CVE-2026-57940
CVE-2026-57940 is a low-severity vulnerability with a CVSS 4.0 base score of 2.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.
Key facts
- Severity: Low (CVSS 4.0 base score 2.1)
- EPSS exploit prediction: 0% (14th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-39660
- Weakness: CWE-918
- Published:
- Last modified:
Description
HTMLy 3.1.1 contains a Server-Side Request Forgery (SSRF) vulnerability in the RSS feed import functionality. The function get_feed() in system/admin/admin.php passes user-supplied $feed_url directly to file_get_contents() without any validation. An authenticated attacker with administrative privileges can exploit this by entering a crafted URL (e.g., http://dnslog.example.com, file:///etc/passwd, or http://169.254.169.254 in cloud contexts) via Tools -> Import RSS. The server will then make a request to the attacker-controlled target.
Frequently asked questions
- What is CVE-2026-57940?
- HTMLy 3.1.1 contains a Server-Side Request Forgery (SSRF) vulnerability in the RSS feed import functionality. The function get_feed() in system/admin/admin.php passes user-supplied $feed_url directly to file_get_contents() without any validation. An authenticated attacker with administrative privileges can exploit this by entering a crafted URL (e.g., http://dnslog.example.com, file:///etc/passwd, or http://169.254.169.254 in cloud contexts) via Tools -> Import RSS. The server will then make a request to the attacker-controlled target.
- How severe is CVE-2026-57940?
- CVE-2026-57940 has a CVSS 4.0 base score of 2.1, rated low severity.
- Is CVE-2026-57940 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-57940?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-57940 have an EU (EUVD) identifier?
- Yes. CVE-2026-57940 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39660.
- When was CVE-2026-57940 published?
- CVE-2026-57940 was published on 2026-06-26.
References
Other CWE-918 (Server-Side Request Forgery (SSRF)) vulnerabilities
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