CVE-2026-29184 @backstage/plugin-scaffolder-backend: Potential Session Token Exfiltration via Log Redaction Bypass
A malicious scaffolder template can bypass log redaction to exfiltrate secrets via task event logs in Backstage developer portals.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-29184?
CVE-2026-29184 is a low-severity vulnerability in backstage, published on 7 Mar 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
Backstage is an open framework for building developer portals. Prior to version 3.1.4, a malicious scaffolder template can bypass the log redaction mechanism to exfiltrate secrets provided run through task event logs. This issue has been patched in version 3.1.4.
Weakness: CWE-532
Which versions are affected by CVE-2026-29184?
2 open source packages ship an affected version, including @backstage/plugin-scaffolder-backend. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@backstage/plugin-scaffolder-backend npm | All versions | 3.1.4 |
@backstage/plugin-scaffolder-backend npm | All versions | 3.1.4 |
Products include Linuxfoundation Backstage\/Plugin-Scaffolder-Backend.
How do I fix CVE-2026-29184?
Upgrade @backstage/plugin-scaffolder-backend to 3.1.4 or later.
Is CVE-2026-29184 being exploited?
There is no known exploitation of CVE-2026-29184 in the wild and no public exploit code.
Other vulnerabilities in backstage
Sources
Also known as GHSA-8qp7-fhr9-fw53.