Vulnerability Instance
Lookup for vulnerabilities affecting packages.
GET /api/vulnerabilities/278777?format=api
{ "url": "http://public2.vulnerablecode.io/api/vulnerabilities/278777?format=api", "vulnerability_id": "VCID-r2zf-yxr7-gke9", "summary": "Matrix iOS SDK allows developers to build iOS apps compatible with Matrix. Prior to version 0.23.19, an attacker cooperating with a malicious homeserver can construct messages that legitimately appear to have come from another person, without any indication such as a grey shield. Additionally, a sophisticated attacker cooperating with a malicious homeserver could employ this vulnerability to perform a targeted attack in order to send fake to-device messages appearing to originate from another user. This can allow, for example, to inject the key backup secret during a self-verification, to make a targeted device start using a malicious key backup spoofed by the homeserver. These attacks are possible due to a protocol confusion vulnerability that accepts to-device messages encrypted with Megolm instead of Olm. matrix-ios-sdk version 0.23.19 has been modified to only accept Olm-encrypted to-device messages. Out of caution, several other checks have been audited or added. This attack requires coordination between a malicious home server and an attacker, so those who trust their home servers do not need a workaround. To avoid malicious backup attacks, one should not verify one's new logins using emoji/QR verifications methods until patched.", "aliases": [ { "alias": "CVE-2022-39255" }, { "alias": "GHSA-hw6g-j8v6-9hcm" } ], "fixed_packages": [ { "url": "http://public2.vulnerablecode.io/api/packages/261034?format=api", "purl": "pkg:maven/org.matrix.android/matrix-android-sdk2@1.2.1", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-dvrk-p9dt-y7h6" }, { "vulnerability": "VCID-mwm6-1d7e-mfev" }, { "vulnerability": "VCID-vx5q-mbn5-8kcf" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:maven/org.matrix.android/matrix-android-sdk2@1.2.1" } ], "affected_packages": [ { "url": "http://public2.vulnerablecode.io/api/packages/261033?format=api", "purl": "pkg:maven/org.matrix.android/matrix-android-sdk2@0.0.2", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-dvrk-p9dt-y7h6" }, { "vulnerability": "VCID-k87r-mnjz-tkc9" }, { "vulnerability": "VCID-mwm6-1d7e-mfev" }, { "vulnerability": "VCID-r2zf-yxr7-gke9" }, { "vulnerability": "VCID-vx5q-mbn5-8kcf" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:maven/org.matrix.android/matrix-android-sdk2@0.0.2" } ], "references": [ { "reference_url": "https://api.first.org/data/v1/epss?cve=CVE-2022-39255", "reference_id": "", "reference_type": "", "scores": [ { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48051", "published_at": "2026-05-12T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48101", "published_at": "2026-04-02T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.4813", "published_at": "2026-04-21T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.4811", "published_at": "2026-04-24T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48121", "published_at": "2026-04-26T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48066", "published_at": "2026-04-29T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.47987", "published_at": "2026-05-05T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48053", "published_at": "2026-05-07T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48076", "published_at": "2026-05-09T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48022", "published_at": "2026-05-11T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48122", "published_at": "2026-04-04T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48072", "published_at": "2026-04-07T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48125", "published_at": "2026-04-08T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.4812", "published_at": "2026-04-09T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48143", "published_at": "2026-04-11T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48116", "published_at": "2026-04-12T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48127", "published_at": "2026-04-13T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.4818", "published_at": "2026-04-16T12:55:00Z" }, { "value": "0.00249", "scoring_system": "epss", "scoring_elements": "0.48175", "published_at": "2026-04-18T12:55:00Z" } ], "url": "https://api.first.org/data/v1/epss?cve=CVE-2022-39255" }, { "reference_url": "https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients", "reference_id": "", "reference_type": "", "scores": [ { "value": "8.6", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T15:50:43Z/" } ], "url": "https://matrix.org/blog/2022/09/28/upgrade-now-to-address-encryption-vulns-in-matrix-sdks-and-clients" }, { "reference_url": "https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c", "reference_id": "5ca86c328a5faaab429c240551cb9ca8f0f6262c", "reference_type": "", "scores": [ { "value": "8.6", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T15:50:43Z/" } ], "url": "https://github.com/matrix-org/matrix-ios-sdk/commit/5ca86c328a5faaab429c240551cb9ca8f0f6262c" }, { "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2022-39255", "reference_id": "CVE-2022-39255", "reference_type": "", "scores": [], "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-39255" }, { "reference_url": "https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-hw6g-j8v6-9hcm", "reference_id": "GHSA-hw6g-j8v6-9hcm", "reference_type": "", "scores": [ { "value": "8.6", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T15:50:43Z/" } ], "url": "https://github.com/matrix-org/matrix-ios-sdk/security/advisories/GHSA-hw6g-j8v6-9hcm" }, { "reference_url": "https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19", "reference_id": "v0.23.19", "reference_type": "", "scores": [ { "value": "8.6", "scoring_system": "cvssv3.1", "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N" }, { "value": "Track", "scoring_system": "ssvc", "scoring_elements": "SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-04-23T15:50:43Z/" } ], "url": "https://github.com/matrix-org/matrix-ios-sdk/releases/tag/v0.23.19" } ], "weaknesses": [ { "cwe_id": 287, "name": "Improper Authentication", "description": "When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct." }, { "cwe_id": 322, "name": "Key Exchange without Entity Authentication", "description": "The product performs a key exchange with an actor without verifying the identity of that actor." }, { "cwe_id": 1035, "name": "OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities", "description": "Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2017." }, { "cwe_id": 937, "name": "OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities", "description": "Weaknesses in this category are related to the A9 category in the OWASP Top Ten 2013." } ], "exploits": [], "severity_range_score": "8.6 - 8.6", "exploitability": "0.5", "weighted_severity": "7.7", "risk_score": 3.9, "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-r2zf-yxr7-gke9" }