CVE-2020-28482Network attack vector

CSRF bypass via exposed tokens and insecure cookies

Published Jan 19, 2021 · Updated Sep 16, 2024

CSRF weakness in Fastify @fastify/csrf-protection before 3.0.0 allows remote attackers to bypass request validation via exposed tokens. The default token extractor accepts a token from the GET query string, while generated cookies omit httpOnly and expose their contents to scripts. Exploitation requires user interaction with an attacker-controlled request and can submit state-changing actions with the victim's privileges.

CVSS severity5.9
Medium
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF weakness in Fastify @fastify/csrf-protection before 3.0.0 allows remote attackers to bypass request validation via exposed tokens. The default token extractor accepts a token from the GET query string, while generated cookies omit httpOnly and expose their contents to scripts. Exploitation requires user interaction with an attacker-controlled request and can submit state-changing actions with the victim's privileges.

The record

CVE
CVE-2020-28482
Published
Jan 19, 2021
Updated
Sep 16, 2024
Vendor
Fastify
Product
@fastify/csrf-protection
Classifications
CWE-200, CWE-732
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <3.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fastify · @fastify/csrf-protectionversion=unspecified <3.0.0

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
5.9SnykCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-732Incorrect Permission Assignment for Critical Resource

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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