CVE-2026-26477: An issue in Dokuwiki v.2025-05-14b "Librarian" [56.2] allows a remote attacker to cause a denial of service vi

Routine

MEDIUM 4.3DOWNGRADE

CVE-2026-26477 is a medium-severity flaw (CVSS 4.3) affecting dokuwiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue in Dokuwiki v.2025-05-14b "Librarian" [56.2] allows a remote attacker to cause a denial of service via the media_upload_xhr() function in the media.php file

Why this priority

Public exploit reference

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

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 61%)
CISA exploited list	No
Weakness	CWE-770, CWE-400
Published	2026-04-03
Last modified	2026-07-24

Publisher (CNA): MITRE · Vendor: dokuwiki

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-03 15:16 UTCPublished CVE record published
2026-07-24 21:10 UTCUpdated Record last modified

dokuwiki dokuwiki DOWNGRADE

Affected: 2025-05-14b

Fixed in: no fixed release known

Safe to downgrade to: a release before 2025-05-14b

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2025-05-14b (Debian / Ubuntu)

apt-cache madison dokuwiki sudo apt install dokuwiki=<VERSION_BEFORE_2025-05-14b> sudo apt-mark hold dokuwiki

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

dnf --showduplicates list dokuwiki sudo dnf downgrade dokuwiki-<VERSION_BEFORE_2025-05-14b> sudo dnf versionlock add dokuwiki

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-2026-26477?

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

Is CVE-2026-26477 being exploited?

CVE-2026-26477 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-2026-26477 affect?

CVE-2026-26477 affects dokuwiki. Severity is medium (CVSS 4.3). An issue in Dokuwiki v.2025-05-14b "Librarian" [56.2] allows a remote attacker to cause a denial of service via the media_upload_xhr() function in the media.php file

How urgent is CVE-2026-26477?

Priority 30/100. Public exploit reference

Software pages

PHP vulnerabilities

References

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