# CVE-2026-20149: Cross-site scripting in Cisco Webex Meetings

> An unauthenticated remote attacker could execute cross-site scripting attacks against users via malicious links in Cisco Webex Meetings.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 4 Mar 2026
- **Updated:** 4 Mar 2026
- **Also known as:** GHSA-wgqr-v4gj-r4jj

## What is CVE-2026-20149?

CVE-2026-20149 is a medium-severity cross-site scripting vulnerability in Cisco Webex Meetings, published on 4 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability in Cisco Webex could have allowed an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack. Cisco has addressed this vulnerability, and no customer action is needed.

 This vulnerability was due to improper filtering of user-supplied input. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user to follow a malicious link. A successful exploit could have allowed the attacker to conduct an XSS attack against the targeted user.

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

## Which versions are affected by CVE-2026-20149?

It affects 1 product.


Products: Cisco Webex.

## How do I fix CVE-2026-20149?

No fix has been published for CVE-2026-20149 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-20149 being exploited?

There is no known exploitation of CVE-2026-20149 in the wild and no public exploit code.

## Other vulnerabilities in Cisco Webex Meetings

- [CVE-2009-2875](https://insights.sbomify.com/CVE-2009-2875/): Memory corruption in n/a (critical 9.3)
- [CVE-2009-2876](https://insights.sbomify.com/CVE-2009-2876/): Memory corruption in n/a (critical 9.3)
- [CVE-2009-2877](https://insights.sbomify.com/CVE-2009-2877/): Memory corruption in n/a (critical 9.3)
- [CVE-2009-2878](https://insights.sbomify.com/CVE-2009-2878/): Memory corruption in n/a (critical 9.3)
- [CVE-2009-2879](https://insights.sbomify.com/CVE-2009-2879/): Memory corruption in n/a (critical 9.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-20149 and fix it if it is affected.

What it is: CVE-2026-20149 is a medium-severity cross-site scripting vulnerability in Cisco Webex Meetings, published on 4 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-20149 in the wild and no public exploit code.

Affected product: Cisco Webex Meetings. 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-2026-20149/ (Markdown: https://insights.sbomify.com/CVE-2026-20149/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-20149
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-20149
- OSV: https://osv.dev/vulnerability/CVE-2026-20149

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-20149/
Summaries are generated and may contain mistakes; the official description above is the record.