CVE-2025-53371
📋 TL;DR
DiscordNotifications MediaWiki extension versions before commit 1f20d850cbcce5b15951c7c6127b87b927a5415e contain a Server-Side Request Forgery (SSRF) vulnerability that allows attackers to make arbitrary HTTP POST requests to internal systems. This could lead to denial of service (DoS) by reading large files or potentially remote code execution (RCE) if internal unprotected APIs are accessible. All MediaWiki installations using vulnerable DiscordNotifications versions are affected.
💻 Affected Systems
- DiscordNotifications MediaWiki extension
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution through SSRF to internal unprotected APIs, leading to complete system compromise.
Likely Case
Denial of service through resource exhaustion by forcing the server to read large files, potentially causing service disruption.
If Mitigated
Limited impact if proper network segmentation and API authentication are in place, though DoS risk remains.
🎯 Exploit Status
Exploitation requires knowledge of webhook URLs but no authentication to the MediaWiki instance.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Commit 1f20d850cbcce5b15951c7c6127b87b927a5415e
Vendor Advisory: https://github.com/miraheze/DiscordNotifications/security/advisories/GHSA-gvfx-p3h5-qf65
Restart Required: No
Instructions:
1. Update to the patched version via commit 1f20d850cbcce5b15951c7c6127b87b927a5415e. 2. Replace the DiscordNotifications extension files with the patched version. 3. Clear any caches if applicable.
🔧 Temporary Workarounds
Disable DiscordNotifications extension
allTemporarily disable the vulnerable extension until patching is possible.
Edit LocalSettings.php and comment out or remove: wfLoadExtension('DiscordNotifications');
Restrict webhook URL configurations
allLimit $wgDiscordIncomingWebhookUrl and $wgDiscordAdditionalIncomingWebhookUrls to trusted Discord endpoints only.
Edit LocalSettings.php and ensure webhook URLs point only to discord.com or discordapp.com domains.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate the MediaWiki server from internal APIs and sensitive systems.
- Deploy web application firewall (WAF) rules to block requests to internal IP ranges and large file reads.
🔍 How to Verify
Check if Vulnerable:
Check if DiscordNotifications extension is installed and if the version is before commit 1f20d850cbcce5b15951c7c6127b87b927a5415e.Check Version:
Check the extension's version in its extension.json file or via MediaWiki's Special:Version page.Verify Fix Applied:
Verify that the extension files match the patched commit hash 1f20d850cbcce5b15951c7c6127b927a5415e.📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP POST requests from the MediaWiki server to internal IPs or large file read operations.
Network Indicators:
- HTTP traffic from MediaWiki server to non-Discord endpoints or internal network segments.
SIEM Query:
source="mediawiki" AND (dest_ip NOT IN discord.com,discordapp.com) AND http_method="POST"