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

Unknown severity · Source severity not reportedCVE-2026-56095

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

Answer in brief

CVE-2026-56095 records a Unknown severity vulnerability in Insecure Deserialization in extension "Apache Solr for TYPO3 - Enterprise Search" (solr). The current sources do not mark it as known exploited. The current feed maps TYPO3/Extension "Apache Solr for TYPO3 - Enterprise Search" (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 25, 2026Updated Aug 25, 2026Source checked Aug 25, 2026First seen by HOL Aug 25, 2026Material review Aug 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps TYPO3/Extension "Apache Solr for TYPO3 - Enterprise Search" (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
TYPO3/Extension "Apache Solr for TYPO3 - Enterprise Search"generic	>=13.0.0 <13.1.4 \|\| >=12.0.0 <12.1.4 \|\| >=0 <11.6.6	13.1.4, 12.1.4, 11.6.6

Recommended response

Check inventory. Check lockfiles and deployed manifests for TYPO3/Extension "Apache Solr for TYPO3 - Enterprise Search".
Review the reported fix. Update TYPO3/Extension "Apache Solr for TYPO3 - Enterprise Search" to 13.1.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 25, 2026

Sources and claim methodology

Source referencetypo3.org

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.