CVE-2020-15098

Name: CVE-2020-15098
Creator: NVD / NIST
Published: 2020-07-29T17:15:13.387+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.23%

Last modified Jun 17, 2026

CVE-2020-15098 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. In TYPO3 CMS greater than or equal to 9.0.0 and less than 9.5.20, and greater than or equal to 10.0.0 and less than 10.4.6, it has been discovered that an internal verification mechanism can be used to generate arbitrary checksums. This allows to inject arbitrary data having a valid cryptographic message authentication code (HMAC-SHA1) and can lead to various attack chains including potential privilege escalation, insecure deserialization & remote code execution. EPSS estimates a 2.23% chance of exploitation in the next 30 days.

Description

In TYPO3 CMS greater than or equal to 9.0.0 and less than 9.5.20, and greater than or equal to 10.0.0 and less than 10.4.6, it has been discovered that an internal verification mechanism can be used to generate arbitrary checksums. This allows to inject arbitrary data having a valid cryptographic message authentication code (HMAC-SHA1) and can lead to various attack chains including potential privilege escalation, insecure deserialization & remote code execution. The overall severity of this vulnerability is high based on mentioned attack chains and the requirement of having a valid backend user session (authenticated). This has been patched in versions 9.5.20 and 10.4.6.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

2.23%

80.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Typo3	Typo3	>= 9.0.0, < 9.5.20
Typo3	Typo3	>= 10.0.0, < 10.4.6

References

https://github.com/TYPO3/TYPO3.CMS/commit/85d3e70dff35a99ef53f4b561114acfa9e5c47e1Broken Link
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-m5vr-3m74-jwxpThird Party Advisory
https://typo3.org/security/advisory/typo3-core-sa-2016-013Vendor Advisory
https://typo3.org/security/advisory/typo3-core-sa-2020-008Vendor Advisory
https://github.com/TYPO3/TYPO3.CMS/commit/85d3e70dff35a99ef53f4b561114acfa9e5c47e1Broken Link
https://github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-m5vr-3m74-jwxpThird Party Advisory
https://typo3.org/security/advisory/typo3-core-sa-2016-013Vendor Advisory
https://typo3.org/security/advisory/typo3-core-sa-2020-008Vendor Advisory

Timeline

Published: Jul 29, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15098?

How severe is CVE-2020-15098?

CVE-2020-15098 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.23% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15098?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-15098?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST