# CVE-2026-87764: BuddyPress Instant Chat <= 1.6 - Unauthenticated Stored XSS via Chat Message

> Unauthenticated attackers can inject malicious scripts into chat messages, leading to code execution in victim sessions.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **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:** 11 Oct 2026
- **Updated:** 11 Oct 2026
- **Also known as:** GHSA-q3fq-h679-wfvh

## What is CVE-2026-87764?

CVE-2026-87764 is a high-severity cross-site scripting vulnerability in Unknown BuddyPress Instant Chat, published on 11 Oct 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

The BuddyPress Instant Chat WordPress plugin through 1.6 does not check that the sender of a chat message belongs to the conversation it is being added to, nor does it escape message content before outputting it back, allowing unauthenticated users to store arbitrary web scripts that will execute in the session of any member who later views that conversation.

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

## Which versions are affected by CVE-2026-87764?


## How do I fix CVE-2026-87764?

No fix has been published for CVE-2026-87764 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-87764 being exploited?

There is no known exploitation of CVE-2026-87764 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-87764 and fix it if it is affected.

What it is: CVE-2026-87764 is a high-severity cross-site scripting vulnerability in Unknown BuddyPress Instant Chat, published on 11 Oct 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-2026-87764 in the wild and no public exploit code.

Affected product: Unknown BuddyPress Instant Chat. 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-2026-87764/ (Markdown: https://insights.sbomify.com/CVE-2026-87764/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-87764
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-87764
- OSV: https://osv.dev/vulnerability/CVE-2026-87764

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-87764/
Summaries are generated and may contain mistakes; the official description above is the record.