{"id":"GHSA-6cgh-hjpw-q3gq","summary":"Utils.readChallengeTx does not verify the server account signature","details":"The `Utils.readChallengeTx` function used in [SEP-10 Stellar Web Authentication](https://github.com/stellar/stellar-protocol/blob/master/ecosystem/sep-0010.md) states in its function documentation that it reads and validates the challenge transaction including verifying that the `serverAccountID` has signed the transaction. The function does not verify that the server has signed the transaction and has been fixed so that it does in v8.2.3.\n\nApplications that also used `Utils.verifyChallengeTxThreshold` or `Utils.verifyChallengeTxSigners` to verify the signatures including the server signature on the challenge transaction are unaffected as those functions verify the server signed the transaction.\n\nApplications calling `Utils.readChallengeTx` should update to v8.2.3 to ensure that the challenge transaction is completely valid and signed by the server creating the challenge transaction.","aliases":["CVE-2021-32738"],"modified":"2026-05-07T05:00:55.285618616Z","published":"2021-07-02T19:20:33Z","database_specific":{"github_reviewed_at":"2021-07-02T18:25:08Z","nvd_published_at":"2021-07-02T19:15:00Z","cwe_ids":["CWE-287","CWE-347"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/stellar/js-stellar-sdk/security/advisories/GHSA-6cgh-hjpw-q3gq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-32738"},{"type":"WEB","url":"https://github.com/stellar/js-stellar-sdk/commit/6f0bb889c2d10b431ddd5f4a1bcdd519c80430b3"},{"type":"WEB","url":"https://github.com/stellar/js-stellar-sdk/releases/tag/v8.2.3"}],"affected":[{"package":{"name":"stellar-sdk","ecosystem":"npm","purl":"pkg:npm/stellar-sdk"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.2.3"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/07/GHSA-6cgh-hjpw-q3gq/GHSA-6cgh-hjpw-q3gq.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"}]}