CVE-2025-8529: Cloudfavorites Favorites-Web SSRF Vulnerability

CVE-2025-8529 Overview

CVE-2025-8529 is a server-side request forgery (SSRF) vulnerability affecting cloudfavorites favorites-web versions up to 1.3.0. The flaw resides in the getCollectLogoUrl function within app/src/main/java/com/favorites/web/CollectController.java. An attacker can manipulate the url argument to coerce the application into issuing outbound HTTP requests to attacker-controlled or internal-only destinations. The vulnerability is remotely exploitable and requires low-privilege authentication. Public disclosure of the exploit details has occurred through VulDB and the project's GitHub issue tracker, increasing the risk of opportunistic scanning against exposed instances.

Critical Impact
Authenticated remote attackers can abuse the url parameter of getCollectLogoUrl to force the server to send arbitrary HTTP requests, potentially reaching internal network resources.

Affected Products

cloudfavorites favorites-web up to and including version 1.3.0
The CollectController component handling collection logo retrieval
Deployments exposing the favorites-web interface to untrusted networks

Discovery Timeline

2025-08-04 - CVE-2025-8529 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-8529

Vulnerability Analysis

The vulnerability is classified under CWE-918: Server-Side Request Forgery. The getCollectLogoUrl handler accepts a user-supplied URL and fetches its contents server-side, presumably to retrieve a favicon or logo image for a bookmarked link. Because the input is not validated against an allowlist of destinations or restricted to public IP ranges, an attacker can substitute internal hostnames, loopback addresses, or metadata service endpoints. The server then proxies the request on the attacker's behalf, returning or acting on data that would otherwise be unreachable from the public internet.

Root Cause

The root cause is the absence of URL validation and network egress controls in the getCollectLogoUrl method of CollectController.java. The function trusts the caller-provided url parameter and passes it directly to an outbound HTTP client. There is no scheme allowlist, host resolution check, or blocklist for private IP ranges such as 127.0.0.0/8, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, or cloud metadata endpoints like 169.254.169.254.

Attack Vector

Exploitation requires network access to the favorites-web application and low-privilege authenticated access. An attacker submits a crafted request to the endpoint served by getCollectLogoUrl, setting the url parameter to an internal-facing target. The server issues the outbound request, and depending on response handling, the attacker may enumerate internal services, retrieve cloud instance metadata, or interact with unauthenticated administrative interfaces on the internal network. Detailed reproduction steps are available in the GitHub Issue #134 and VulDB #318655 Details.

No verified exploit code is republished here; refer to the linked advisories for technical proof-of-concept details.

Detection Methods for CVE-2025-8529

Indicators of Compromise

Application logs showing requests to the collect logo endpoint containing url parameters that reference internal IP ranges, localhost, or cloud metadata hosts such as 169.254.169.254.
Outbound HTTP connections from the favorites-web application server to non-standard internal destinations or ports typically not associated with logo retrieval.
Anomalous spikes in requests to the getCollectLogoUrl endpoint from a single authenticated user account.

Detection Strategies

Inspect web server and application access logs for url parameter values that fail an allowlist check for public HTTP/HTTPS logo hosts.
Correlate authenticated user sessions against outbound network telemetry from the application host to identify SSRF-driven pivoting.
Deploy web application firewall (WAF) rules that block requests where the url parameter resolves to RFC1918, loopback, or link-local addresses.

Monitoring Recommendations

Monitor egress traffic from the favorites-web application host and alert on connections to internal subnets or cloud metadata endpoints.
Baseline the expected destinations of outbound requests initiated by the application and alert on deviations.
Retain access logs and network flow data long enough to reconstruct SSRF chains during incident response.

How to Mitigate CVE-2025-8529

Immediate Actions Required

Restrict access to the favorites-web application to trusted users until a fix is applied, since exploitation requires only low-privilege authentication.
Place the application behind a reverse proxy or WAF that filters outbound-fetch parameters and blocks internal IP targets.
Segment the application host so it cannot reach sensitive internal services or cloud metadata endpoints.

Patch Information

At the time of publication, no fixed release has been identified in the enriched CVE data. Track the upstream GitHub Issue #134 for patch availability and upgrade guidance from the cloudfavorites project maintainers.

Workarounds

Implement an allowlist in application code or an upstream proxy that permits only expected logo hosts and the http/https schemes.
Resolve user-supplied hostnames before fetching and reject any address falling in loopback, private, link-local, or reserved ranges.
Disable or remove the getCollectLogoUrl functionality if remote logo retrieval is not required for the deployment.

bash

# Example egress restriction using iptables to block the application host from reaching
# cloud metadata and private ranges (adjust interface and user as needed)
iptables -A OUTPUT -m owner --uid-owner favorites -d 169.254.169.254 -j REJECT
iptables -A OUTPUT -m owner --uid-owner favorites -d 10.0.0.0/8 -j REJECT
iptables -A OUTPUT -m owner --uid-owner favorites -d 172.16.0.0/12 -j REJECT
iptables -A OUTPUT -m owner --uid-owner favorites -d 192.168.0.0/16 -j REJECT
iptables -A OUTPUT -m owner --uid-owner favorites -d 127.0.0.0/8 -j REJECT