What’s Vulnerable › Vulnerabilities

CVE-2020-36533: Klapp App JSON Web Token improper authentication

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-06-07 · updated 2026-06-17
• Weakness: CWE-287

Description

A vulnerability was found in Klapp App and classified as problematic. This issue affects some unknown processing of the JSON Web Token Handler. The manipulation leads to weak authentication. The attack may be initiated remotely.

Affected products

• Klapp App: all versions

References

• https://vuldb.com/?id.160763
• https://www.modzero.com/modlog/archives/2020/09/07/knapp_daneben_ist_auch_vorbei/index.html
• https://vuldb.com/?id.160763
• https://www.modzero.com/modlog/archives/2020/09/07/knapp_daneben_ist_auch_vorbei/index.html

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