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CVE-2026-55778

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.9.1-alpha.11 and 8.6.81, the default fileUpload.fileExtensions blocklist could be bypassed by uploading a file with a non-standard or compound extension and dangerous content type, allowing storage adapters such as S3 and GCS to serve attacker-supplied active content and enable stored cross-site scripting. This issue is fixed in versions 9.9.1-alpha.11 and 8.6.81.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:83645949bbcd742e55135902e84eb39ffcd609110c5b6e08352c303ae8872542
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"parse-server","vendor":"parse-community","versions":[{"status":"affected","version":">= 9.0.0-alpha.1, < 9.9.1-alpha.11"},{"status":"affected","version":"< 8.6.81"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:86a54dbaf2813fc157c9ceacba38476b81a2acbadc56f2d747b1e414a2cd0bde · sha256:a8e08841f70629dc… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.1,"baseSeverity":"LOW","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:86a54dbaf2813fc157c9ceacba38476b81a2acbadc56f2d747b1e414a2cd0bde · sha256:a8e08841f70629dc… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"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:v2:86a54dbaf2813fc157c9ceacba38476b81a2acbadc56f2d747b1e414a2cd0bde · sha256:a8e08841f70629dc… · /containers/cna/problemTypes/0/descriptions/0

Source references

7 source assertions
{"name":"https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a","tags":["x_refsource_MISC"],"url":"https://github.com/parse-community/parse-server/commit/97c6a78d19f976ec756c1295f08a8fccab90799a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86a54dbaf2813fc157c9ceacba38476b81a2acbadc56f2d747b1e414a2cd0bde · sha256:a8e08841f70629dc… · /containers/cna/references/3
{"name":"https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50","tags":["x_refsource_MISC"],"url":"https://github.com/parse-community/parse-server/commit/be12a60d65b6e140481882037fb896b1f951df50"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86a54dbaf2813fc157c9ceacba38476b81a2acbadc56f2d747b1e414a2cd0bde · sha256:a8e08841f70629dc… · /containers/cna/references/4
{"name":"https://github.com/parse-community/parse-server/pull/10505","tags":["x_refsource_MISC"],"url":"https://github.com/parse-community/parse-server/pull/10505"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86a54dbaf2813fc157c9ceacba38476b81a2acbadc56f2d747b1e414a2cd0bde · sha256:a8e08841f70629dc… · /containers/cna/references/1
{"name":"https://github.com/parse-community/parse-server/pull/10506","tags":["x_refsource_MISC"],"url":"https://github.com/parse-community/parse-server/pull/10506"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86a54dbaf2813fc157c9ceacba38476b81a2acbadc56f2d747b1e414a2cd0bde · sha256:a8e08841f70629dc… · /containers/cna/references/2
{"name":"https://github.com/parse-community/parse-server/releases/tag/8.6.81","tags":["x_refsource_MISC"],"url":"https://github.com/parse-community/parse-server/releases/tag/8.6.81"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86a54dbaf2813fc157c9ceacba38476b81a2acbadc56f2d747b1e414a2cd0bde · sha256:a8e08841f70629dc… · /containers/cna/references/5
{"name":"https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11","tags":["x_refsource_MISC"],"url":"https://github.com/parse-community/parse-server/releases/tag/9.9.1-alpha.11"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86a54dbaf2813fc157c9ceacba38476b81a2acbadc56f2d747b1e414a2cd0bde · sha256:a8e08841f70629dc… · /containers/cna/references/6
{"name":"https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93","tags":["x_refsource_CONFIRM"],"url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-v8x7-r927-cc93"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86a54dbaf2813fc157c9ceacba38476b81a2acbadc56f2d747b1e414a2cd0bde · sha256:a8e08841f70629dc… · /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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