Authenticated internal service disclosure via unchecked link updates
Published Apr 7, 2026 · Updated Apr 7, 2026
SSRF in LinkAce before 2.5.4 allows remote authenticated users to read responses from internal services by updating a saved link. LinkRepository::update accepts a replacement URL without private-IP validation, leaving check_disabled false, and CheckLinksCommand::checkLink later issues an unfiltered server-side HEAD request. Exploitation requires a valid account and the scheduled links:check job; the resulting reachability oracle exposes internal service data, cloud metadata, credentials, and network topology.
Summary
What happened
SSRF in LinkAce before 2.5.4 allows remote authenticated users to read responses from internal services by updating a saved link. LinkRepository::update accepts a replacement URL without private-IP validation, leaving check_disabled false, and CheckLinksCommand::checkLink later issues an unfiltered server-side HEAD request. Exploitation requires a valid account and the scheduled links:check job; the resulting reachability oracle exposes internal service data, cloud metadata, credentials, and network topology.
The record
- CVE
- CVE-2026-35516
- Published
- Apr 7, 2026
- Updated
- Apr 7, 2026
- Vendor
- Kovah
- Product
- LinkAce
- Classifications
- CWE-918, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 7, 2026CVE publishedPublication date reported by the CVE source.
- Apr 7, 2026Record 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.
- Affected versionversion=< 2.5.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- GitHub advisory reproduction stepsproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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