CVE-2021-29451
Missing validation of JWT signature in `ManyDesigns/Portofino`
Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT. The issue will be patched in the upcoming 5.2.1 release.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Missing validation of JWT signature in `ManyDesigns/Portofino`
Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT. The issue will be patched in the upcoming 5.2.1 release.
- Record
CVE-2021-29451- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-347
- Updated
- 2026-11-02
EUVDEUVD-2021-0773
Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT. The issue will be patched in the upcoming 5.2.1 release.
- Record
EUVD-2021-0773- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-6g3c-2mh5-7q6x
Missing validation of JWT signature in `ManyDesigns/Portofino`
Impact
Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT.
Patches
The issue will be patched in the upcoming 5.2.1 release.
For more information
If you have any questions or comments about this advisory:
- Open an issue in https://github.com/ManyDesigns/Portofino
- Record
GHSA-6g3c-2mh5-7q6x- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-347
- Updated
- 2026-11-02
NVD
Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT. The issue will be patched in the upcoming 5.2.1 release.
- Record
CVE-2021-29451- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - CVSS 2.0
- 6.4 Medium
AV:N/AC:L/Au:N/C:P/I:P/A:N - Weakness
- CWE-347
- Updated
- 2026-11-02
OSV
Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT. The issue will be patched in the upcoming 5.2.1 release.
- Record
CVE-2021-29451- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Updated
- 2026-11-02
OSVGHSA-6g3c-2mh5-7q6x
Missing validation of JWT signature in `ManyDesigns/Portofino`
Impact
Portofino is an open source web development framework. Portofino before version 5.2.1 did not properly verify the signature of JSON Web Tokens. This allows forging a valid JWT.
Patches
The issue will be patched in the upcoming 5.2.1 release.
For more information
If you have any questions or comments about this advisory:
- Open an issue in https://github.com/ManyDesigns/Portofino
- Record
GHSA-6g3c-2mh5-7q6x- CVSS 3.1
- 9.1 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N - Weakness
- CWE-347
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
com.manydesigns:portofino-dispatcherMaven |
5.0.0 up to 5.2.1 | 5.2.1 |
com.manydesigns:portofino-coreMaven |
5.0.0 up to 5.2.1 | 5.2.1 |
com.manydesigns:portofino-dispatcherMaven |
5.0.0 up to 5.2.1, plus listed versions 5.0.15.0.25.0.35.1.05.1.1 Show 4 moreShow less5.1.25.1.35.1.45.2.0 |
5.2.1 |
com.manydesigns:portofino-coreMaven |
5.0.0 up to 5.2.1, plus listed versions 5.0.15.0.25.0.35.1.05.1.1 Show 4 moreShow less5.1.25.1.35.1.45.2.0 |
5.2.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-29451 is a critical vulnerability (CVSS 9.1) in Manydesigns Portofino, published April 16, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.95%, the 61st percentile. Fixed in com.manydesigns:portofino-dispatcher 5.2.1.