SSRF in Crawlseo
CVE-2026-115411
crawlseo before version 0.2.4 contains a server-side request forgery vulnerability in its crawler engine where isPrivateIp() fails to block reserved IP ranges such as RFC 6598 Carrier-Grade NAT, RFC 6890, TEST-NET ranges and certain IPv6 addresses, and additionally fails to pin the validated address for the actual outbound connection, allowing a TOCTOU DNS rebinding bypass. An authenticated attacker can add a malicious domain that resolves to an internal or restricted address, trigger a crawl to reach internal services or cloud metadata endpoints like 169.254.169.254, and retrieve the fetched page's title, description, headings, status code and links through the crawl results API, enabling internal network reconnaissance.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.0 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/crawlseo/crawlseo/commit/76e4e693de0c6b294cf1f60656800e47346f1c28 (issue-tracking)
- github.com/crawlseo/crawlseo/releases (patch)
- gist.github.com/mansurmavlankulov/47cb8e183fec39a7afe599d1082a3399 (technical-description)
- www.vulncheck.com/advisories/crawlseo-before-server-side-request-forgery-via-cr… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-115411?
- CVE-2026-115411 is a medium-severity vulnerability in Crawlseo, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.0/10. Published 2026-10-22.
- How severe is CVE-2026-115411?
- Medium severity. CVSS v3 base score is 5.0 out of 10.