Security readout for executives and security teams
Plain-English summary
CVE-2026-26862 affects CleverTap Web SDK 1.15.2 and earlier. A website using the SDK’s Visual Builder module could be exposed to DOM-based XSS if a user interacts with attacker-controlled content. Impact can include theft or manipulation of browser-accessible data. Public sources do not show active exploitation.
Executive priority
Treat as a high-priority web application dependency review. The business risk is browser-side compromise on sites using the affected SDK, but remediation details are incomplete. Prioritize inventory and vendor tracking now, then deploy the confirmed fix when available.
Technical view
The issue is improper origin validation in src/modules/visualBuilder/pageBuilder.js. The code reportedly uses includes() to check whether postMessage originUrl contains dashboard.clevertap.com, allowing crafted subdomains to bypass the check. CVSS is 8.3 high: network-reachable, low complexity, no privileges required, user interaction required.
Likely exposure
Organizations embedding CleverTap Web SDK version 1.15.2 or earlier, especially where the Visual Builder module is present, should assess exposure. The CVE record’s affected product metadata is incomplete, but the description specifically names CleverTap Web SDK 1.15.2 and earlier.
Exploitation context
No CISA KEV listing is present in the provided data, and no cited source states active exploitation. The vulnerability requires user interaction and involves browser-side message handling, so risk is highest for sites where attacker-controlled pages or frames can influence users interacting with affected pages.
Researcher notes
Evidence points to DOM XSS through postMessage origin validation weakness. The public bundle identifies the vulnerable file and logic pattern, but does not provide a confirmed fixed version. Avoid assuming exploit availability or patch status beyond the linked issue and pull request.
Mitigation direction
- Inventory applications using CleverTap Web SDK and identify versions 1.15.2 or earlier.
- Check CleverTap issue #442 and PR #417 for vendor-confirmed remediation guidance.
- Upgrade only to a vendor-confirmed fixed release when available.
- If supported, reduce or disable Visual Builder usage until remediation is confirmed.
- Monitor vendor release notes for an official fixed version.
Validation and detection
- Confirm whether clevertap-web-sdk is present in web application dependencies or bundled assets.
- Verify deployed SDK versions and flag 1.15.2 or earlier.
- Review whether the Visual Builder module is included in production builds.
- Check source or bundled code for origin validation using includes() against dashboard.clevertap.com.
- Track CVE and GitHub references for fixed-version confirmation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-829: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-26862 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L2.85.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.3HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Inclusion of Functionality from Untrusted Control Sphere
Inclusion of Functionality from Untrusted Control Sphere represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.