CVE-2021-29500: Missing validation of JWT signature

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-06-04 · updated 2026-06-17
Weakness: CWE-347

Description

bubble fireworks is an open source java package relating to Spring Framework. In bubble fireworks before version 2021.BUILD-SNAPSHOT there is a vulnerability in which the package did not properly verify the signature of JSON Web Tokens. This allows to forgery of valid JWTs.

Affected products

fxbin bubble-fireworks: before 2021.build-snapshot — fixed in 2021.build-snapshot

How to fix

Upgrade to a fixed version: fxbin bubble-fireworks 2021.build-snapshot. Check the vendor advisory for mitigations.

References

https://github.com/fxbin/bubble-fireworks/security/advisories/GHSA-hj36-84cp-29pr
https://github.com/fxbin/bubble-fireworks/security/advisories/GHSA-hj36-84cp-29pr

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