CVE-2026-27210: Pannellum is a lightweight, free, and open source panorama viewer for the web

Routine

MEDIUM 6.1UPGRADE

CVE-2026-27210 is a medium-severity flaw (CVSS 6.1) affecting pannellum. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Pannellum is a lightweight, free, and open source panorama viewer for the web. In versions 3.5.0 through 2.5.6, the hot spot attributes configuration property allowed any attribute to be set, including HTML event handler attributes, allowing for potential XSS attacks. This affects websites hosting the standalone viewer HTML file and any other use of untrusted JSON config files (bypassing the protections of the escapeHTML parameter). As certain ev

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-02-21
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: pannellum

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

Am I affected?

Timeline

2026-02-21 06:17 UTCPublished CVE record published
2026-06-17 10:26 UTCUpdated Record last modified

pannellum pannellum UPGRADE

Affected: >= 2.5.0 and < 2.5.7

Fixed in: 2.5.7

Safe to downgrade to: a release before 2.5.0

1. Check installed version

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

2. UPGRADE to 2.5.7 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pannellum

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 2.5.0 (Debian / Ubuntu)

apt-cache madison pannellum sudo apt install pannellum=<VERSION_BEFORE_2.5.0> sudo apt-mark hold pannellum

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

dnf --showduplicates list pannellum sudo dnf downgrade pannellum-<VERSION_BEFORE_2.5.0> sudo dnf versionlock add pannellum

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-2026-27210?

pannellum: upgrade to 2.5.7. Exact commands for each OS are on this page.

Is CVE-2026-27210 being exploited?

CVE-2026-27210 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-2026-27210 affect?

CVE-2026-27210 affects pannellum. Severity is medium (CVSS 6.1). Pannellum is a lightweight, free, and open source panorama viewer for the web. In versions 3.5.0 through 2.5.6, the hot spot attributes configuration property allowed any attribute to be set, including HTML event handler attributes, allowin

How urgent is CVE-2026-27210?

Priority 29/100. No elevated risk signals yet.

References

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