What is CVE-2020-15099?

CVE-2020-15099 is a high-severity vulnerability in TYPO3, classified under Improper Input Validation. CVSS score: 8.1/10. Published 2020-07-29.

How severe is CVE-2020-15099?

High severity. CVSS v3 base score is 8.1 out of 10.

Is CVE-2020-15099 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in TYPO3

CVE-2020-15099

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, in a case where an attacker manages to generate a valid cryptographic message authentication code (HMAC-SHA1) - either by using a different existing vulnerability or in case the internal encryptionKey was exposed - it is possible to retrieve arbitrary files of a TYPO3 installation. This includes the possibility to fetch typo3conf/LocalConfiguration.php, which again contains the encryptionKey as well as credentials of the database management system being used. In case a database server is directly accessible either via internet or in a shared hosting network, this allows the ability to completely retrieve, manipulate or delete database contents. This includes creating an administration user account - which can be used to trigger remote code execution by injecting custom extensions. This has been patched in versions 9.5.20 and 10.4.6.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-07-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (78.2th percentile), scored 2026-10-23.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: +0.000

Affected products

TYPO3
TYPO3 Cms — versions >= 9.0.0, < 9.5.20, >= 10.0.0, 10.4.6

Weakness classification (CWE)

Public proof-of-concept exploits

Dread1ess/CVE-2020-15099

References

github.com/TYPO3/TYPO3.CMS/security/advisories/GHSA-3x94-fv5h-5q2c (Vendor Advisory)
typo3.org/security/advisory/typo3-core-sa-2020-007 (Vendor Advisory)

Frequently asked questions

What is CVE-2020-15099?: CVE-2020-15099 is a high-severity vulnerability in TYPO3, classified under Improper Input Validation. CVSS score: 8.1/10. Published 2020-07-29.
How severe is CVE-2020-15099?: High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2020-15099 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.