CVE-2023-27580
mediumpriority · track · 24EPSS 0.005 · 44 %ileEUUSEPSS · scored 2026-10-27
CodeIgniter Shield provides authentication and authorization for the CodeIgniter 4 PHP framework. An improper implementation was found in the password storage process. All hashed passwords stored in Shield v1.0.0-beta.3 or earlier are easier to crack than expected due to the vulnerability. Therefore, they should be removed as soon as possible. If an attacker gets (1) the user's hashed password by Shield, and (2) the hashed password (SHA-384 hash without salt) from somewhere, the attacker may easily crack the user's password. Upgrade to Shield v1.0.0-beta.4 or later to fix this issue. After upgrading, all users’ hashed passwords should be updated (saved to the database). There are no known workarounds.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.4–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-c5vj-f36q-p9vgPassword Shucking Vulnerability2023-03-13ghsa · osvUS
### Impact An improper implementation was found in the password storage process. All hashed passwords stored in Shield v1.0.0-beta.3 or earlier are easier to crack than expected due to the vulnerability. Therefore, they should be removed as soon as possible. If an attacker gets (1) the user's hashed password by Shield, and (2) the hashed password (SHA-384 hash without salt) from somewhere, the attacker may easily crack the user's password. ### Patches Upgrade to Shield v1.0.0-beta.4 or later. After upgrading, all users’ hashed passwords should be updated (saved to the database). See https://github.com/codeigniter4/shield/blob/develop/UPGRADING.md for details. ### Workarounds None. ### References - https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#pre-hashing-passwords - https://blog.ircmaxell.com/2015/03/security-issue-combining-bcrypt-with.html - https://www.scottbrady91.com/authentication/beware-of-password-shucking ### For more information If you have any questions or comments about this advisory: * Open an issue or discussion in [codeigniter4/shield](https://github.com/codeigniter4/shield) * Email us at [security@codeigniter.com](mailto:security@codeigniter.com)
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (19)
External citations — patches, advisories, analysis.
- https://blog.ircmaxell.com/2015/03/security-issue-combining-bcrypt-with.htmlcnnvd
- https://cheatsheetseries.owasp.org/cheatsheets/Password_Storage_Cheat_Sheet.html#pre-hashing-passwordscnnvd
- https://cxsecurity.com/cveshow/CVE-2023-27580/cnnvd
- https://github.com/codeigniter4/shield/blob/develop/UPGRADING.mdcnnvd
- https://github.com/codeigniter4/shield/commit/ea9688dd01d100193d834117dbfc2cfabcf9ea0bcnnvd
- https://github.com/codeigniter4/shield/security/advisories/GHSA-c5vj-f36q-p9vgcnnvd
- https://www.scottbrady91.com/authentication/beware-of-password-shuckingcnnvd
- https://blog.ircmaxell.com/2015/03/security-issue-combining-bcrypt-with.htmlenisa_euvd
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