Larabr

**Name of the Vulnerable Software and Affected Versions** OpenPGP.js versions up to 5.9.0 OpenPGP.js version 5.10.1 (current stable version) is not affected, and version 4.10.11 (legacy version) is also not affected. **Description** OpenPGP.js is a JavaScript implementation of the OpenPGP protocol. In affected versions, OpenPGP Cleartext Signed Messages are cryptographically signed messages where the signed text is readable without special tools. These messages typically contain a "Hash: ..." header declaring the hash algorithm used to compute the signature digest. OpenPGP.js up to v5.9.0 ignored any data preceding the "Hash: ..." texts when verifying the signature. As a result, malicious parties could add arbitrary text to a third-party Cleartext Signed Message, to lead the victim to believe that the arbitrary text was signed. A user or application is vulnerable to said attack vector if it verifies the CleartextMessage by only checking the returned `verified` property, discarding the associated `data` information, and instead visually trusting the contents of the original message. Since `verificationResult.data` would always contain the actual signed data, users and apps that check this information are not vulnerable. **Recommendations** For OpenPGP.js versions up to 5.9.0, upgrade to version 5.10.1 (current stable version) or version 4.10.11 (legacy version) to resolve the issue. For users unable to upgrade, check the contents of `verificationResult.data` to see what data was actually signed, rather than visually trusting the contents of the armored message. As a temporary workaround, consider verifying the CleartextMessage by checking the `verificationResult.data` information, rather than only relying on the `verified` property.