CVE-2026-86738: Snipe-IT versions before 8.7.0 contain a CSS injection vulnerability in the Custom CSS field due to incomplete

This month

HIGH 8.7UPGRADE

CVE-2026-86738 is a high-severity flaw (CVSS 8.7) affecting snipe-it. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Snipe-IT versions before 8.7.0 contain a CSS injection vulnerability in the Custom CSS field due to incomplete sanitization that reverses HTML encoding on greater-than and double-quote characters. Superusers can plant malicious CSS payloads using @import and url() references to exfiltrate CSRF tokens from other superusers via attribute-selector rules, enabling account takeover.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-09-08
Last modified	2026-09-09

Publisher (CNA): VulnCheck · Vendor: snipeitapp

Last updated 2026-09-09 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-08 16:18 UTCPublished CVE record published
2026-09-09 13:06 UTCUpdated Record last modified

snipeitapp snipe-it UPGRADE

Affected: >= 3.0.0 and < 8.7.0

Fixed in: 8.7.0

Safe to downgrade to: a release before 3.0.0

1. Check installed version

apt-cache policy snipe-it || rpm -q snipe-it || snipe-it --version

2. UPGRADE to 8.7.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade snipe-it

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade snipe-it

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 snipe-it sudo apt install snipe-it=<VERSION_BEFORE_3.0.0> sudo apt-mark hold snipe-it

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

dnf --showduplicates list snipe-it sudo dnf downgrade snipe-it-<VERSION_BEFORE_3.0.0> sudo dnf versionlock add snipe-it

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-2026-86738?

snipe-it: upgrade to 8.7.0. Exact commands for each OS are on this page.

Is CVE-2026-86738 being exploited?

CVE-2026-86738 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-2026-86738 affect?

CVE-2026-86738 affects snipe-it. Severity is high (CVSS 8.7). Snipe-IT versions before 8.7.0 contain a CSS injection vulnerability in the Custom CSS field due to incomplete sanitization that reverses HTML encoding on greater-than and double-quote characters. Superusers can plant malicious CSS payloads

How urgent is CVE-2026-86738?

Priority 41/100. High severity

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References

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