CVE-2025-53371: miraheze DiscordNotifications · Uncontrolled Resource Consumption
Affects miraheze DiscordNotificationsSource CVE Database V5
Not known to be exploited · CVSS 9.1 Critical.
Data as of 26 Oct 2026, 10:12 UTC
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 32% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:HExploitation evidence
Disclosed: evidence found.
CVE published 10 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
AI-suggested
European organizations should promptly update the DiscordNotifications extension to the fixed version containing commit 1f20d850cbcce5b15951c7c6127b87b927a5415e. Until patching is possible, administrators should restrict or disable the use of $wgDiscordIncomingWebhookUrl and $wgDiscordAdditionalIncomingWebhookUrls to trusted, validated URLs only, preventing arbitrary URL requests. Network-level controls such as firewall rules or web application firewalls (WAF) should be configured to block outgoing HTTP requests to untrusted or internal IP ranges from the MediaWiki server to mitigate SSRF risks. Monitoring and alerting on unusual outbound HTTP requests from the MediaWiki server can help detect exploitation attempts. Additionally, internal APIs should be secured with authentication and network segmentation to reduce the impact of SSRF. Conducting a security review of internal services accessible via HTTP POST requests is recommended to identify and remediate potential RCE vectors. Regular vulnerability scanning and applying security best practices for MediaWiki deployments will further reduce risk.
Description
DiscordNotifications is an extension for MediaWiki that sends notifications of actions in your Wiki to a Discord channel. DiscordNotifications allows sending requests via curl and file_get_contents to arbitrary URLs set via $wgDiscordIncomingWebhookUrl and $wgDiscordAdditionalIncomingWebhookUrls. This allows for DOS by causing the server to read large files. SSRF is also possible if there are internal unprotected APIs that can be accessed using HTTP POST requests, which could also possibly lead to RCE. This vulnerability is fixed in commit 1f20d850cbcce5b15951c7c6127b87b927a5415e.