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CVE-2021-29451

Missing validation of JWT signature in `ManyDesigns/Portofino`

CRITICAL
9.1
CVSS Score
Published: April 16, 2021 at 09:40 PM UTC
Updated: June 17, 2026 at 03:47 AM UTC
1 product affected across 1 vendorPortofino

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Severity
CRITICAL9.1
Exploit prediction
EPSS 0.9%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Portofino· Manydesignsmaven
95%
v < 5.2.15.0.0 ≤ v < 5.2.1
Affected range stops below 5.2.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/ManyDesigns/Portofino/commit/8c754a0ad234555e813dcbf9e57d637f9f23d8fb
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/ManyDesigns/Portofino/security/advisories/GHSA-6g3c-2mh5-7q6x
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://mvnrepository.com/artifact/com.manydesigns/portofino

CVSS

9.1CRITICALGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-347

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