CVE-2026-120500: An Otter Wiki before 2.26.2 contains a stored cross-site scripting vulnerability in OtterwikiMdRenderer.block_

Routine

MEDIUM 6.1UPGRADE

CVE-2026-120500 is a medium-severity flaw (CVSS 6.1) affecting otterwiki. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Otter Wiki before 2.26.2 contains a stored cross-site scripting vulnerability in OtterwikiMdRenderer.block_code that allows attackers who can edit pages, including anonymous users under the default configuration, to inject arbitrary script. Attackers can place HTML inside a math fenced code block, which is rendered unescaped and executes for every viewer of the page.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-79
Published	2026-11-02
Last modified	2026-11-02

Publisher (CNA): VulnCheck · Vendor: redimp · Source: CVE Program record (NVD analysis pending)

Last updated 2026-11-02 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-11-02 15:31 UTCPublished CVE record published
2026-11-02 15:31 UTCUpdated Record last modified

redimp otterwiki UPGRADE

Affected: >= 2.0.0 and < 2.26.2

Fixed in: 2.26.2

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. UPGRADE to 2.26.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade otterwiki

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 2.0.0 (Debian / Ubuntu)

apt-cache madison otterwiki sudo apt install otterwiki=<VERSION_BEFORE_2.0.0> sudo apt-mark hold otterwiki

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

dnf --showduplicates list otterwiki sudo dnf downgrade otterwiki-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add otterwiki

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

VulDB Recent Entries: CVE-2026-120500 | redimp Otter Wiki up to 2.26.1 Markdown Renderer OtterwikiMdRenderer.block_code cross site scripting 2026-11-02

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-2026-120500?

otterwiki: upgrade to 2.26.2. Exact commands for each OS are on this page.

Is CVE-2026-120500 being exploited?

CVE-2026-120500 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-2026-120500 affect?

CVE-2026-120500 affects otterwiki. Severity is medium (CVSS 6.1). An Otter Wiki before 2.26.2 contains a stored cross-site scripting vulnerability in OtterwikiMdRenderer.block_code that allows attackers who can edit pages, including anonymous users under the default configuration, to inject arbitrary scri

How urgent is CVE-2026-120500?

Priority 21/100. No elevated risk signals yet.

Related CVEs

CVE-2026-120501 MEDIUM 5.3 UPGRADE An Otter Wiki 2.20.1 before 2.26.2 contains a file disclosure vulnerability in the DataTable embedding that al

References

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