What is CVE-2011-1133?

CVE-2011-1133 is a medium-severity vulnerability in S9y Serendipity, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-11-05.

How severe is CVE-2011-1133?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in S9y Serendipity

CVE-2011-1133

Cross-Site Scripting (XSS) in Xinha, as included in the Serendipity package before 1.5.5, allows remote attackers to execute arbitrary code via plugins/ExtendedFileManager/backend.php.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-11-05 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.018 (77.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

S9y Serendipity

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-tracker.debian.org/tracker/CVE-2011-1133 (Third Party Advisory, vdb-entry)
blog.s9y.org/archives/224-Important-Security-Update-Serendipity-1.5.5-released… (Release Notes, Vendor Advisory)
www.openwall.com/lists/oss-security/2011/03/02/5 (Mailing List, Third Party Advisory)
bugs.debian.org/cgi-bin/bugreport.cgi (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2011-1133?: CVE-2011-1133 is a medium-severity vulnerability in S9y Serendipity, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-11-05.
How severe is CVE-2011-1133?: Medium severity. CVSS v3 base score is 6.1 out of 10.