CVE-2021-31590

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-07-19 · updated 2026-06-17

Description

PwnDoc all versions until 0.4.0 (2021-08-23) has incorrect JSON Webtoken handling, leading to incorrect access control. With a valid JSON Webtoken that is used for authentication and authorization, a user can keep his admin privileges even if he is downgraded to the "user" privilege. Even after a user's account is deleted, the user can still access the administration panel (and add or delete users) and has complete access to the system.

Affected products

pwndoc: before 0.4.0 — fixed in 0.4.0

How to fix

Upgrade to a fixed version: pwndoc 0.4.0. Check the vendor advisory for mitigations.

References

https://github.com/pwndoc/pwndoc/blob/59519735b0d831d8fd96d7c3387f66d28407e583/CHANGELOG.md#040-2021-08-23
https://github.com/pwndoc/pwndoc/commit/15f3dc0e212eda465e05fda0feb002d1bce2939d
https://github.com/pwndoc/pwndoc/commit/ff1b868cec55f5b6c7a91e15a2b0b1f4324121ab
https://github.com/pwndoc/pwndoc/pull/128
https://github.com/pwndoc/pwndoc/pull/74
https://github.com/pwndoc/pwndoc/security/advisories
https://www.dgc.org/responsible_disclosure_pwndoc_jwt
https://github.com/pwndoc/pwndoc/blob/59519735b0d831d8fd96d7c3387f66d28407e583/CHANGELOG.md#040-2021-08-23
https://github.com/pwndoc/pwndoc/commit/15f3dc0e212eda465e05fda0feb002d1bce2939d
https://github.com/pwndoc/pwndoc/commit/ff1b868cec55f5b6c7a91e15a2b0b1f4324121ab
https://github.com/pwndoc/pwndoc/pull/128
https://github.com/pwndoc/pwndoc/pull/74

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