CVE-2026-116890: Semantic MediaWiki from 3.0.0 before 7.3.0 contains a missing authorization vulnerability in the api.php smwta

This week

HIGH 7.3REMOTEUPGRADE

CVE-2026-116890 is a high-severity flaw (CVSS 7.3) affecting semantic mediawiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Semantic MediaWiki from 3.0.0 before 7.3.0 contains a missing authorization vulnerability in the api.php smwtask module that allows unauthenticated attackers to run admin-only maintenance tasks. Attackers can use the public anonymous CSRF token to read internal store statistics, enqueue jobs like smw.entityIdDisposer, and execute queued jobs, degrading performance and altering semantic data.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-10-27
Last modified	2026-11-03

Publisher (CNA): VulnCheck · Vendor: semantic-mediawiki

Last updated 2026-11-03 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-27 11:17 UTCPublished CVE record published
2026-11-03 16:23 UTCUpdated Record last modified

semantic-mediawiki semantic mediawiki UPGRADE

Affected: >= 3.0.0 and < 7.3.0

Fixed in: 7.3.0

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy semantic-mediawiki || rpm -q semantic-mediawiki || semantic-mediawiki --version

2. UPGRADE to 7.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade semantic-mediawiki

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade semantic-mediawiki

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.0.0 (Debian / Ubuntu)

apt-cache madison semantic-mediawiki sudo apt install semantic-mediawiki=<VERSION_BEFORE_3.0.0> sudo apt-mark hold semantic-mediawiki

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list semantic-mediawiki sudo dnf downgrade semantic-mediawiki-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add semantic-mediawiki

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.

Advisories and coverage

Research and news

Vulners Bulletins: CVE-2026-116890 2026-10-27

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-2026-116890?

semantic mediawiki: upgrade to 7.3.0. Exact commands for each OS are on this page.

Is CVE-2026-116890 being exploited?

CVE-2026-116890 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-2026-116890 affect?

CVE-2026-116890 affects semantic mediawiki. Severity is high (CVSS 7.3). Semantic MediaWiki from 3.0.0 before 7.3.0 contains a missing authorization vulnerability in the api.php smwtask module that allows unauthenticated attackers to run admin-only maintenance tasks. Attackers can use the public anonymous CSRF t

How urgent is CVE-2026-116890?

Priority 38/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

Related CVEs

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References

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