How severe is CVE-2026-71291?

CVE-2026-71291 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-71291 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-71291?

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-2026-71291 published?

CVE-2026-71291 was published on 2026-08-05 and last updated on 2026-08-10.

CVE-2026-71291

CVE-2026-71291 is a high-severity vulnerability with a CVSS 3.x base score of 8.8. 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-1336.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1336
Published: 2026-08-05
Last modified: 2026-08-10

Description

Bolt CMS renders content field values through Twig's full application-level Environment with no SandboxExtension registered anywhere in the codebase. In src/Entity/Field.php, getTwigValue calls shouldBeRenderedAsTwig, which gates rendering only on the field definition's allow_twig flag and a regex checking for , , or ; when true, the raw field value is compiled and rendered via with no sandboxing.

Frequently asked questions

What is CVE-2026-71291?: Bolt CMS renders content field values through Twig's full application-level Environment with no SandboxExtension registered anywhere in the codebase. In src/Entity/Field.php, getTwigValue calls shouldBeRenderedAsTwig, which gates rendering only on the field definition's allow_twig flag and a regex checking for , , or ; when true, the raw field value is compiled and rendered via with no sandboxing.
How severe is CVE-2026-71291?: CVE-2026-71291 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-71291 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-71291?: 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-2026-71291 published?: CVE-2026-71291 was published on 2026-08-05 and last updated on 2026-08-10.

References

Other CWE-1336 vulnerabilities

CVE-2026-48323 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Improper Neutralization of Special Elements Used in a Template Engine…
CVE-2026-44181 — Critical (CVSS 10.0): Jupyter Enterprise Gateway launches remote Jupyter Notebook kernels across distributed clusters like Apache Spark,…
CVE-2025-53833 — Critical (CVSS 10.0): LaRecipe is an application that allows users to create documentation with Markdown inside a Laravel app. Versions prior…
CVE-2024-32651 — Critical (CVSS 10.0): changedetection.io is an open source web page change detection, website watcher, restock monitor and notification…
CVE-2026-65974 — Critical (CVSS 9.9): ERPNext is a free and open source Enterprise Resource Planning tool. Prior to 15.111.0 and 16.22.0, limited…
CVE-2026-72911 — Critical (CVSS 9.9): ERPNext is a free and open source Enterprise Resource Planning tool. Prior to 15.118.0 and 16.29.0, the…

Browse all CWE-1336 vulnerabilities →