How severe is CVE-2026-25526?

CVE-2026-25526 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-2026-25526 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25526?

CVE-2026-25526 affects Hubspot Jinjava. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25526?

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.

Does CVE-2026-25526 have an EU (EUVD) identifier?

Yes. CVE-2026-25526 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5336.

When was CVE-2026-25526 published?

CVE-2026-25526 was published on 2026-02-04 and last updated on 2026-06-17.

CVE-2026-25526

CVE-2026-25526 is a critical-severity vulnerability in Hubspot Jinjava 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-1336.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (55th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5336
Weakness: CWE-1336
Affected product: Hubspot Jinjava
Published: 2026-02-04
Last modified: 2026-06-17

Description

JinJava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Prior to versions 2.7.6 and 2.8.3, JinJava is vulnerable to arbitrary Java execution via bypass through ForTag. This allows arbitrary Java class instantiation and file access bypassing built-in sandbox restrictions. This issue has been patched in versions 2.7.6 and 2.8.3.

Frequently asked questions

What is CVE-2026-25526?: JinJava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Prior to versions 2.7.6 and 2.8.3, JinJava is vulnerable to arbitrary Java execution via bypass through ForTag. This allows arbitrary Java class instantiation and file access bypassing built-in sandbox restrictions. This issue has been patched in versions 2.7.6 and 2.8.3.
How severe is CVE-2026-25526?: CVE-2026-25526 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-2026-25526 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (55th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25526?: CVE-2026-25526 affects Hubspot Jinjava. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25526?: 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.
Does CVE-2026-25526 have an EU (EUVD) identifier?: Yes. CVE-2026-25526 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5336.
When was CVE-2026-25526 published?: CVE-2026-25526 was published on 2026-02-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hubspot:jinjava:*:*:*:*:*:*:*:*

More vulnerabilities in Hubspot Jinjava

CVE-2025-59340 — Critical (CVSS 9.8): jinjava is a Java-based template engine based on django template syntax, adapted to render jinja templates. Priori to…
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