Vulnerability · Published Aug 25, 2026 · Assigned by TYPO3

CVE-2026-56095Insecure Deserialization in extension "Apache Solr for TYPO3 - Enterprise Search" (solr)

High 7.7

In plain English

A high-severity unsafe deserialization in Extension "Apache Solr for TYPO3 - Enterprise Search" from TYPO3. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).

Severity (CVSS 4.0)7.7High

Exploit odds (30 days)0.3%top 75.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

The extension's indexer passed every field value returned by content object rendering through PHP's unserialize() function when transferring multi-value data for the SOLR_CLASSIFICATION, SOLR_MULTIVALUE and SOLR_RELATION content object types, rather than a safe format. If user-generated content saved in the TYPO3 database can reach an indexed field, this exposes a PHP Object Injection surface.

Affected products (as reported)

Vendor	Product	Versions
TYPO3	Extension "Apache Solr for TYPO3 - Enterprise Search"	13.0.0 – before 13.1.412.0.0 – before 12.1.411.5.0 – before 11.6.6

Weakness: CWE-502 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

https://typo3.org/security/advisory/typo3-ext-sa-2026-025 vendor-advisory