CVE-2025-3636Network attack vector

RSS feed disclosure via unchecked record identifier

Published Apr 25, 2025 · Updated Apr 25, 2025

Authorization bypass in affected Moodle LMS releases allows remote authenticated users to read RSS feed content assigned to other users. The blocks/rss_client/viewfeed.php endpoint accepts a user-controlled rssid and previously loaded the matching block_rss_client record without restricting the query to feeds owned by or shared with that user. Any logged-in user who can reach the RSS client view can disclose only another valid feed record's content; no modification or service interruption is reported.

CVSS severity4.3
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in affected Moodle LMS releases allows remote authenticated users to read RSS feed content assigned to other users. The blocks/rss_client/viewfeed.php endpoint accepts a user-controlled rssid and previously loaded the matching block_rss_client record without restricting the query to feeds owned by or shared with that user. Any logged-in user who can reach the RSS client view can disclose only another valid feed record's content; no modification or service interruption is reported.

The record

CVE
CVE-2025-3636
Published
Apr 25, 2025
Updated
Apr 25, 2025
Vendor
Moodle
Product
Moodle LMS
Classifications
CWE-639, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 25, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.1.0 <4.1.18
  2. Affected versionversion=4.3.0 <4.3.12
  3. Affected versionversion=4.4.0 <4.4.8
  4. Affected versionversion=4.5.0 <4.5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Moodle · Moodle LMSversion=4.1.0 <4.1.18; version=4.3.0 <4.3.12; version=4.4.0 <4.4.8; version=4.5.0 <4.5.4

Published CVSS scores

4.3Fedora ProjectCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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