CVE-2019-11831

CVE-2019-11831 is a critical-severity vulnerability in Typo3 Pharstreamwrapper with a CVSS 3.x base score of 9.8. 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-22.

Key facts

• Severity: Critical (CVSS 3.x base score 9.8)
• CVSS v2: 7.5
• EPSS exploit prediction: 6% (92nd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-22
• Affected product: Typo3 Pharstreamwrapper
• Published: 2019-05-09
• Last modified: 2026-06-17

Description

The PharStreamWrapper (aka phar-stream-wrapper) package 2.x before 2.1.1 and 3.x before 3.1.1 for TYPO3 does not prevent directory traversal, which allows attackers to bypass a deserialization protection mechanism, as demonstrated by a phar:///path/bad.phar/../good.phar URL.

Frequently asked questions

What is CVE-2019-11831?

The PharStreamWrapper (aka phar-stream-wrapper) package 2.x before 2.1.1 and 3.x before 3.1.1 for TYPO3 does not prevent directory traversal, which allows attackers to bypass a deserialization protection mechanism, as demonstrated by a phar:///path/bad.phar/../good.phar URL.

How severe is CVE-2019-11831?

CVE-2019-11831 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-11831 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-11831?

CVE-2019-11831 primarily affects Typo3 Pharstreamwrapper. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-11831?

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

When was CVE-2019-11831 published?

CVE-2019-11831 was published on 2019-05-09 and last updated on 2026-06-17.

References

• http://www.securityfocus.com/bid/108302
• https://github.com/TYPO3/phar-stream-wrapper/releases/tag/v2.1.1
• https://github.com/TYPO3/phar-stream-wrapper/releases/tag/v3.1.1
• https://lists.debian.org/debian-lts-announce/2019/05/msg00029.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/65ODQHDHWR74L6TCAPAQR5FQHG6MCXAW/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6QDJVUJPUW3RZ4746SC6BX4F4T6ZXNBH/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AUEXS4HRI4XZ2DTZMWAVQBYBTFSJ34AR/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E3NUKPG7V4QEM6QXRMHYR4ABFMW5MM2P/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U6JX7WR6DPMKCZQP7EYFACYXSGJ3K523/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z246UWBXBEKTQUDTLRJTC7XYBIO4IBE4/
• https://seclists.org/bugtraq/2019/May/36
• https://typo3.org/security/advisory/typo3-psa-2019-007/
• https://www.debian.org/security/2019/dsa-4445
• https://www.drupal.org/sa-core-2019-007
• https://www.synology.com/security/advisory/Synology_SA_19_22

Affected products (8)

• cpe:2.3:a:typo3:pharstreamwrapper:*:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
• cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
• cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
• cpe:2.3:a:joomla:joomla\!:*:*:*:*:*:*:*:*

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