GHSA-c9vx-2g7w-rp65

### Description

The Export Chat feature includes certain attacker-controlled elements in the generated document without sufficient escaping, leading to stored XSS.

### Impact

Since the Export Chat feature generates a separate document, an attacker can only inject code run from the `null` origin, restricting the impact.

However, the attacker can still potentially use the XSS to leak message contents. A malicious homeserver is a potential attacker since the affected inputs are controllable server-side.

### Patches This was patched in matrix-react-sdk 3.76.0.

### Workarounds None, other than not using the Export Chat feature.

### References N/A