How severe is CVE-2016-5091?

CVE-2016-5091 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-5091 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-5091?

CVE-2016-5091 primarily affects Typo3. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-5091?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-5091 published?

CVE-2016-5091 was published on 2017-01-23 and last updated on 2026-06-17.

CVE-2016-5091

CVE-2016-5091 is a high-severity vulnerability in Typo3 with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-254.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-254
Affected product: Typo3
Published: 2017-01-23
Last modified: 2026-06-17

Description

Extbase in TYPO3 4.3.0 before 6.2.24, 7.x before 7.6.8, and 8.1.1 allows remote attackers to obtain sensitive information or possibly execute arbitrary code via a crafted Extbase action.

Frequently asked questions

What is CVE-2016-5091?: Extbase in TYPO3 4.3.0 before 6.2.24, 7.x before 7.6.8, and 8.1.1 allows remote attackers to obtain sensitive information or possibly execute arbitrary code via a crafted Extbase action.
How severe is CVE-2016-5091?: CVE-2016-5091 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-5091 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-5091?: CVE-2016-5091 primarily affects Typo3. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-5091?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-5091 published?: CVE-2016-5091 was published on 2017-01-23 and last updated on 2026-06-17.

References

Affected products (19)

cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.0.0:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.0.2:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.1.0:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.2.0:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.3.0:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.3.1:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.4.0:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.5.0:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.6.0:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.6.1:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.6.2:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.6.3:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.6.4:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.6.5:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.6.6:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.6.7:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:7.6.8:*:*:*:*:*:*:*
cpe:2.3:a:typo3:typo3:8.1.1:*:*:*:*:*:*:*

More vulnerabilities in Typo3

CVE-2009-0258 — Critical (CVSS 10.0): The Indexed Search Engine (indexed_search) system extension in TYPO3 4.0.0 through 4.0.9, 4.1.0 through 4.1.7, and…
CVE-2011-3583 — Critical (CVSS 9.8): It was found that Typo3 Core versions 4.5.0 - 4.5.5 uses prepared statements that, if the parameter values are not…
CVE-2011-4628 — Critical (CVSS 9.8): TYPO3 before 4.3.12, 4.4.x before 4.4.9, and 4.5.x before 4.5.4 allows remote attackers to bypass authentication…
CVE-2025-59017 — High (CVSS 8.8): Missing authorization checks in the Backend Routing of TYPO3 CMS versions 9.0.0‑9.5.54, 10.0.0‑10.4.53,…
CVE-2023-24814 — High (CVSS 8.8): TYPO3 is a free and open source Content Management Framework released under the GNU General Public License. In affected…
CVE-2021-41113 — High (CVSS 8.8): TYPO3 is an open source PHP based web content management system released under the GNU GPL. It has been discovered that…

All CVEs affecting Typo3 →

Other CWE-254 vulnerabilities

CVE-2016-5788 — Critical (CVSS 10.0): General Electric (GE) Bently Nevada 3500/22M USB with firmware before 5.0 and Bently Nevada 3500/22M Serial have open…
CVE-2015-3972 — Critical (CVSS 10.0): The web interface on Janitza UMG 508, 509, 511, 604, and 605 devices supports only short PIN values for authentication,…
CVE-2015-1158 — Critical (CVSS 10.0): The add_job function in scheduler/ipp.c in cupsd in CUPS before 2.0.3 performs incorrect free operations for…
CVE-2019-15149 — Critical (CVSS 9.8): core.py in Mitogen before 0.2.8 has a typo that drops the unidirectional-routing protection mechanism in the case of a…
CVE-2017-8227 — Critical (CVSS 9.8): Amcrest IPM-721S V2.420.AC00.16.R.20160909 devices have a timeout policy to wait for 5 minutes in case 30 incorrect…
CVE-2016-9568 — Critical (CVSS 9.8): A security design issue can allow an unprivileged user to interact with the Carbon Black Sensor and perform…

Browse all CWE-254 vulnerabilities →