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CVE-2026-55660

Tina is a headless content management system. In versions prior to @tinacms/app 2.5.6 and tinacms 3.9.3, cross-origin postMessage handlers and a rich-text URL-sanitization bypass enable stored XSS and session takeover. The library registers window message listeners — the useTina overlay handler, the OAuth authentication popup handler, and the admin↔preview iframe GraphQL reducer — that act on event.data without verifying event.origin or event.source and post messages using non-specific target or
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:6607432485a195cad26f2635fdcd3eca9bd909b23722d7cd18f7f02441581247
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"@tinacms/app","vendor":"tinacms","versions":[{"status":"affected","version":"< 2.5.6"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/affected/1

{"product":"tinacms","vendor":"tinacms","versions":[{"status":"affected","version":"< 3.9.3"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/affected/0
cwe · 4 assertions

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-940","description":"CWE-940: Improper Verification of Source of a Communication Channel","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/problemTypes/3/descriptions/0

{"cweId":"CWE-601","description":"CWE-601: URL Redirection to Untrusted Site ('Open Redirect')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/problemTypes/2/descriptions/0

{"cweId":"CWE-346","description":"CWE-346: Origin Validation Error","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

2 source assertions
{"product":"@tinacms/app","vendor":"tinacms","versions":[{"status":"affected","version":"< 2.5.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/affected/1
{"product":"tinacms","vendor":"tinacms","versions":[{"status":"affected","version":"< 3.9.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7.6,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

4 source assertions
{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-940","description":"CWE-940: Improper Verification of Source of a Communication Channel","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/problemTypes/3/descriptions/0
{"cweId":"CWE-601","description":"CWE-601: URL Redirection to Untrusted Site ('Open Redirect')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/problemTypes/2/descriptions/0
{"cweId":"CWE-346","description":"CWE-346: Origin Validation Error","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/tinacms/tinacms/pull/7056","tags":["x_refsource_MISC"],"url":"https://github.com/tinacms/tinacms/pull/7056"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/references/1
{"name":"https://github.com/tinacms/tinacms/security/advisories/GHSA-g5qx-h5f3-mp2f","tags":["x_refsource_CONFIRM"],"url":"https://github.com/tinacms/tinacms/security/advisories/GHSA-g5qx-h5f3-mp2f"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7ff633a442698591d17a47d5ea394f12bb49486cfa2b4893f92d6ed5565aa708 · sha256:d500438973efae7b… · /containers/cna/references/0

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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