CVE-2020-12676

9.1 CRITICAL 3% exploit odds Fix listed Crypto Web app

What it is

FusionAuth fusionauth-samlv2 0.2.3 allows remote attackers to forge messages and bypass authentication via a SAML assertion that lacks a Signature element, aka a "Signature exclusion attack".

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering.
Exploit odds: 2.9% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2020-10-02 20:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 02:52 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 2.9% in the next 30 days (EPSS).
Severity: 9.1 CRITICAL (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2020-10-02 20:15 UTC
Last modified: 2026-06-17 02:52 UTC
Exploit probability: 2.9% · EPSS, next 30 days
Weakness: CWE-347
Record status: Modified

Affected

Fusionauth samlv2 0.2.3

Attack profile CVSS 3.1 · 9.1

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Is it in your code?

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Read https://cve-list.com/agent/cve/CVE-2020-12676.md and follow it. Check whether this project is affected by CVE-2020-12676. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record