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Fencer Intel
medium 4.3

CVE-2011-0526 json

Cross-site scripting (XSS) vulnerability in index.php in Vanilla Forums before 2.0.17 allows remote attackers to inject arbitrary web scrip…

published 2011-02-08 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-0546

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

Cross-site scripting (XSS) vulnerability in index.php in Vanilla Forums before 2.0.17 allows remote attackers to inject arbitrary web script or HTML via the Target parameter in a /entry/signin action.

Exploit prediction

1.27% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • osvdb.org http://www.osvdb.org/70677 referenced PoC, tagged "exploit" by a source, unverified
  • yehg.net http://yehg.net/lab/pr0js/advisories/%5Bvanilla_forums-2.0.16%5D_cross_site_scripting referenced PoC, tagged "exploit" by a source, unverified
  • openwall.com http://openwall.com/lists/oss-security/2011/01/27/2 referenced PoC, tagged "exploit" by a source, unverified
  • openwall.com http://openwall.com/lists/oss-security/2011/01/27/5 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.