{"id":"CVE-2021-32738","aliases":["GHSA-6cgh-hjpw-q3gq"],"url":"https://o3.security/vulnerability/CVE-2021-32738","summary":"Utils.readChallengeTx does not verify the server account signature","details":"js-stellar-sdk is a Javascript library for communicating with a Stellar Horizon server. The `Utils.readChallengeTx` function used in SEP-10 Stellar Web Authentication states in its function documentation that it reads and validates the challenge transaction including verifying that the `serverAccountID` has signed the transaction. In js-stellar-sdk before version 8.2.3, the function does not verify that the server has signed the transaction. Applications 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. Applications calling `Utils.readChallengeTx` should update to version 8.2.3, the first version with a patch for this vulnerability, to ensure that the challenge transaction is completely valid and signed by the server creating the challenge transaction.","published":"2021-07-02T19:15:08.063Z","modified":"2026-07-09T10:11:49.544601Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"stellar-sdk","fixedVersion":"8.2.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/stellar/js-stellar-sdk/releases/tag/v8.2.3"},{"type":"ADVISORY","url":"https://github.com/stellar/js-stellar-sdk/security/advisories/GHSA-6cgh-hjpw-q3gq"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T10:11:49.544601Z"}}