How severe is CVE-2026-26862?

CVE-2026-26862 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.

Is CVE-2026-26862 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-26862?

CVE-2026-26862 affects Clevertap Clevertap Web Sdk. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-26862?

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.

Does CVE-2026-26862 have an EU (EUVD) identifier?

Yes. CVE-2026-26862 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9039.

When was CVE-2026-26862 published?

CVE-2026-26862 was published on 2026-02-27 and last updated on 2026-06-17.

CVE-2026-26862

CVE-2026-26862 is a high-severity vulnerability in Clevertap Clevertap Web Sdk with a CVSS 3.x base score of 8.3. 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-79.

Key facts

Severity: High (CVSS 3.x base score 8.3)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9039
Weakness: CWE-79
Affected product: Clevertap Clevertap Web Sdk
Published: 2026-02-27
Last modified: 2026-06-17

Description

CleverTap Web SDK version 1.15.2 and earlier is vulnerable to DOM-based Cross-Site Scripting (XSS) via window.postMessage in the Visual Builder module. The origin validation in src/modules/visualBuilder/pageBuilder.js (lines 56-60) uses the includes() method to verify the originUrl contains "dashboard.clevertap.com", which can be bypassed by an attacker using a crafted subdomain

Frequently asked questions

What is CVE-2026-26862?: CleverTap Web SDK version 1.15.2 and earlier is vulnerable to DOM-based Cross-Site Scripting (XSS) via window.postMessage in the Visual Builder module. The origin validation in src/modules/visualBuilder/pageBuilder.js (lines 56-60) uses the includes() method to verify the originUrl contains "dashboard.clevertap.com", which can be bypassed by an attacker using a crafted subdomain
How severe is CVE-2026-26862?: CVE-2026-26862 has a CVSS 3.x base score of 8.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability low.
Is CVE-2026-26862 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-26862?: CVE-2026-26862 affects Clevertap Clevertap Web Sdk. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-26862?: 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.
Does CVE-2026-26862 have an EU (EUVD) identifier?: Yes. CVE-2026-26862 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9039.
When was CVE-2026-26862 published?: CVE-2026-26862 was published on 2026-02-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:clevertap:clevertap_web_sdk:*:*:*:*:*:*:*:*

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