CVE-2026-55778

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Source
https://cve.org/CVERecord?id=CVE-2026-55778
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55778.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-55778
Aliases
Published
2026-07-08T20:50:52Z
Modified
2026-10-21T02:58:39Z
Severity
  • 2.1 (Low) CVSS_V4 - 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 CVSS Calculator
Summary
Parse Server: Stored XSS via non-standard file extension bypassing file upload extension blocklist
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-434"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55778.json"
}
References

Affected packages

Git / github.com/parse-community/parse-server

Affected ranges

Type
GIT
Repo
https://github.com/parse-community/parse-server
Events
Introduced
74f85e9b1682648a7bde106ab401adb4183132c6
Fixed
ccf85f95b382a1efcea360f3ef3ba7f1bb3abde3
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
bccd92c768e7e793239f179718b804e7ce1ae125
Fixed
97c6a78d19f976ec756c1295f08a8fccab90799a
Fixed
be12a60d65b6e140481882037fb896b1f951df50
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "9.0.0-alpha.1"
                },
                {
                    "fixed":  "9.9.1-alpha.11"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "8.6.81"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "97c6a78d19f976ec756c1295f08a8fccab90799a"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "be12a60d65b6e140481882037fb896b1f951df50"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "8.6.81",
            "range":  [
                {
                    "fixed":  "bccd92c768e7e793239f179718b804e7ce1ae125"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "9.9.1-alpha.11",
            "range":  [
                {
                    "fixed":  "ccf85f95b382a1efcea360f3ef3ba7f1bb3abde3"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

2.*
2.0.0
2.0.1
2.0.2
2.0.3
2.0.4
2.0.5
2.0.6
2.0.7
2.0.8
2.1.0
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.2.0
2.2.1
2.2.10
2.2.11
2.2.12
2.2.13
2.2.14
2.2.15
2.2.16
2.2.17
2.2.18
2.2.19
2.2.2
2.2.20
2.2.21
2.2.22
2.2.23
2.2.24
2.2.25
2.2.25-beta.1
2.2.3
2.2.4
2.2.5
2.2.6
2.2.7
2.2.8
2.2.9
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2.3.7
2.3.8
2.4.0
2.4.1
2.4.2
2.5.0
2.5.1
2.5.2
2.5.3
2.6.0
2.6.1
2.6.2
2.6.3
2.6.4
2.6.5
2.7.0
2.7.1
2.7.2
2.7.3
2.7.4
2.8.0
2.8.2
3.*
3.0.0
3.1.0
3.1.1
3.1.2
3.1.3
3.10.0
3.2.0
3.2.1
3.2.2
3.2.3
3.3.0
3.4.0
3.4.1
3.5.0
3.6.0
3.7.0
3.7.1
3.7.2
3.8.0
3.9.0
4.*
4.0.0
4.0.1
4.0.2
4.1.0
4.2.0
4.3.0
4.4.0
4.5.0
5.*
5.0.0
5.0.0-alpha.1
5.1.0
5.1.1
5.2.0
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.2.7
5.2.8
5.3.0
5.3.1
5.3.2
5.3.3
5.4.0
6.*
6.0.0
6.1.0
6.2.0
6.2.1
6.2.2
6.3.0
6.3.1
6.4.0
7.*
7.0.0
7.1.0
7.2.0
7.3.0
7.4.0
8.*
8.0.0
8.0.1
8.0.2
8.1.0
8.2.0
8.2.1
8.2.2
8.2.3
8.2.4
8.2.5
8.3.0
8.4.0
8.5.0
8.6.0
8.6.1
8.6.10
8.6.11
8.6.12
8.6.13
8.6.14
8.6.15
8.6.16
8.6.17
8.6.18
8.6.19
8.6.2
8.6.20
8.6.21
8.6.22
8.6.23
8.6.24
8.6.25
8.6.26
8.6.27
8.6.28
8.6.29
8.6.3
8.6.30
8.6.31
8.6.32
8.6.33
8.6.34
8.6.35
8.6.36
8.6.37
8.6.38
8.6.39
8.6.4
8.6.40
8.6.41
8.6.42
8.6.43
8.6.44
8.6.45
8.6.46
8.6.47
8.6.48
8.6.49
8.6.5
8.6.50
8.6.51
8.6.52
8.6.53
8.6.54
8.6.55
8.6.56
8.6.57
8.6.58
8.6.59
8.6.6
8.6.60
8.6.61
8.6.62
8.6.63
8.6.64
8.6.65
8.6.66
8.6.67
8.6.68
8.6.69
8.6.7
8.6.70
8.6.71
8.6.72
8.6.73
8.6.74
8.6.75
8.6.76
8.6.77
8.6.78
8.6.79
8.6.8
8.6.80
8.6.9
9.*
9.0.0
9.1.0
9.1.1
9.2.0
9.3.0
9.3.1
9.4.0
9.4.1
9.5.0
9.5.1
9.6.0
9.6.1
9.7.0
9.8.0
9.9.0
9.9.1-alpha.1
9.9.1-alpha.10
9.9.1-alpha.2
9.9.1-alpha.3
9.9.1-alpha.4
9.9.1-alpha.5
9.9.1-alpha.6
9.9.1-alpha.7
9.9.1-alpha.8
9.9.1-alpha.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55778.json"