CVE-2016-10026: ikiwiki 3.20161219 does not properly check if a revision changes the access permissions for a page on sites wi

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HIGH 7.5REMOTEDOWNGRADE

CVE-2016-10026 is a high-severity flaw (CVSS 7.5) affecting ikiwiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ikiwiki 3.20161219 does not properly check if a revision changes the access permissions for a page on sites with the git and recentchanges plugins and the CGI interface enabled, which allows remote attackers to revert certain changes by leveraging permissions to change the page before the revision was made.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Weakness	CWE-284
Published	2017-02-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ikiwiki

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

Am I affected?

Timeline

2017-02-13 18:59 UTCPublished CVE record published
2026-06-17 00:38 UTCUpdated Record last modified

ikiwiki ikiwiki DOWNGRADE

Affected: 3.20161219

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.20161219

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 3.20161219 (Debian / Ubuntu)

apt-cache madison ikiwiki sudo apt install ikiwiki=<VERSION_BEFORE_3.20161219> sudo apt-mark hold ikiwiki

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ikiwiki sudo dnf downgrade ikiwiki-<VERSION_BEFORE_3.20161219> sudo dnf versionlock add ikiwiki

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2016-10026?

ikiwiki: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-10026 being exploited?

CVE-2016-10026 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-2016-10026 affect?

CVE-2016-10026 affects ikiwiki. Severity is high (CVSS 7.5). ikiwiki 3.20161219 does not properly check if a revision changes the access permissions for a page on sites with the git and recentchanges plugins and the CGI interface enabled, which allows remote attackers to revert certain changes by lev

How urgent is CVE-2016-10026?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

Software pages

Git 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-2017-0356 CRITICAL 9.8 UPGRADE MITIGATE A flaw, similar to to CVE-2016-9646, exists in ikiwiki before 3.20170111, in the passwordauth plugin's use of
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-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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