CVE-2017-0356: A flaw, similar to to CVE-2016-9646, exists in ikiwiki before 3.20170111, in the passwordauth plugin's use of

Q: How do I fix CVE-2017-0356?

ikiwiki: upgrade to 3.20170111; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2017-0356 being exploited?

CVE-2017-0356 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2017-0356 affect?

CVE-2017-0356 affects ikiwiki, debian linux. Severity is critical (CVSS 9.8). 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.

Q: How urgent is CVE-2017-0356?

Priority 71/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2017-0356 is a critical-severity flaw (CVSS 9.8) affecting ikiwiki, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.3% (top 12%)
CISA exploited list	No
Weakness	CWE-287
Published	2018-04-13
Last modified	2026-06-17

Publisher (CNA): Debian GNU/Linux · Vendor: debian · ikiwiki

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-04-13 15:29 UTCPublished CVE record published
2026-06-17 00:57 UTCUpdated Record last modified

ikiwiki ikiwiki UPGRADE

Affected: < 3.20170111

Fixed in: 3.20170111

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ikiwiki || rpm -q ikiwiki || ikiwiki --version

2. UPGRADE to 3.20170111 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ikiwiki

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ikiwiki

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 7.0 · 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · shotcut · FIXED · 26.10.30-1.fc46 · FEDORA-2026-7787c7fc2d · source

sudo dnf upgrade --advisory=FEDORA-2026-7787c7fc2d

Ubuntu 20.04 · ikiwiki · NOT AFFECTED

Ubuntu 22.04 · ikiwiki · NOT AFFECTED

Ubuntu 24.04 · ikiwiki · NOT AFFECTED

Ubuntu 24.10 · ikiwiki · NOT AFFECTED

Ubuntu 25.04 · ikiwiki · NOT AFFECTED

Debian 12 · ikiwiki · FIXED · 3.20170111

sudo apt update && sudo apt install --only-upgrade ikiwiki dpkg --compare-versions "$(dpkg-query -W -f='${Version}' ikiwiki)" ge "3.20170111" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · ikiwiki · FIXED · 3.20170111

sudo apt update && sudo apt install --only-upgrade ikiwiki dpkg --compare-versions "$(dpkg-query -W -f='${Version}' ikiwiki)" ge "3.20170111" && echo PATCHED || echo STILL-VULNERABLE

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-0356?

ikiwiki: upgrade to 3.20170111; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-0356 being exploited?

CVE-2017-0356 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-0356 affect?

CVE-2017-0356 affects ikiwiki, debian linux. Severity is critical (CVSS 9.8). 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.

How urgent is CVE-2017-0356?

Priority 71/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2019-9187 HIGH 7.5 UPGRADE ikiwiki before 3.20170111.1 and 3.2018x and 3.2019x before 3.20190228 allows SSRF via the aggregate plugin
CVE-2016-9646 MEDIUM 5.3 UPGRADE MITIGATE ikiwiki before 3.20161229 incorrectly called the CGI::FormBuilder->field method (similar to the CGI->param API
CVE-2016-9645 MEDIUM 6.5 UPGRADE The fix for ikiwiki for CVE-2016-10026 was incomplete resulting in editing restriction bypass for git revert w
CVE-2016-10026 HIGH 7.5 DOWNGRADE ikiwiki 3.20161219 does not properly check if a revision changes the access permissions for a page on sites wi
CVE-2015-2793 MEDIUM 6.1 UPGRADE MITIGATE Cross-site scripting (XSS) vulnerability in templates/openid-selector.tmpl in ikiwiki before 3.20150329 allows

References

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