- [Backstage Scaffolder Backend Plugin](https://junglewise.ai/threats/technologies/scaffolder-backend-plugin): 3 vulnerabilities
- [Backstage TechDocs](https://junglewise.ai/threats/technologies/techdocs): 3 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Backstage Plugin-Auth-Backend vulnerabilities", https://junglewise.ai/threats/technologies/plugin-auth-backend, 12 November 2026.