Every CVE Search/ Get API key

CVE-2020-15098

Missing Required Cryptographic Step Leading to Sensitive Information Disclosure in TYPO3 CMS

8.8 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

2.23%Unchanged since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 8.8

Missing Required Cryptographic Step Leading to Sensitive Information Disclosure in TYPO3 CMS

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.

Record
CVE-2020-15098
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-325, CWE-20, CWE-200, CWE-502
Updated
2026-11-02
EUVDEUVD-2020-0564 8.8

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.

Record
EUVD-2020-0564
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-m5vr-3m74-jwxp 8.8

Missing Required Cryptographic Step Leading to Sensitive Information Disclosure in TYPO3 CMS

Meta

  • CVSS: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C (8.2)
  • CWE-325, CWE-20, CWE-200, CWE-502

Problem

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 as described below.

  • TYPO3-CORE-SA-2020-007, CVE-2020-15099: Potential Privilege Escalation
    • the database server used for a TYPO3 installation must be accessible for an attacker (either via internet or shared hosting network)
    • CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C (7.5, high)
  • TYPO3-CORE-SA-2016-013, CVE-2016-5091: Insecure Deserialization & Remote Code Execution
    • an attacker must have access to at least one Extbase plugin or module action in a TYPO3 installation
    • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C (9.1, critical)

The overall severity of this vulnerability is high (8.2) based on mentioned attack chains and the requirement of having a valid backend user session (authenticated).

Solution

Update to TYPO3 versions 9.5.20 or 10.4.6 that fix the problem described.

Credits

Thanks to TYPO3 security team member Oliver Hader who reported and fixed the issue.

References

Record
GHSA-m5vr-3m74-jwxp
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-20, CWE-200, CWE-325, CWE-327, CWE-502
Updated
2026-11-02
NVD 8.8

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.

Record
CVE-2020-15098
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Weakness
CWE-20, CWE-200, CWE-325, CWE-502, CWE-327
Updated
2026-11-02
OSV 8.8

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.

Record
CVE-2020-15098
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVGHSA-m5vr-3m74-jwxp 8.8

Missing Required Cryptographic Step Leading to Sensitive Information Disclosure in TYPO3 CMS

Meta

  • CVSS: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C (8.2)
  • CWE-325, CWE-20, CWE-200, CWE-502

Problem

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 as described below.

  • TYPO3-CORE-SA-2020-007, CVE-2020-15099: Potential Privilege Escalation
    • the database server used for a TYPO3 installation must be accessible for an attacker (either via internet or shared hosting network)
    • CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C (7.5, high)
  • TYPO3-CORE-SA-2016-013, CVE-2016-5091: Insecure Deserialization & Remote Code Execution
    • an attacker must have access to at least one Extbase plugin or module action in a TYPO3 installation
    • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C (9.1, critical)

The overall severity of this vulnerability is high (8.2) based on mentioned attack chains and the requirement of having a valid backend user session (authenticated).

Solution

Update to TYPO3 versions 9.5.20 or 10.4.6 that fix the problem described.

Credits

Thanks to TYPO3 security team member Oliver Hader who reported and fixed the issue.

References

Record
GHSA-m5vr-3m74-jwxp
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-20, CWE-200, CWE-325, CWE-327, CWE-502
Updated
2026-11-02
OSVBIT-typo3-2020-15098 No score

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.

Record
BIT-typo3-2020-15098
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
typo3/cms-core
Packagist
 9.0.0 up to 9.5.20
9.5.20
typo3/cms-core
Packagist
 10.0.0 up to 10.4.6
10.4.6
typo3/cms
Packagist
 10.0.0 up to 10.4.6
10.4.6
typo3/cms
Packagist
 9.0.0 up to 9.5.20
9.5.20
typo3
Bitnami
 9.0.0 up to 9.5.20, 10.0.0 up to 10.4.6
9.5.2010.4.6
typo3/cms-core
Packagist
 9.0.0 up to 9.5.20, plus listed versions
v9.0.0v9.1.0v9.2.0v9.2.1v9.3.0
Show 24 moreShow less
v9.3.1v9.3.2v9.3.3v9.4.0v9.5.0v9.5.1v9.5.10v9.5.11v9.5.12v9.5.13v9.5.14v9.5.15v9.5.16v9.5.17v9.5.18v9.5.19v9.5.2v9.5.3v9.5.4v9.5.5v9.5.6v9.5.7v9.5.8v9.5.9
9.5.20
typo3/cms-core
Packagist
 10.0.0 up to 10.4.6, plus listed versions
v10.0.0v10.1.0v10.2.0v10.2.1v10.2.2
Show 7 moreShow less
v10.3.0v10.4.0v10.4.1v10.4.2v10.4.3v10.4.4v10.4.5
10.4.6
typo3/cms
Packagist
 10.0.0 up to 10.4.6, plus listed versions
v10.0.0v10.1.0v10.2.0v10.2.1v10.2.2
Show 7 moreShow less
v10.3.0v10.4.0v10.4.1v10.4.2v10.4.3v10.4.4v10.4.5
10.4.6
typo3/cms
Packagist
 9.0.0 up to 9.5.20, plus listed versions
v9.0.0v9.1.0v9.2.0v9.2.1v9.3.0
Show 24 moreShow less
v9.3.1v9.3.2v9.3.3v9.4.0v9.5.0v9.5.1v9.5.10v9.5.11v9.5.12v9.5.13v9.5.14v9.5.15v9.5.16v9.5.17v9.5.18v9.5.19v9.5.2v9.5.3v9.5.4v9.5.5v9.5.6v9.5.7v9.5.8v9.5.9
9.5.20

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-15098 is a high vulnerability (CVSS 8.8) in Typo3, published July 29, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.23%, the 82nd percentile. Fixed in typo3/cms-core 9.5.20.

References

Show 4 moreShow less
Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open