7.7

CVE-2026-106498: backstage Incorrect Authorization

CVSS: 7.7v3.1HighAnalyzed
AliasesGHSA-qgvj-qcf8-xq73
Published 06-10-2026Last modified 09-10-2026
Open JSON

Vulnerability summary

CVE-2026-106498 is a high (CVSS 7.7) Incorrect Authorization vulnerability in backstage. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 22% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.7/10
010
High · v3.1 (CVE.org)
EPSS score
0.31%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 06-10-2026
    PublishedVulnerability first disclosed.
  2. 09-10-2026
    Last modifiedVulnerability information updated.

Description

Backstage is an open framework for building developer portals. Prior to 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1, the @backstage/plugin-catalog-backend package is affected by improper url validation in catalog entity placeholder resolution. An authenticated Backstage user could craft a catalog entity with placeholder directives that reference resources outside the entity's source repository. Under certain configurations, this could allow access to data not intended to be available to the user. This issue is fixed in versions 3.5.1, 3.6.2, 3.7.2, 3.8.2 and 3.9.1.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

07-10-202619-10-2026
EPSS score
0.31%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

@backstage2 products
  • plugin-catalog-backend< 3.5.1 | ≥ 3.6.0, < 3.6.2 | ≥ 3.7.0, < 3.7.2 | ≥ 3.8.0, < 3.8.2 | ≥ 3.9.0, < 3.9.1
  • plugin-catalog-backend< 3.9.1
Linuxfoundation2 products
  • backstage< 1.49.6 | ≥ 1.50.0, < 1.50.5 | ≥ 1.51.0, < 1.51.3 | ≥ 1.52.0, < 1.53.2 | ≥ 1.54.0, < 1.54.6
  • backstage_plugin-catalog-backend< 3.5.1 | ≥ 3.6.0, < 3.6.2 | ≥ 3.7.0, < 3.7.2 | ≥ 3.8.0, < 3.8.2 | ≥ 3.9.0, < 3.9.1
Backstage1 product
  • backstage< 1.49.6 | ≥ 1.50.0-next.0, < 1.50.5 | ≥ 1.51.0-next.0, < 1.51.3 | ≥ 1.52.0-next.0, < 1.53.2 | ≥ 1.54.0-next.0, < 1.54.6

3 vendors · 5 products

References

13 links
Show all 13 references