CVE-2026-26862
DOM-based XSS in CleverTap Web SDK via postMessage origin check bypass
Is CVE-2026-26862 being exploited?
Not confirmed. CVE-2026-26862 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.37% probability of exploitation in the next 30 days.
How severe is CVE-2026-26862?
CVE-2026-26862 is rated High with a CVSS score of 8.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-26862?
Yes. A fix has been recorded for CVE-2026-26862. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-26862 affect?
CVE-2026-26862 affects CleverTap Web SDK <= 1.15.2, CleverTap Visual Builder module. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-26862?
Upgrade to latest CleverTap SDK; review postMessage handling and origin validation
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Arbitrary script execution in victim's browser via crafted postMessage; origin check bypass can enable data theft and session hijack.
Patch when possible