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Fencer Intel
critical 9.8

CVE-2017-0356 json

Authentication bypass via repeated parameters

published 2018-04-13 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-0712

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.3%
EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

A flaw, similar to to CVE-2016-9646, exists in ikiwiki before 3.20170111, in the passwordauth plugin's use of CGI::FormBuilder, allowing an attacker to bypass authentication via repeated parameters.

Patch / fix

  • ikiwiki ikiwiki 3.20170111
  • ikiwiki Debian 14, Debian 13, Debian 12 3.20170111

debian advisories DEBIAN-CVE-2017-0356

  • ikiwiki openSUSE Tumbleweed 3.20200202.3-2.7

opensuse advisories openSUSE-SU-2024:10860-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-0356 updated cvss 6.5

ikiwiki: Authentication bypass via repeated parameters

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.28% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • marc.info https://marc.info/?l=oss-security&m=148418234314276&w=2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/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

Affected products

  • ikiwiki ikiwiki

Classification

Weakness

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.