CVE-2026-106494: Backstage is an open framework for building developer portals

Q: How do I fix CVE-2026-106494?

backstage\/backend defaults: upgrade to 0.17.8; backstage: upgrade to 1.54.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-106494 being exploited?

CVE-2026-106494 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-106494 affect?

CVE-2026-106494 affects backstage\/backend defaults, backstage. Severity is medium (CVSS 4.4). Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper input validation in cloud storage url readers. An attacker with write access to a cloud storage

Q: How urgent is CVE-2026-106494?

Priority 26/100. On your watchlist

Routine

MEDIUM 4.4WATCHLISTUPGRADEUPGRADE

CVE-2026-106494 is a medium-severity flaw (CVSS 4.4) affecting backstage\/backend defaults, backstage. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper input validation in cloud storage url readers. An attacker with write access to a cloud storage bucket used by Backstage could craft object names that could collide with protected files in the output directory. In certain deployment configurations, this could lead to content injection. This issue is fixed

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.4 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-22, CWE-73
Published	2026-10-06
Last modified	2026-10-22

Publisher (CNA): GitHub, Inc. · Vendor: linuxfoundation

Last updated 2026-10-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-06 21:17 UTCPublished CVE record published
2026-10-22 13:03 UTCUpdated Record last modified

linuxfoundation backstage\/backend defaults UPGRADE

Affected: < 0.17.8

Fixed in: 0.17.8

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls backstagebackend-defaults

2. UPGRADE to 0.17.8

npm install backstagebackend-defaults@">=0.17.8"

linuxfoundation backstage UPGRADE

Affected: < 1.54.6

Fixed in: 1.54.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy backstage || rpm -q backstage || backstage --version

2. UPGRADE to 1.54.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade backstage

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade backstage

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-106494?

backstage\/backend defaults: upgrade to 0.17.8; backstage: upgrade to 1.54.6. Exact commands for each OS are on this page.

Is CVE-2026-106494 being exploited?

CVE-2026-106494 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-106494 affect?

CVE-2026-106494 affects backstage\/backend defaults, backstage. Severity is medium (CVSS 4.4). Backstage is an open framework for building developer portals. Prior to 0.17.8, the @backstage/backend-defaults package is affected by improper input validation in cloud storage url readers. An attacker with write access to a cloud storage

How urgent is CVE-2026-106494?

Priority 26/100. On your watchlist

References

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