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Fencer Intel
critical 9.8

CVE-2012-1495 in the critical feed json

install/index.php in WebCalendar before 1.2.5 allows remote attackers to execute arbitrary code via the form_single_user_login parameter.

published 2020-01-27 6 y ago modified 2026-06-16 4 mo ago also EUVD-2012-1513

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
79.8%
EPSS 79.8% chance of exploitation in 30 days, percentile 99.6%
public exploits
3
Metasploit, Exploit-DB

Summary

install/index.php in WebCalendar before 1.2.5 allows remote attackers to execute arbitrary code via the form_single_user_login parameter.

Patch / fix

  • webcalendar_project webcalendar 1.2.5

Timeline

  1. First public exploit (Metasploit exploit/linux/http/webcalendar_settings_exec)
  2. Published

Exploit prediction

79.76% chance of exploitation in the next 30 days, higher than 99.6% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • Metasploit exploit/linux/http/webcalendar_settings_exec WebCalendar 1.2.4 Pre-Auth Remote Code Injection metasploit exploit, excellent rank, 2012-04-23
  • EDB-18797 WebCalendar 1.2.4 - Remote Code Injection (Metasploit) webapps, 2012-04-29
  • EDB-18775 WebCalendar 1.2.4 - Remote Code Execution webapps, 2012-04-23
  • packetstormsecurity.com https://packetstormsecurity.com/files/112332/WebCalendar-1.2.4-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified
  • packetstormsecurity.com https://packetstormsecurity.com/files/112323/WebCalendar-1.2.4-Pre-Auth-Remote-Code-Injection.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

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.