# CVE-2026-66779: Cross-Site Scripting (XSS) vulnerability in SAP NetWeaver Application Server ABAP

> An authenticated attacker can execute malicious scripts in a victim's browser via a crafted link, compromising confidentiality and integrity.

- **Severity:** Medium 6.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 11 Aug 2026
- **Updated:** 11 Aug 2026
- **Also known as:** GHSA-7p2q-g3fc-cm89

## What is CVE-2026-66779?

CVE-2026-66779 is a medium-severity cross-site scripting vulnerability in SAP_SE SAP NetWeaver Application Server ABAP, published on 11 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Due to a Cross-Site Scripting (XSS) vulnerability in SAP NetWeaver Application Server ABAP, an authenticated attacker could generate a malicious link and make it publicly accessible. If an authenticated victim accesses this link, the injected input is processed and reflected within the DOM on the client side during page rendering, resulting in the execution of malicious content in the victim's browser context. Successful exploitation could result in a high impact to the confidentiality and a low impact to the integrity of the system, while availability remains unaffected.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-66779?


## How do I fix CVE-2026-66779?

No fix has been published for CVE-2026-66779 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-66779 being exploited?

There is no known exploitation of CVE-2026-66779 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-66779 and fix it if it is affected.

What it is: CVE-2026-66779 is a medium-severity cross-site scripting vulnerability in SAP_SE SAP NetWeaver Application Server ABAP, published on 11 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-66779 in the wild and no public exploit code.

Affected product: SAP_SE SAP NetWeaver Application Server ABAP. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-66779/ (Markdown: https://insights.sbomify.com/CVE-2026-66779/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-66779
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-66779
- OSV: https://osv.dev/vulnerability/CVE-2026-66779

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-66779/
Summaries are generated and may contain mistakes; the official description above is the record.