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CVE-2026-29186

Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs' security controls. This issue has been p
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2bee205abef38fee480ceec8bfd71fbee0a8a608d10e31f2ada8edcdbef00512
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
3

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 4 assertions

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ansible_portal:2"],"defaultStatus":"affected","packageName":"ansible-automation-platform/automation-portal","product":"Self-service automation portal 2","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/affected/2

{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:rhdh:1.9::el9"],"defaultStatus":"affected","packageName":"rhdh/rhdh-hub-rhel9","product":"Red Hat Developer Hub 1.9","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1777903262","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/affected/1

{"product":"backstage","vendor":"backstage","versions":[{"status":"affected","version":"< 1.14.3"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/cna/affected/0

{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:rhdh:1.8::el9"],"defaultStatus":"affected","packageName":"rhdh/rhdh-hub-rhel9","product":"Red Hat Developer Hub 1.8","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1776784286","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/affected/0
cvss · 2 assertions

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/cna/metrics/0/cvssV3_1

{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/metrics/1/cvssV3_1
cwe · 3 assertions

{"cweId":"CWE-74","description":"CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-791","description":"Incomplete Filtering of Special Elements","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/problemTypes/0/descriptions/0

{"cweId":"CWE-434","description":"CWE-434: Unrestricted Upload of File with Dangerous Type","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

4 source assertions
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:ansible_portal:2"],"defaultStatus":"affected","packageName":"ansible-automation-platform/automation-portal","product":"Self-service automation portal 2","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/affected/2
{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:rhdh:1.9::el9"],"defaultStatus":"affected","packageName":"rhdh/rhdh-hub-rhel9","product":"Red Hat Developer Hub 1.9","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1777903262","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/affected/1
{"product":"backstage","vendor":"backstage","versions":[{"status":"affected","version":"< 1.14.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/cna/affected/0
{"collectionURL":"https://catalog.redhat.com/software/containers/","cpes":["cpe:/a:redhat:rhdh:1.8::el9"],"defaultStatus":"affected","packageName":"rhdh/rhdh-hub-rhel9","product":"Red Hat Developer Hub 1.8","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"1776784286","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/cna/metrics/0/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/metrics/1/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-74","description":"CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-791","description":"Incomplete Filtering of Special Elements","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/problemTypes/0/descriptions/0
{"cweId":"CWE-434","description":"CWE-434: Unrestricted Upload of File with Dangerous Type","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/cna/problemTypes/0/descriptions/0

Source references

6 source assertions
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:13826"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/references/4
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:9742"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/references/3
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-29186"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/references/0
{"name":"RHBZ#2445480","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2445480"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/references/1
{"name":"https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/cna/references/0
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29186.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b6960c14465ee5e58764fd36f70c74f1c04971671bdf8d52c5e80d51877bb104 · sha256:2d3f418c6a33a2e6… · /containers/adp/1/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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